/*
* Performance counter core code
*
- * Copyright(C) 2008 Thomas Gleixner <tglx@linutronix.de>
- * Copyright(C) 2008 Red Hat, Inc., Ingo Molnar
+ * Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de>
+ * Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar
+ * Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
+ * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
*
- * For licencing details see kernel-base/COPYING
+ * For licensing details see kernel-base/COPYING
*/
#include <linux/fs.h>
+#include <linux/mm.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/file.h>
#include <linux/sysfs.h>
#include <linux/ptrace.h>
#include <linux/percpu.h>
+#include <linux/vmstat.h>
+#include <linux/hardirq.h>
+#include <linux/rculist.h>
#include <linux/uaccess.h>
#include <linux/syscalls.h>
#include <linux/anon_inodes.h>
#include <linux/kernel_stat.h>
#include <linux/perf_counter.h>
-#include <linux/mm.h>
-#include <linux/vmstat.h>
+#include <linux/dcache.h>
+
+#include <asm/irq_regs.h>
/*
* Each CPU has a list of per CPU counters:
static int perf_reserved_percpu __read_mostly;
static int perf_overcommit __read_mostly = 1;
+static atomic_t nr_mmap_tracking __read_mostly;
+static atomic_t nr_munmap_tracking __read_mostly;
+static atomic_t nr_comm_tracking __read_mostly;
+
+int sysctl_perf_counter_priv __read_mostly; /* do we need to be privileged */
+int sysctl_perf_counter_mlock __read_mostly = 128; /* 'free' kb per counter */
+
/*
- * Mutex for (sysadmin-configurable) counter reservations:
+ * Lock for (sysadmin-configurable) counter reservations:
*/
-static DEFINE_MUTEX(perf_resource_mutex);
+static DEFINE_SPINLOCK(perf_resource_lock);
/*
* Architecture provided APIs - weak aliases:
*/
-extern __weak const struct hw_perf_counter_ops *
-hw_perf_counter_init(struct perf_counter *counter)
+extern __weak const struct pmu *hw_perf_counter_init(struct perf_counter *counter)
{
return NULL;
}
*/
if (counter->group_leader == counter)
list_add_tail(&counter->list_entry, &ctx->counter_list);
- else
+ else {
list_add_tail(&counter->list_entry, &group_leader->sibling_list);
+ group_leader->nr_siblings++;
+ }
+
+ list_add_rcu(&counter->event_entry, &ctx->event_list);
}
static void
struct perf_counter *sibling, *tmp;
list_del_init(&counter->list_entry);
+ list_del_rcu(&counter->event_entry);
+
+ if (counter->group_leader != counter)
+ counter->group_leader->nr_siblings--;
/*
* If this was a group counter with sibling counters then
list_for_each_entry_safe(sibling, tmp,
&counter->sibling_list, list_entry) {
- list_del_init(&sibling->list_entry);
- list_add_tail(&sibling->list_entry, &ctx->counter_list);
+ list_move_tail(&sibling->list_entry, &ctx->counter_list);
sibling->group_leader = sibling;
}
}
return;
counter->state = PERF_COUNTER_STATE_INACTIVE;
- counter->hw_ops->disable(counter);
+ counter->tstamp_stopped = ctx->time;
+ counter->pmu->disable(counter);
counter->oncpu = -1;
if (!is_software_counter(counter))
if (ctx->task && cpuctx->task_ctx != ctx)
return;
- curr_rq_lock_irq_save(&flags);
- spin_lock(&ctx->lock);
+ spin_lock_irqsave(&ctx->lock, flags);
counter_sched_out(counter, cpuctx, ctx);
perf_max_counters - perf_reserved_percpu);
}
- spin_unlock(&ctx->lock);
- curr_rq_unlock_irq_restore(&flags);
+ spin_unlock_irqrestore(&ctx->lock, flags);
}
spin_unlock_irq(&ctx->lock);
}
+static inline u64 perf_clock(void)
+{
+ return cpu_clock(smp_processor_id());
+}
+
+/*
+ * Update the record of the current time in a context.
+ */
+static void update_context_time(struct perf_counter_context *ctx)
+{
+ u64 now = perf_clock();
+
+ ctx->time += now - ctx->timestamp;
+ ctx->timestamp = now;
+}
+
+/*
+ * Update the total_time_enabled and total_time_running fields for a counter.
+ */
+static void update_counter_times(struct perf_counter *counter)
+{
+ struct perf_counter_context *ctx = counter->ctx;
+ u64 run_end;
+
+ if (counter->state < PERF_COUNTER_STATE_INACTIVE)
+ return;
+
+ counter->total_time_enabled = ctx->time - counter->tstamp_enabled;
+
+ if (counter->state == PERF_COUNTER_STATE_INACTIVE)
+ run_end = counter->tstamp_stopped;
+ else
+ run_end = ctx->time;
+
+ counter->total_time_running = run_end - counter->tstamp_running;
+}
+
+/*
+ * Update total_time_enabled and total_time_running for all counters in a group.
+ */
+static void update_group_times(struct perf_counter *leader)
+{
+ struct perf_counter *counter;
+
+ update_counter_times(leader);
+ list_for_each_entry(counter, &leader->sibling_list, list_entry)
+ update_counter_times(counter);
+}
+
/*
* Cross CPU call to disable a performance counter
*/
if (ctx->task && cpuctx->task_ctx != ctx)
return;
- curr_rq_lock_irq_save(&flags);
- spin_lock(&ctx->lock);
+ spin_lock_irqsave(&ctx->lock, flags);
/*
* If the counter is on, turn it off.
* If it is in error state, leave it in error state.
*/
if (counter->state >= PERF_COUNTER_STATE_INACTIVE) {
+ update_context_time(ctx);
+ update_counter_times(counter);
if (counter == counter->group_leader)
group_sched_out(counter, cpuctx, ctx);
else
counter->state = PERF_COUNTER_STATE_OFF;
}
- spin_unlock(&ctx->lock);
- curr_rq_unlock_irq_restore(&flags);
+ spin_unlock_irqrestore(&ctx->lock, flags);
}
/*
* Since we have the lock this context can't be scheduled
* in, so we can change the state safely.
*/
- if (counter->state == PERF_COUNTER_STATE_INACTIVE)
+ if (counter->state == PERF_COUNTER_STATE_INACTIVE) {
+ update_counter_times(counter);
counter->state = PERF_COUNTER_STATE_OFF;
+ }
spin_unlock_irq(&ctx->lock);
}
*/
smp_wmb();
- if (counter->hw_ops->enable(counter)) {
+ if (counter->pmu->enable(counter)) {
counter->state = PERF_COUNTER_STATE_INACTIVE;
counter->oncpu = -1;
return -EAGAIN;
}
+ counter->tstamp_running += ctx->time - counter->tstamp_stopped;
+
if (!is_software_counter(counter))
cpuctx->active_oncpu++;
ctx->nr_active++;
if (!is_software_counter(leader))
return 0;
+
list_for_each_entry(counter, &leader->sibling_list, list_entry)
if (!is_software_counter(counter))
return 0;
+
return 1;
}
return can_add_hw;
}
+static void add_counter_to_ctx(struct perf_counter *counter,
+ struct perf_counter_context *ctx)
+{
+ list_add_counter(counter, ctx);
+ ctx->nr_counters++;
+ counter->prev_state = PERF_COUNTER_STATE_OFF;
+ counter->tstamp_enabled = ctx->time;
+ counter->tstamp_running = ctx->time;
+ counter->tstamp_stopped = ctx->time;
+}
+
/*
* Cross CPU call to install and enable a performance counter
*/
if (ctx->task && cpuctx->task_ctx != ctx)
return;
- curr_rq_lock_irq_save(&flags);
- spin_lock(&ctx->lock);
+ spin_lock_irqsave(&ctx->lock, flags);
+ update_context_time(ctx);
/*
* Protect the list operation against NMI by disabling the
*/
perf_flags = hw_perf_save_disable();
- list_add_counter(counter, ctx);
- ctx->nr_counters++;
+ add_counter_to_ctx(counter, ctx);
/*
* Don't put the counter on if it is disabled or if
*/
if (leader != counter)
group_sched_out(leader, cpuctx, ctx);
- if (leader->hw_event.pinned)
+ if (leader->hw_event.pinned) {
+ update_group_times(leader);
leader->state = PERF_COUNTER_STATE_ERROR;
+ }
}
if (!err && !ctx->task && cpuctx->max_pertask)
unlock:
hw_perf_restore(perf_flags);
- spin_unlock(&ctx->lock);
- curr_rq_unlock_irq_restore(&flags);
+ spin_unlock_irqrestore(&ctx->lock, flags);
}
/*
* can add the counter safely, if it the call above did not
* succeed.
*/
- if (list_empty(&counter->list_entry)) {
- list_add_counter(counter, ctx);
- ctx->nr_counters++;
- }
+ if (list_empty(&counter->list_entry))
+ add_counter_to_ctx(counter, ctx);
spin_unlock_irq(&ctx->lock);
}
if (ctx->task && cpuctx->task_ctx != ctx)
return;
- curr_rq_lock_irq_save(&flags);
- spin_lock(&ctx->lock);
+ spin_lock_irqsave(&ctx->lock, flags);
+ update_context_time(ctx);
+ counter->prev_state = counter->state;
if (counter->state >= PERF_COUNTER_STATE_INACTIVE)
goto unlock;
counter->state = PERF_COUNTER_STATE_INACTIVE;
+ counter->tstamp_enabled = ctx->time - counter->total_time_enabled;
/*
* If the counter is in a group and isn't the group leader,
*/
if (leader != counter)
group_sched_out(leader, cpuctx, ctx);
- if (leader->hw_event.pinned)
+ if (leader->hw_event.pinned) {
+ update_group_times(leader);
leader->state = PERF_COUNTER_STATE_ERROR;
+ }
}
unlock:
- spin_unlock(&ctx->lock);
- curr_rq_unlock_irq_restore(&flags);
+ spin_unlock_irqrestore(&ctx->lock, flags);
}
/*
* Since we have the lock this context can't be scheduled
* in, so we can change the state safely.
*/
- if (counter->state == PERF_COUNTER_STATE_OFF)
+ if (counter->state == PERF_COUNTER_STATE_OFF) {
counter->state = PERF_COUNTER_STATE_INACTIVE;
+ counter->tstamp_enabled =
+ ctx->time - counter->total_time_enabled;
+ }
out:
spin_unlock_irq(&ctx->lock);
}
+static void perf_counter_refresh(struct perf_counter *counter, int refresh)
+{
+ atomic_add(refresh, &counter->event_limit);
+ perf_counter_enable(counter);
+}
+
/*
* Enable a counter and all its children.
*/
ctx->is_active = 0;
if (likely(!ctx->nr_counters))
goto out;
+ update_context_time(ctx);
flags = hw_perf_save_disable();
if (ctx->nr_active) {
{
struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
struct perf_counter_context *ctx = &task->perf_counter_ctx;
+ struct pt_regs *regs;
if (likely(!cpuctx->task_ctx))
return;
+ update_context_time(ctx);
+
+ regs = task_pt_regs(task);
+ perf_swcounter_event(PERF_COUNT_CONTEXT_SWITCHES, 1, 1, regs, 0);
__perf_counter_sched_out(ctx, cpuctx);
cpuctx->task_ctx = NULL;
if (ret)
return ret < 0 ? ret : 0;
+ group_counter->prev_state = group_counter->state;
if (counter_sched_in(group_counter, cpuctx, ctx, cpu))
return -EAGAIN;
* Schedule in siblings as one group (if any):
*/
list_for_each_entry(counter, &group_counter->sibling_list, list_entry) {
+ counter->prev_state = counter->state;
if (counter_sched_in(counter, cpuctx, ctx, cpu)) {
partial_group = counter;
goto group_error;
if (likely(!ctx->nr_counters))
goto out;
+ ctx->timestamp = perf_clock();
+
flags = hw_perf_save_disable();
/*
* If this pinned group hasn't been scheduled,
* put it in error state.
*/
- if (counter->state == PERF_COUNTER_STATE_INACTIVE)
+ if (counter->state == PERF_COUNTER_STATE_INACTIVE) {
+ update_group_times(counter);
counter->state = PERF_COUNTER_STATE_ERROR;
+ }
}
list_for_each_entry(counter, &ctx->counter_list, list_entry) {
if (likely(!ctx->nr_counters))
return 0;
- curr_rq_lock_irq_save(&flags);
+ local_irq_save(flags);
cpu = smp_processor_id();
- /* force the update of the task clock: */
- __task_delta_exec(curr, 1);
-
perf_counter_task_sched_out(curr, cpu);
spin_lock(&ctx->lock);
perf_flags = hw_perf_save_disable();
list_for_each_entry(counter, &ctx->counter_list, list_entry) {
- if (counter->state != PERF_COUNTER_STATE_ERROR)
+ if (counter->state != PERF_COUNTER_STATE_ERROR) {
+ update_group_times(counter);
counter->state = PERF_COUNTER_STATE_OFF;
+ }
}
hw_perf_restore(perf_flags);
- spin_unlock(&ctx->lock);
-
- curr_rq_unlock_irq_restore(&flags);
+ spin_unlock_irqrestore(&ctx->lock, flags);
return 0;
}
if (likely(!ctx->nr_counters))
return 0;
- curr_rq_lock_irq_save(&flags);
+ local_irq_save(flags);
cpu = smp_processor_id();
- /* force the update of the task clock: */
- __task_delta_exec(curr, 1);
-
perf_counter_task_sched_out(curr, cpu);
spin_lock(&ctx->lock);
if (counter->state > PERF_COUNTER_STATE_OFF)
continue;
counter->state = PERF_COUNTER_STATE_INACTIVE;
+ counter->tstamp_enabled =
+ ctx->time - counter->total_time_enabled;
counter->hw_event.disabled = 0;
}
hw_perf_restore(perf_flags);
perf_counter_task_sched_in(curr, cpu);
- curr_rq_unlock_irq_restore(&flags);
+ local_irq_restore(flags);
return 0;
}
*/
perf_flags = hw_perf_save_disable();
list_for_each_entry(counter, &ctx->counter_list, list_entry) {
- list_del(&counter->list_entry);
- list_add_tail(&counter->list_entry, &ctx->counter_list);
+ list_move_tail(&counter->list_entry, &ctx->counter_list);
break;
}
hw_perf_restore(perf_flags);
{
struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
struct perf_counter_context *ctx = &curr->perf_counter_ctx;
- const int rotate_percpu = 0;
- if (rotate_percpu)
- perf_counter_cpu_sched_out(cpuctx);
+ perf_counter_cpu_sched_out(cpuctx);
perf_counter_task_sched_out(curr, cpu);
- if (rotate_percpu)
- rotate_ctx(&cpuctx->ctx);
+ rotate_ctx(&cpuctx->ctx);
rotate_ctx(ctx);
- if (rotate_percpu)
- perf_counter_cpu_sched_in(cpuctx, cpu);
+ perf_counter_cpu_sched_in(cpuctx, cpu);
perf_counter_task_sched_in(curr, cpu);
}
static void __read(void *info)
{
struct perf_counter *counter = info;
+ struct perf_counter_context *ctx = counter->ctx;
unsigned long flags;
- curr_rq_lock_irq_save(&flags);
- counter->hw_ops->read(counter);
- curr_rq_unlock_irq_restore(&flags);
+ local_irq_save(flags);
+ if (ctx->is_active)
+ update_context_time(ctx);
+ counter->pmu->read(counter);
+ update_counter_times(counter);
+ local_irq_restore(flags);
}
static u64 perf_counter_read(struct perf_counter *counter)
if (counter->state == PERF_COUNTER_STATE_ACTIVE) {
smp_call_function_single(counter->oncpu,
__read, counter, 1);
+ } else if (counter->state == PERF_COUNTER_STATE_INACTIVE) {
+ update_counter_times(counter);
}
return atomic64_read(&counter->count);
}
-/*
- * Cross CPU call to switch performance data pointers
- */
-static void __perf_switch_irq_data(void *info)
-{
- struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
- struct perf_counter *counter = info;
- struct perf_counter_context *ctx = counter->ctx;
- struct perf_data *oldirqdata = counter->irqdata;
-
- /*
- * If this is a task context, we need to check whether it is
- * the current task context of this cpu. If not it has been
- * scheduled out before the smp call arrived.
- */
- if (ctx->task) {
- if (cpuctx->task_ctx != ctx)
- return;
- spin_lock(&ctx->lock);
- }
-
- /* Change the pointer NMI safe */
- atomic_long_set((atomic_long_t *)&counter->irqdata,
- (unsigned long) counter->usrdata);
- counter->usrdata = oldirqdata;
-
- if (ctx->task)
- spin_unlock(&ctx->lock);
-}
-
-static struct perf_data *perf_switch_irq_data(struct perf_counter *counter)
-{
- struct perf_counter_context *ctx = counter->ctx;
- struct perf_data *oldirqdata = counter->irqdata;
- struct task_struct *task = ctx->task;
-
- if (!task) {
- smp_call_function_single(counter->cpu,
- __perf_switch_irq_data,
- counter, 1);
- return counter->usrdata;
- }
-
-retry:
- spin_lock_irq(&ctx->lock);
- if (counter->state != PERF_COUNTER_STATE_ACTIVE) {
- counter->irqdata = counter->usrdata;
- counter->usrdata = oldirqdata;
- spin_unlock_irq(&ctx->lock);
- return oldirqdata;
- }
- spin_unlock_irq(&ctx->lock);
- task_oncpu_function_call(task, __perf_switch_irq_data, counter);
- /* Might have failed, because task was scheduled out */
- if (counter->irqdata == oldirqdata)
- goto retry;
-
- return counter->usrdata;
-}
-
static void put_context(struct perf_counter_context *ctx)
{
if (ctx->task)
*/
if (cpu != -1) {
/* Must be root to operate on a CPU counter: */
- if (!capable(CAP_SYS_ADMIN))
+ if (sysctl_perf_counter_priv && !capable(CAP_SYS_ADMIN))
return ERR_PTR(-EACCES);
if (cpu < 0 || cpu > num_possible_cpus())
return ctx;
}
+static void free_counter_rcu(struct rcu_head *head)
+{
+ struct perf_counter *counter;
+
+ counter = container_of(head, struct perf_counter, rcu_head);
+ kfree(counter);
+}
+
+static void perf_pending_sync(struct perf_counter *counter);
+
+static void free_counter(struct perf_counter *counter)
+{
+ perf_pending_sync(counter);
+
+ if (counter->hw_event.mmap)
+ atomic_dec(&nr_mmap_tracking);
+ if (counter->hw_event.munmap)
+ atomic_dec(&nr_munmap_tracking);
+ if (counter->hw_event.comm)
+ atomic_dec(&nr_comm_tracking);
+
+ if (counter->destroy)
+ counter->destroy(counter);
+
+ call_rcu(&counter->rcu_head, free_counter_rcu);
+}
+
/*
* Called when the last reference to the file is gone.
*/
mutex_lock(&counter->mutex);
perf_counter_remove_from_context(counter);
- put_context(ctx);
mutex_unlock(&counter->mutex);
mutex_unlock(&ctx->mutex);
- kfree(counter);
+ free_counter(counter);
+ put_context(ctx);
return 0;
}
static ssize_t
perf_read_hw(struct perf_counter *counter, char __user *buf, size_t count)
{
- u64 cntval;
-
- if (count != sizeof(cntval))
- return -EINVAL;
+ u64 values[3];
+ int n;
/*
* Return end-of-file for a read on a counter that is in
return 0;
mutex_lock(&counter->mutex);
- cntval = perf_counter_read(counter);
+ values[0] = perf_counter_read(counter);
+ n = 1;
+ if (counter->hw_event.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
+ values[n++] = counter->total_time_enabled +
+ atomic64_read(&counter->child_total_time_enabled);
+ if (counter->hw_event.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
+ values[n++] = counter->total_time_running +
+ atomic64_read(&counter->child_total_time_running);
mutex_unlock(&counter->mutex);
- return put_user(cntval, (u64 __user *) buf) ? -EFAULT : sizeof(cntval);
-}
-
-static ssize_t
-perf_copy_usrdata(struct perf_data *usrdata, char __user *buf, size_t count)
-{
- if (!usrdata->len)
- return 0;
+ if (count < n * sizeof(u64))
+ return -EINVAL;
+ count = n * sizeof(u64);
- count = min(count, (size_t)usrdata->len);
- if (copy_to_user(buf, usrdata->data + usrdata->rd_idx, count))
+ if (copy_to_user(buf, values, count))
return -EFAULT;
- /* Adjust the counters */
- usrdata->len -= count;
- if (!usrdata->len)
- usrdata->rd_idx = 0;
- else
- usrdata->rd_idx += count;
-
return count;
}
-static ssize_t
-perf_read_irq_data(struct perf_counter *counter,
- char __user *buf,
- size_t count,
- int nonblocking)
-{
- struct perf_data *irqdata, *usrdata;
- DECLARE_WAITQUEUE(wait, current);
- ssize_t res, res2;
-
- irqdata = counter->irqdata;
- usrdata = counter->usrdata;
-
- if (usrdata->len + irqdata->len >= count)
- goto read_pending;
-
- if (nonblocking)
- return -EAGAIN;
-
- spin_lock_irq(&counter->waitq.lock);
- __add_wait_queue(&counter->waitq, &wait);
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (usrdata->len + irqdata->len >= count)
- break;
-
- if (signal_pending(current))
- break;
-
- if (counter->state == PERF_COUNTER_STATE_ERROR)
- break;
-
- spin_unlock_irq(&counter->waitq.lock);
- schedule();
- spin_lock_irq(&counter->waitq.lock);
- }
- __remove_wait_queue(&counter->waitq, &wait);
- __set_current_state(TASK_RUNNING);
- spin_unlock_irq(&counter->waitq.lock);
-
- if (usrdata->len + irqdata->len < count &&
- counter->state != PERF_COUNTER_STATE_ERROR)
- return -ERESTARTSYS;
-read_pending:
- mutex_lock(&counter->mutex);
-
- /* Drain pending data first: */
- res = perf_copy_usrdata(usrdata, buf, count);
- if (res < 0 || res == count)
- goto out;
-
- /* Switch irq buffer: */
- usrdata = perf_switch_irq_data(counter);
- res2 = perf_copy_usrdata(usrdata, buf + res, count - res);
- if (res2 < 0) {
- if (!res)
- res = -EFAULT;
- } else {
- res += res2;
- }
-out:
- mutex_unlock(&counter->mutex);
-
- return res;
-}
-
static ssize_t
perf_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
struct perf_counter *counter = file->private_data;
- switch (counter->hw_event.record_type) {
- case PERF_RECORD_SIMPLE:
- return perf_read_hw(counter, buf, count);
-
- case PERF_RECORD_IRQ:
- case PERF_RECORD_GROUP:
- return perf_read_irq_data(counter, buf, count,
- file->f_flags & O_NONBLOCK);
- }
- return -EINVAL;
+ return perf_read_hw(counter, buf, count);
}
static unsigned int perf_poll(struct file *file, poll_table *wait)
{
struct perf_counter *counter = file->private_data;
- unsigned int events = 0;
- unsigned long flags;
+ struct perf_mmap_data *data;
+ unsigned int events = POLL_HUP;
- poll_wait(file, &counter->waitq, wait);
+ rcu_read_lock();
+ data = rcu_dereference(counter->data);
+ if (data)
+ events = atomic_xchg(&data->poll, 0);
+ rcu_read_unlock();
- spin_lock_irqsave(&counter->waitq.lock, flags);
- if (counter->usrdata->len || counter->irqdata->len)
- events |= POLLIN;
- spin_unlock_irqrestore(&counter->waitq.lock, flags);
+ poll_wait(file, &counter->waitq, wait);
return events;
}
+static void perf_counter_reset(struct perf_counter *counter)
+{
+ atomic_set(&counter->count, 0);
+}
+
static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct perf_counter *counter = file->private_data;
case PERF_COUNTER_IOC_DISABLE:
perf_counter_disable_family(counter);
break;
+ case PERF_COUNTER_IOC_REFRESH:
+ perf_counter_refresh(counter, arg);
+ break;
+ case PERF_COUNTER_IOC_RESET:
+ perf_counter_reset(counter);
+ break;
default:
err = -ENOTTY;
}
return err;
}
-static const struct file_operations perf_fops = {
- .release = perf_release,
- .read = perf_read,
- .poll = perf_poll,
- .unlocked_ioctl = perf_ioctl,
- .compat_ioctl = perf_ioctl,
-};
-
-static int cpu_clock_perf_counter_enable(struct perf_counter *counter)
+/*
+ * Callers need to ensure there can be no nesting of this function, otherwise
+ * the seqlock logic goes bad. We can not serialize this because the arch
+ * code calls this from NMI context.
+ */
+void perf_counter_update_userpage(struct perf_counter *counter)
{
- int cpu = raw_smp_processor_id();
+ struct perf_mmap_data *data;
+ struct perf_counter_mmap_page *userpg;
- atomic64_set(&counter->hw.prev_count, cpu_clock(cpu));
- return 0;
-}
+ rcu_read_lock();
+ data = rcu_dereference(counter->data);
+ if (!data)
+ goto unlock;
-static void cpu_clock_perf_counter_update(struct perf_counter *counter)
-{
- int cpu = raw_smp_processor_id();
- s64 prev;
- u64 now;
+ userpg = data->user_page;
- now = cpu_clock(cpu);
- prev = atomic64_read(&counter->hw.prev_count);
- atomic64_set(&counter->hw.prev_count, now);
- atomic64_add(now - prev, &counter->count);
+ /*
+ * Disable preemption so as to not let the corresponding user-space
+ * spin too long if we get preempted.
+ */
+ preempt_disable();
+ ++userpg->lock;
+ barrier();
+ userpg->index = counter->hw.idx;
+ userpg->offset = atomic64_read(&counter->count);
+ if (counter->state == PERF_COUNTER_STATE_ACTIVE)
+ userpg->offset -= atomic64_read(&counter->hw.prev_count);
+
+ barrier();
+ ++userpg->lock;
+ preempt_enable();
+unlock:
+ rcu_read_unlock();
}
-static void cpu_clock_perf_counter_disable(struct perf_counter *counter)
+static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
- cpu_clock_perf_counter_update(counter);
-}
+ struct perf_counter *counter = vma->vm_file->private_data;
+ struct perf_mmap_data *data;
+ int ret = VM_FAULT_SIGBUS;
-static void cpu_clock_perf_counter_read(struct perf_counter *counter)
-{
- cpu_clock_perf_counter_update(counter);
-}
+ rcu_read_lock();
+ data = rcu_dereference(counter->data);
+ if (!data)
+ goto unlock;
-static const struct hw_perf_counter_ops perf_ops_cpu_clock = {
- .enable = cpu_clock_perf_counter_enable,
- .disable = cpu_clock_perf_counter_disable,
- .read = cpu_clock_perf_counter_read,
-};
+ if (vmf->pgoff == 0) {
+ vmf->page = virt_to_page(data->user_page);
+ } else {
+ int nr = vmf->pgoff - 1;
-/*
- * Called from within the scheduler:
- */
-static u64 task_clock_perf_counter_val(struct perf_counter *counter, int update)
-{
- struct task_struct *curr = counter->task;
- u64 delta;
+ if ((unsigned)nr > data->nr_pages)
+ goto unlock;
- delta = __task_delta_exec(curr, update);
+ vmf->page = virt_to_page(data->data_pages[nr]);
+ }
+ get_page(vmf->page);
+ ret = 0;
+unlock:
+ rcu_read_unlock();
- return curr->se.sum_exec_runtime + delta;
+ return ret;
}
-static void task_clock_perf_counter_update(struct perf_counter *counter, u64 now)
+static int perf_mmap_data_alloc(struct perf_counter *counter, int nr_pages)
{
- u64 prev;
- s64 delta;
+ struct perf_mmap_data *data;
+ unsigned long size;
+ int i;
- prev = atomic64_read(&counter->hw.prev_count);
+ WARN_ON(atomic_read(&counter->mmap_count));
- atomic64_set(&counter->hw.prev_count, now);
+ size = sizeof(struct perf_mmap_data);
+ size += nr_pages * sizeof(void *);
- delta = now - prev;
+ data = kzalloc(size, GFP_KERNEL);
+ if (!data)
+ goto fail;
- atomic64_add(delta, &counter->count);
+ data->user_page = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!data->user_page)
+ goto fail_user_page;
+
+ for (i = 0; i < nr_pages; i++) {
+ data->data_pages[i] = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!data->data_pages[i])
+ goto fail_data_pages;
+ }
+
+ data->nr_pages = nr_pages;
+ atomic_set(&data->lock, -1);
+
+ rcu_assign_pointer(counter->data, data);
+
+ return 0;
+
+fail_data_pages:
+ for (i--; i >= 0; i--)
+ free_page((unsigned long)data->data_pages[i]);
+
+ free_page((unsigned long)data->user_page);
+
+fail_user_page:
+ kfree(data);
+
+fail:
+ return -ENOMEM;
}
-static void task_clock_perf_counter_read(struct perf_counter *counter)
+static void __perf_mmap_data_free(struct rcu_head *rcu_head)
{
- u64 now = task_clock_perf_counter_val(counter, 1);
+ struct perf_mmap_data *data = container_of(rcu_head,
+ struct perf_mmap_data, rcu_head);
+ int i;
- task_clock_perf_counter_update(counter, now);
+ free_page((unsigned long)data->user_page);
+ for (i = 0; i < data->nr_pages; i++)
+ free_page((unsigned long)data->data_pages[i]);
+ kfree(data);
}
-static int task_clock_perf_counter_enable(struct perf_counter *counter)
+static void perf_mmap_data_free(struct perf_counter *counter)
{
- u64 now = task_clock_perf_counter_val(counter, 0);
+ struct perf_mmap_data *data = counter->data;
- atomic64_set(&counter->hw.prev_count, now);
+ WARN_ON(atomic_read(&counter->mmap_count));
- return 0;
+ rcu_assign_pointer(counter->data, NULL);
+ call_rcu(&data->rcu_head, __perf_mmap_data_free);
}
-static void task_clock_perf_counter_disable(struct perf_counter *counter)
+static void perf_mmap_open(struct vm_area_struct *vma)
{
- u64 now = task_clock_perf_counter_val(counter, 0);
+ struct perf_counter *counter = vma->vm_file->private_data;
- task_clock_perf_counter_update(counter, now);
+ atomic_inc(&counter->mmap_count);
}
-static const struct hw_perf_counter_ops perf_ops_task_clock = {
- .enable = task_clock_perf_counter_enable,
- .disable = task_clock_perf_counter_disable,
- .read = task_clock_perf_counter_read,
-};
+static void perf_mmap_close(struct vm_area_struct *vma)
+{
+ struct perf_counter *counter = vma->vm_file->private_data;
-#ifdef CONFIG_VM_EVENT_COUNTERS
-#define cpu_page_faults() __get_cpu_var(vm_event_states).event[PGFAULT]
-#else
-#define cpu_page_faults() 0
-#endif
+ if (atomic_dec_and_mutex_lock(&counter->mmap_count,
+ &counter->mmap_mutex)) {
+ vma->vm_mm->locked_vm -= counter->data->nr_locked;
+ perf_mmap_data_free(counter);
+ mutex_unlock(&counter->mmap_mutex);
+ }
+}
+
+static struct vm_operations_struct perf_mmap_vmops = {
+ .open = perf_mmap_open,
+ .close = perf_mmap_close,
+ .fault = perf_mmap_fault,
+};
+
+static int perf_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct perf_counter *counter = file->private_data;
+ unsigned long vma_size;
+ unsigned long nr_pages;
+ unsigned long locked, lock_limit;
+ int ret = 0;
+ long extra;
+
+ if (!(vma->vm_flags & VM_SHARED) || (vma->vm_flags & VM_WRITE))
+ return -EINVAL;
+
+ vma_size = vma->vm_end - vma->vm_start;
+ nr_pages = (vma_size / PAGE_SIZE) - 1;
+
+ /*
+ * If we have data pages ensure they're a power-of-two number, so we
+ * can do bitmasks instead of modulo.
+ */
+ if (nr_pages != 0 && !is_power_of_2(nr_pages))
+ return -EINVAL;
+
+ if (vma_size != PAGE_SIZE * (1 + nr_pages))
+ return -EINVAL;
+
+ if (vma->vm_pgoff != 0)
+ return -EINVAL;
+
+ mutex_lock(&counter->mmap_mutex);
+ if (atomic_inc_not_zero(&counter->mmap_count)) {
+ if (nr_pages != counter->data->nr_pages)
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ extra = nr_pages /* + 1 only account the data pages */;
+ extra -= sysctl_perf_counter_mlock >> (PAGE_SHIFT - 10);
+ if (extra < 0)
+ extra = 0;
+
+ locked = vma->vm_mm->locked_vm + extra;
+
+ lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur;
+ lock_limit >>= PAGE_SHIFT;
+
+ if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
+ ret = -EPERM;
+ goto unlock;
+ }
+
+ WARN_ON(counter->data);
+ ret = perf_mmap_data_alloc(counter, nr_pages);
+ if (ret)
+ goto unlock;
+
+ atomic_set(&counter->mmap_count, 1);
+ vma->vm_mm->locked_vm += extra;
+ counter->data->nr_locked = extra;
+unlock:
+ mutex_unlock(&counter->mmap_mutex);
+
+ vma->vm_flags &= ~VM_MAYWRITE;
+ vma->vm_flags |= VM_RESERVED;
+ vma->vm_ops = &perf_mmap_vmops;
+
+ return ret;
+}
+
+static int perf_fasync(int fd, struct file *filp, int on)
+{
+ struct perf_counter *counter = filp->private_data;
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ int retval;
+
+ mutex_lock(&inode->i_mutex);
+ retval = fasync_helper(fd, filp, on, &counter->fasync);
+ mutex_unlock(&inode->i_mutex);
+
+ if (retval < 0)
+ return retval;
+
+ return 0;
+}
+
+static const struct file_operations perf_fops = {
+ .release = perf_release,
+ .read = perf_read,
+ .poll = perf_poll,
+ .unlocked_ioctl = perf_ioctl,
+ .compat_ioctl = perf_ioctl,
+ .mmap = perf_mmap,
+ .fasync = perf_fasync,
+};
+
+/*
+ * Perf counter wakeup
+ *
+ * If there's data, ensure we set the poll() state and publish everything
+ * to user-space before waking everybody up.
+ */
+
+void perf_counter_wakeup(struct perf_counter *counter)
+{
+ wake_up_all(&counter->waitq);
+
+ if (counter->pending_kill) {
+ kill_fasync(&counter->fasync, SIGIO, counter->pending_kill);
+ counter->pending_kill = 0;
+ }
+}
+
+/*
+ * Pending wakeups
+ *
+ * Handle the case where we need to wakeup up from NMI (or rq->lock) context.
+ *
+ * The NMI bit means we cannot possibly take locks. Therefore, maintain a
+ * single linked list and use cmpxchg() to add entries lockless.
+ */
+
+static void perf_pending_counter(struct perf_pending_entry *entry)
+{
+ struct perf_counter *counter = container_of(entry,
+ struct perf_counter, pending);
+
+ if (counter->pending_disable) {
+ counter->pending_disable = 0;
+ perf_counter_disable(counter);
+ }
+
+ if (counter->pending_wakeup) {
+ counter->pending_wakeup = 0;
+ perf_counter_wakeup(counter);
+ }
+}
+
+#define PENDING_TAIL ((struct perf_pending_entry *)-1UL)
+
+static DEFINE_PER_CPU(struct perf_pending_entry *, perf_pending_head) = {
+ PENDING_TAIL,
+};
+
+static void perf_pending_queue(struct perf_pending_entry *entry,
+ void (*func)(struct perf_pending_entry *))
+{
+ struct perf_pending_entry **head;
+
+ if (cmpxchg(&entry->next, NULL, PENDING_TAIL) != NULL)
+ return;
+
+ entry->func = func;
+
+ head = &get_cpu_var(perf_pending_head);
+
+ do {
+ entry->next = *head;
+ } while (cmpxchg(head, entry->next, entry) != entry->next);
+
+ set_perf_counter_pending();
+
+ put_cpu_var(perf_pending_head);
+}
+
+static int __perf_pending_run(void)
+{
+ struct perf_pending_entry *list;
+ int nr = 0;
+
+ list = xchg(&__get_cpu_var(perf_pending_head), PENDING_TAIL);
+ while (list != PENDING_TAIL) {
+ void (*func)(struct perf_pending_entry *);
+ struct perf_pending_entry *entry = list;
+
+ list = list->next;
+
+ func = entry->func;
+ entry->next = NULL;
+ /*
+ * Ensure we observe the unqueue before we issue the wakeup,
+ * so that we won't be waiting forever.
+ * -- see perf_not_pending().
+ */
+ smp_wmb();
+
+ func(entry);
+ nr++;
+ }
+
+ return nr;
+}
+
+static inline int perf_not_pending(struct perf_counter *counter)
+{
+ /*
+ * If we flush on whatever cpu we run, there is a chance we don't
+ * need to wait.
+ */
+ get_cpu();
+ __perf_pending_run();
+ put_cpu();
+
+ /*
+ * Ensure we see the proper queue state before going to sleep
+ * so that we do not miss the wakeup. -- see perf_pending_handle()
+ */
+ smp_rmb();
+ return counter->pending.next == NULL;
+}
+
+static void perf_pending_sync(struct perf_counter *counter)
+{
+ wait_event(counter->waitq, perf_not_pending(counter));
+}
+
+void perf_counter_do_pending(void)
+{
+ __perf_pending_run();
+}
+
+/*
+ * Callchain support -- arch specific
+ */
+
+__weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
+{
+ return NULL;
+}
+
+/*
+ * Output
+ */
+
+struct perf_output_handle {
+ struct perf_counter *counter;
+ struct perf_mmap_data *data;
+ unsigned int offset;
+ unsigned int head;
+ int nmi;
+ int overflow;
+ int locked;
+ unsigned long flags;
+};
+
+static void perf_output_wakeup(struct perf_output_handle *handle)
+{
+ atomic_set(&handle->data->poll, POLL_IN);
+
+ if (handle->nmi) {
+ handle->counter->pending_wakeup = 1;
+ perf_pending_queue(&handle->counter->pending,
+ perf_pending_counter);
+ } else
+ perf_counter_wakeup(handle->counter);
+}
+
+/*
+ * Curious locking construct.
+ *
+ * We need to ensure a later event doesn't publish a head when a former
+ * event isn't done writing. However since we need to deal with NMIs we
+ * cannot fully serialize things.
+ *
+ * What we do is serialize between CPUs so we only have to deal with NMI
+ * nesting on a single CPU.
+ *
+ * We only publish the head (and generate a wakeup) when the outer-most
+ * event completes.
+ */
+static void perf_output_lock(struct perf_output_handle *handle)
+{
+ struct perf_mmap_data *data = handle->data;
+ int cpu;
+
+ handle->locked = 0;
+
+ local_irq_save(handle->flags);
+ cpu = smp_processor_id();
+
+ if (in_nmi() && atomic_read(&data->lock) == cpu)
+ return;
+
+ while (atomic_cmpxchg(&data->lock, -1, cpu) != -1)
+ cpu_relax();
+
+ handle->locked = 1;
+}
+
+static void perf_output_unlock(struct perf_output_handle *handle)
+{
+ struct perf_mmap_data *data = handle->data;
+ int head, cpu;
+
+ data->done_head = data->head;
+
+ if (!handle->locked)
+ goto out;
+
+again:
+ /*
+ * The xchg implies a full barrier that ensures all writes are done
+ * before we publish the new head, matched by a rmb() in userspace when
+ * reading this position.
+ */
+ while ((head = atomic_xchg(&data->done_head, 0)))
+ data->user_page->data_head = head;
+
+ /*
+ * NMI can happen here, which means we can miss a done_head update.
+ */
+
+ cpu = atomic_xchg(&data->lock, -1);
+ WARN_ON_ONCE(cpu != smp_processor_id());
+
+ /*
+ * Therefore we have to validate we did not indeed do so.
+ */
+ if (unlikely(atomic_read(&data->done_head))) {
+ /*
+ * Since we had it locked, we can lock it again.
+ */
+ while (atomic_cmpxchg(&data->lock, -1, cpu) != -1)
+ cpu_relax();
+
+ goto again;
+ }
+
+ if (atomic_xchg(&data->wakeup, 0))
+ perf_output_wakeup(handle);
+out:
+ local_irq_restore(handle->flags);
+}
+
+static int perf_output_begin(struct perf_output_handle *handle,
+ struct perf_counter *counter, unsigned int size,
+ int nmi, int overflow)
+{
+ struct perf_mmap_data *data;
+ unsigned int offset, head;
+
+ rcu_read_lock();
+ data = rcu_dereference(counter->data);
+ if (!data)
+ goto out;
+
+ handle->data = data;
+ handle->counter = counter;
+ handle->nmi = nmi;
+ handle->overflow = overflow;
+
+ if (!data->nr_pages)
+ goto fail;
+
+ perf_output_lock(handle);
+
+ do {
+ offset = head = atomic_read(&data->head);
+ head += size;
+ } while (atomic_cmpxchg(&data->head, offset, head) != offset);
+
+ handle->offset = offset;
+ handle->head = head;
+
+ if ((offset >> PAGE_SHIFT) != (head >> PAGE_SHIFT))
+ atomic_set(&data->wakeup, 1);
+
+ return 0;
+
+fail:
+ perf_output_wakeup(handle);
+out:
+ rcu_read_unlock();
+
+ return -ENOSPC;
+}
+
+static void perf_output_copy(struct perf_output_handle *handle,
+ void *buf, unsigned int len)
+{
+ unsigned int pages_mask;
+ unsigned int offset;
+ unsigned int size;
+ void **pages;
+
+ offset = handle->offset;
+ pages_mask = handle->data->nr_pages - 1;
+ pages = handle->data->data_pages;
+
+ do {
+ unsigned int page_offset;
+ int nr;
+
+ nr = (offset >> PAGE_SHIFT) & pages_mask;
+ page_offset = offset & (PAGE_SIZE - 1);
+ size = min_t(unsigned int, PAGE_SIZE - page_offset, len);
+
+ memcpy(pages[nr] + page_offset, buf, size);
+
+ len -= size;
+ buf += size;
+ offset += size;
+ } while (len);
+
+ handle->offset = offset;
+
+ WARN_ON_ONCE(handle->offset > handle->head);
+}
+
+#define perf_output_put(handle, x) \
+ perf_output_copy((handle), &(x), sizeof(x))
+
+static void perf_output_end(struct perf_output_handle *handle)
+{
+ struct perf_counter *counter = handle->counter;
+ struct perf_mmap_data *data = handle->data;
+
+ int wakeup_events = counter->hw_event.wakeup_events;
+
+ if (handle->overflow && wakeup_events) {
+ int events = atomic_inc_return(&data->events);
+ if (events >= wakeup_events) {
+ atomic_sub(wakeup_events, &data->events);
+ atomic_set(&data->wakeup, 1);
+ }
+ }
+
+ perf_output_unlock(handle);
+ rcu_read_unlock();
+}
+
+static void perf_counter_output(struct perf_counter *counter,
+ int nmi, struct pt_regs *regs, u64 addr)
+{
+ int ret;
+ u64 record_type = counter->hw_event.record_type;
+ struct perf_output_handle handle;
+ struct perf_event_header header;
+ u64 ip;
+ struct {
+ u32 pid, tid;
+ } tid_entry;
+ struct {
+ u64 event;
+ u64 counter;
+ } group_entry;
+ struct perf_callchain_entry *callchain = NULL;
+ int callchain_size = 0;
+ u64 time;
+
+ header.type = 0;
+ header.size = sizeof(header);
+
+ header.misc = PERF_EVENT_MISC_OVERFLOW;
+ header.misc |= user_mode(regs) ?
+ PERF_EVENT_MISC_USER : PERF_EVENT_MISC_KERNEL;
+
+ if (record_type & PERF_RECORD_IP) {
+ ip = instruction_pointer(regs);
+ header.type |= PERF_RECORD_IP;
+ header.size += sizeof(ip);
+ }
+
+ if (record_type & PERF_RECORD_TID) {
+ /* namespace issues */
+ tid_entry.pid = current->group_leader->pid;
+ tid_entry.tid = current->pid;
+
+ header.type |= PERF_RECORD_TID;
+ header.size += sizeof(tid_entry);
+ }
+
+ if (record_type & PERF_RECORD_TIME) {
+ /*
+ * Maybe do better on x86 and provide cpu_clock_nmi()
+ */
+ time = sched_clock();
+
+ header.type |= PERF_RECORD_TIME;
+ header.size += sizeof(u64);
+ }
+
+ if (record_type & PERF_RECORD_ADDR) {
+ header.type |= PERF_RECORD_ADDR;
+ header.size += sizeof(u64);
+ }
+
+ if (record_type & PERF_RECORD_GROUP) {
+ header.type |= PERF_RECORD_GROUP;
+ header.size += sizeof(u64) +
+ counter->nr_siblings * sizeof(group_entry);
+ }
+
+ if (record_type & PERF_RECORD_CALLCHAIN) {
+ callchain = perf_callchain(regs);
+
+ if (callchain) {
+ callchain_size = (1 + callchain->nr) * sizeof(u64);
+
+ header.type |= PERF_RECORD_CALLCHAIN;
+ header.size += callchain_size;
+ }
+ }
+
+ ret = perf_output_begin(&handle, counter, header.size, nmi, 1);
+ if (ret)
+ return;
+
+ perf_output_put(&handle, header);
+
+ if (record_type & PERF_RECORD_IP)
+ perf_output_put(&handle, ip);
+
+ if (record_type & PERF_RECORD_TID)
+ perf_output_put(&handle, tid_entry);
+
+ if (record_type & PERF_RECORD_TIME)
+ perf_output_put(&handle, time);
+
+ if (record_type & PERF_RECORD_ADDR)
+ perf_output_put(&handle, addr);
+
+ if (record_type & PERF_RECORD_GROUP) {
+ struct perf_counter *leader, *sub;
+ u64 nr = counter->nr_siblings;
+
+ perf_output_put(&handle, nr);
+
+ leader = counter->group_leader;
+ list_for_each_entry(sub, &leader->sibling_list, list_entry) {
+ if (sub != counter)
+ sub->pmu->read(sub);
+
+ group_entry.event = sub->hw_event.config;
+ group_entry.counter = atomic64_read(&sub->count);
+
+ perf_output_put(&handle, group_entry);
+ }
+ }
+
+ if (callchain)
+ perf_output_copy(&handle, callchain, callchain_size);
+
+ perf_output_end(&handle);
+}
+
+/*
+ * comm tracking
+ */
+
+struct perf_comm_event {
+ struct task_struct *task;
+ char *comm;
+ int comm_size;
+
+ struct {
+ struct perf_event_header header;
+
+ u32 pid;
+ u32 tid;
+ } event;
+};
+
+static void perf_counter_comm_output(struct perf_counter *counter,
+ struct perf_comm_event *comm_event)
+{
+ struct perf_output_handle handle;
+ int size = comm_event->event.header.size;
+ int ret = perf_output_begin(&handle, counter, size, 0, 0);
+
+ if (ret)
+ return;
+
+ perf_output_put(&handle, comm_event->event);
+ perf_output_copy(&handle, comm_event->comm,
+ comm_event->comm_size);
+ perf_output_end(&handle);
+}
+
+static int perf_counter_comm_match(struct perf_counter *counter,
+ struct perf_comm_event *comm_event)
+{
+ if (counter->hw_event.comm &&
+ comm_event->event.header.type == PERF_EVENT_COMM)
+ return 1;
+
+ return 0;
+}
+
+static void perf_counter_comm_ctx(struct perf_counter_context *ctx,
+ struct perf_comm_event *comm_event)
+{
+ struct perf_counter *counter;
+
+ if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
+ return;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
+ if (perf_counter_comm_match(counter, comm_event))
+ perf_counter_comm_output(counter, comm_event);
+ }
+ rcu_read_unlock();
+}
+
+static void perf_counter_comm_event(struct perf_comm_event *comm_event)
+{
+ struct perf_cpu_context *cpuctx;
+ unsigned int size;
+ char *comm = comm_event->task->comm;
+
+ size = ALIGN(strlen(comm)+1, sizeof(u64));
+
+ comm_event->comm = comm;
+ comm_event->comm_size = size;
+
+ comm_event->event.header.size = sizeof(comm_event->event) + size;
+
+ cpuctx = &get_cpu_var(perf_cpu_context);
+ perf_counter_comm_ctx(&cpuctx->ctx, comm_event);
+ put_cpu_var(perf_cpu_context);
+
+ perf_counter_comm_ctx(¤t->perf_counter_ctx, comm_event);
+}
+
+void perf_counter_comm(struct task_struct *task)
+{
+ struct perf_comm_event comm_event;
+
+ if (!atomic_read(&nr_comm_tracking))
+ return;
+
+ comm_event = (struct perf_comm_event){
+ .task = task,
+ .event = {
+ .header = { .type = PERF_EVENT_COMM, },
+ .pid = task->group_leader->pid,
+ .tid = task->pid,
+ },
+ };
+
+ perf_counter_comm_event(&comm_event);
+}
+
+/*
+ * mmap tracking
+ */
+
+struct perf_mmap_event {
+ struct file *file;
+ char *file_name;
+ int file_size;
+
+ struct {
+ struct perf_event_header header;
+
+ u32 pid;
+ u32 tid;
+ u64 start;
+ u64 len;
+ u64 pgoff;
+ } event;
+};
+
+static void perf_counter_mmap_output(struct perf_counter *counter,
+ struct perf_mmap_event *mmap_event)
+{
+ struct perf_output_handle handle;
+ int size = mmap_event->event.header.size;
+ int ret = perf_output_begin(&handle, counter, size, 0, 0);
+
+ if (ret)
+ return;
+
+ perf_output_put(&handle, mmap_event->event);
+ perf_output_copy(&handle, mmap_event->file_name,
+ mmap_event->file_size);
+ perf_output_end(&handle);
+}
-static u64 get_page_faults(struct perf_counter *counter)
+static int perf_counter_mmap_match(struct perf_counter *counter,
+ struct perf_mmap_event *mmap_event)
{
- struct task_struct *curr = counter->ctx->task;
+ if (counter->hw_event.mmap &&
+ mmap_event->event.header.type == PERF_EVENT_MMAP)
+ return 1;
- if (curr)
- return curr->maj_flt + curr->min_flt;
- return cpu_page_faults();
+ if (counter->hw_event.munmap &&
+ mmap_event->event.header.type == PERF_EVENT_MUNMAP)
+ return 1;
+
+ return 0;
+}
+
+static void perf_counter_mmap_ctx(struct perf_counter_context *ctx,
+ struct perf_mmap_event *mmap_event)
+{
+ struct perf_counter *counter;
+
+ if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
+ return;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
+ if (perf_counter_mmap_match(counter, mmap_event))
+ perf_counter_mmap_output(counter, mmap_event);
+ }
+ rcu_read_unlock();
+}
+
+static void perf_counter_mmap_event(struct perf_mmap_event *mmap_event)
+{
+ struct perf_cpu_context *cpuctx;
+ struct file *file = mmap_event->file;
+ unsigned int size;
+ char tmp[16];
+ char *buf = NULL;
+ char *name;
+
+ if (file) {
+ buf = kzalloc(PATH_MAX, GFP_KERNEL);
+ if (!buf) {
+ name = strncpy(tmp, "//enomem", sizeof(tmp));
+ goto got_name;
+ }
+ name = d_path(&file->f_path, buf, PATH_MAX);
+ if (IS_ERR(name)) {
+ name = strncpy(tmp, "//toolong", sizeof(tmp));
+ goto got_name;
+ }
+ } else {
+ name = strncpy(tmp, "//anon", sizeof(tmp));
+ goto got_name;
+ }
+
+got_name:
+ size = ALIGN(strlen(name)+1, sizeof(u64));
+
+ mmap_event->file_name = name;
+ mmap_event->file_size = size;
+
+ mmap_event->event.header.size = sizeof(mmap_event->event) + size;
+
+ cpuctx = &get_cpu_var(perf_cpu_context);
+ perf_counter_mmap_ctx(&cpuctx->ctx, mmap_event);
+ put_cpu_var(perf_cpu_context);
+
+ perf_counter_mmap_ctx(¤t->perf_counter_ctx, mmap_event);
+
+ kfree(buf);
+}
+
+void perf_counter_mmap(unsigned long addr, unsigned long len,
+ unsigned long pgoff, struct file *file)
+{
+ struct perf_mmap_event mmap_event;
+
+ if (!atomic_read(&nr_mmap_tracking))
+ return;
+
+ mmap_event = (struct perf_mmap_event){
+ .file = file,
+ .event = {
+ .header = { .type = PERF_EVENT_MMAP, },
+ .pid = current->group_leader->pid,
+ .tid = current->pid,
+ .start = addr,
+ .len = len,
+ .pgoff = pgoff,
+ },
+ };
+
+ perf_counter_mmap_event(&mmap_event);
+}
+
+void perf_counter_munmap(unsigned long addr, unsigned long len,
+ unsigned long pgoff, struct file *file)
+{
+ struct perf_mmap_event mmap_event;
+
+ if (!atomic_read(&nr_munmap_tracking))
+ return;
+
+ mmap_event = (struct perf_mmap_event){
+ .file = file,
+ .event = {
+ .header = { .type = PERF_EVENT_MUNMAP, },
+ .pid = current->group_leader->pid,
+ .tid = current->pid,
+ .start = addr,
+ .len = len,
+ .pgoff = pgoff,
+ },
+ };
+
+ perf_counter_mmap_event(&mmap_event);
+}
+
+/*
+ * Generic counter overflow handling.
+ */
+
+int perf_counter_overflow(struct perf_counter *counter,
+ int nmi, struct pt_regs *regs, u64 addr)
+{
+ int events = atomic_read(&counter->event_limit);
+ int ret = 0;
+
+ counter->pending_kill = POLL_IN;
+ if (events && atomic_dec_and_test(&counter->event_limit)) {
+ ret = 1;
+ counter->pending_kill = POLL_HUP;
+ if (nmi) {
+ counter->pending_disable = 1;
+ perf_pending_queue(&counter->pending,
+ perf_pending_counter);
+ } else
+ perf_counter_disable(counter);
+ }
+
+ perf_counter_output(counter, nmi, regs, addr);
+ return ret;
}
-static void page_faults_perf_counter_update(struct perf_counter *counter)
+/*
+ * Generic software counter infrastructure
+ */
+
+static void perf_swcounter_update(struct perf_counter *counter)
{
+ struct hw_perf_counter *hwc = &counter->hw;
u64 prev, now;
s64 delta;
- prev = atomic64_read(&counter->hw.prev_count);
- now = get_page_faults(counter);
-
- atomic64_set(&counter->hw.prev_count, now);
+again:
+ prev = atomic64_read(&hwc->prev_count);
+ now = atomic64_read(&hwc->count);
+ if (atomic64_cmpxchg(&hwc->prev_count, prev, now) != prev)
+ goto again;
delta = now - prev;
atomic64_add(delta, &counter->count);
+ atomic64_sub(delta, &hwc->period_left);
+}
+
+static void perf_swcounter_set_period(struct perf_counter *counter)
+{
+ struct hw_perf_counter *hwc = &counter->hw;
+ s64 left = atomic64_read(&hwc->period_left);
+ s64 period = hwc->irq_period;
+
+ if (unlikely(left <= -period)) {
+ left = period;
+ atomic64_set(&hwc->period_left, left);
+ }
+
+ if (unlikely(left <= 0)) {
+ left += period;
+ atomic64_add(period, &hwc->period_left);
+ }
+
+ atomic64_set(&hwc->prev_count, -left);
+ atomic64_set(&hwc->count, -left);
+}
+
+static enum hrtimer_restart perf_swcounter_hrtimer(struct hrtimer *hrtimer)
+{
+ enum hrtimer_restart ret = HRTIMER_RESTART;
+ struct perf_counter *counter;
+ struct pt_regs *regs;
+
+ counter = container_of(hrtimer, struct perf_counter, hw.hrtimer);
+ counter->pmu->read(counter);
+
+ regs = get_irq_regs();
+ /*
+ * In case we exclude kernel IPs or are somehow not in interrupt
+ * context, provide the next best thing, the user IP.
+ */
+ if ((counter->hw_event.exclude_kernel || !regs) &&
+ !counter->hw_event.exclude_user)
+ regs = task_pt_regs(current);
+
+ if (regs) {
+ if (perf_counter_overflow(counter, 0, regs, 0))
+ ret = HRTIMER_NORESTART;
+ }
+
+ hrtimer_forward_now(hrtimer, ns_to_ktime(counter->hw.irq_period));
+
+ return ret;
+}
+
+static void perf_swcounter_overflow(struct perf_counter *counter,
+ int nmi, struct pt_regs *regs, u64 addr)
+{
+ perf_swcounter_update(counter);
+ perf_swcounter_set_period(counter);
+ if (perf_counter_overflow(counter, nmi, regs, addr))
+ /* soft-disable the counter */
+ ;
+
+}
+
+static int perf_swcounter_match(struct perf_counter *counter,
+ enum perf_event_types type,
+ u32 event, struct pt_regs *regs)
+{
+ if (counter->state != PERF_COUNTER_STATE_ACTIVE)
+ return 0;
+
+ if (perf_event_raw(&counter->hw_event))
+ return 0;
+
+ if (perf_event_type(&counter->hw_event) != type)
+ return 0;
+
+ if (perf_event_id(&counter->hw_event) != event)
+ return 0;
+
+ if (counter->hw_event.exclude_user && user_mode(regs))
+ return 0;
+
+ if (counter->hw_event.exclude_kernel && !user_mode(regs))
+ return 0;
+
+ return 1;
+}
+
+static void perf_swcounter_add(struct perf_counter *counter, u64 nr,
+ int nmi, struct pt_regs *regs, u64 addr)
+{
+ int neg = atomic64_add_negative(nr, &counter->hw.count);
+ if (counter->hw.irq_period && !neg)
+ perf_swcounter_overflow(counter, nmi, regs, addr);
+}
+
+static void perf_swcounter_ctx_event(struct perf_counter_context *ctx,
+ enum perf_event_types type, u32 event,
+ u64 nr, int nmi, struct pt_regs *regs,
+ u64 addr)
+{
+ struct perf_counter *counter;
+
+ if (system_state != SYSTEM_RUNNING || list_empty(&ctx->event_list))
+ return;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(counter, &ctx->event_list, event_entry) {
+ if (perf_swcounter_match(counter, type, event, regs))
+ perf_swcounter_add(counter, nr, nmi, regs, addr);
+ }
+ rcu_read_unlock();
+}
+
+static int *perf_swcounter_recursion_context(struct perf_cpu_context *cpuctx)
+{
+ if (in_nmi())
+ return &cpuctx->recursion[3];
+
+ if (in_irq())
+ return &cpuctx->recursion[2];
+
+ if (in_softirq())
+ return &cpuctx->recursion[1];
+
+ return &cpuctx->recursion[0];
+}
+
+static void __perf_swcounter_event(enum perf_event_types type, u32 event,
+ u64 nr, int nmi, struct pt_regs *regs,
+ u64 addr)
+{
+ struct perf_cpu_context *cpuctx = &get_cpu_var(perf_cpu_context);
+ int *recursion = perf_swcounter_recursion_context(cpuctx);
+
+ if (*recursion)
+ goto out;
+
+ (*recursion)++;
+ barrier();
+
+ perf_swcounter_ctx_event(&cpuctx->ctx, type, event,
+ nr, nmi, regs, addr);
+ if (cpuctx->task_ctx) {
+ perf_swcounter_ctx_event(cpuctx->task_ctx, type, event,
+ nr, nmi, regs, addr);
+ }
+
+ barrier();
+ (*recursion)--;
+
+out:
+ put_cpu_var(perf_cpu_context);
+}
+
+void
+perf_swcounter_event(u32 event, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
+{
+ __perf_swcounter_event(PERF_TYPE_SOFTWARE, event, nr, nmi, regs, addr);
}
-static void page_faults_perf_counter_read(struct perf_counter *counter)
+static void perf_swcounter_read(struct perf_counter *counter)
{
- page_faults_perf_counter_update(counter);
+ perf_swcounter_update(counter);
}
-static int page_faults_perf_counter_enable(struct perf_counter *counter)
+static int perf_swcounter_enable(struct perf_counter *counter)
{
- atomic64_set(&counter->hw.prev_count, get_page_faults(counter));
+ perf_swcounter_set_period(counter);
return 0;
}
-static void page_faults_perf_counter_disable(struct perf_counter *counter)
+static void perf_swcounter_disable(struct perf_counter *counter)
{
- page_faults_perf_counter_update(counter);
+ perf_swcounter_update(counter);
}
-static const struct hw_perf_counter_ops perf_ops_page_faults = {
- .enable = page_faults_perf_counter_enable,
- .disable = page_faults_perf_counter_disable,
- .read = page_faults_perf_counter_read,
+static const struct pmu perf_ops_generic = {
+ .enable = perf_swcounter_enable,
+ .disable = perf_swcounter_disable,
+ .read = perf_swcounter_read,
};
-static u64 get_context_switches(struct perf_counter *counter)
+/*
+ * Software counter: cpu wall time clock
+ */
+
+static void cpu_clock_perf_counter_update(struct perf_counter *counter)
{
- struct task_struct *curr = counter->ctx->task;
+ int cpu = raw_smp_processor_id();
+ s64 prev;
+ u64 now;
- if (curr)
- return curr->nvcsw + curr->nivcsw;
- return cpu_nr_switches(smp_processor_id());
+ now = cpu_clock(cpu);
+ prev = atomic64_read(&counter->hw.prev_count);
+ atomic64_set(&counter->hw.prev_count, now);
+ atomic64_add(now - prev, &counter->count);
}
-static void context_switches_perf_counter_update(struct perf_counter *counter)
+static int cpu_clock_perf_counter_enable(struct perf_counter *counter)
{
- u64 prev, now;
- s64 delta;
+ struct hw_perf_counter *hwc = &counter->hw;
+ int cpu = raw_smp_processor_id();
- prev = atomic64_read(&counter->hw.prev_count);
- now = get_context_switches(counter);
+ atomic64_set(&hwc->prev_count, cpu_clock(cpu));
+ hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ hwc->hrtimer.function = perf_swcounter_hrtimer;
+ if (hwc->irq_period) {
+ __hrtimer_start_range_ns(&hwc->hrtimer,
+ ns_to_ktime(hwc->irq_period), 0,
+ HRTIMER_MODE_REL, 0);
+ }
- atomic64_set(&counter->hw.prev_count, now);
+ return 0;
+}
- delta = now - prev;
+static void cpu_clock_perf_counter_disable(struct perf_counter *counter)
+{
+ hrtimer_cancel(&counter->hw.hrtimer);
+ cpu_clock_perf_counter_update(counter);
+}
- atomic64_add(delta, &counter->count);
+static void cpu_clock_perf_counter_read(struct perf_counter *counter)
+{
+ cpu_clock_perf_counter_update(counter);
}
-static void context_switches_perf_counter_read(struct perf_counter *counter)
+static const struct pmu perf_ops_cpu_clock = {
+ .enable = cpu_clock_perf_counter_enable,
+ .disable = cpu_clock_perf_counter_disable,
+ .read = cpu_clock_perf_counter_read,
+};
+
+/*
+ * Software counter: task time clock
+ */
+
+static void task_clock_perf_counter_update(struct perf_counter *counter, u64 now)
{
- context_switches_perf_counter_update(counter);
+ u64 prev;
+ s64 delta;
+
+ prev = atomic64_xchg(&counter->hw.prev_count, now);
+ delta = now - prev;
+ atomic64_add(delta, &counter->count);
}
-static int context_switches_perf_counter_enable(struct perf_counter *counter)
+static int task_clock_perf_counter_enable(struct perf_counter *counter)
{
- atomic64_set(&counter->hw.prev_count, get_context_switches(counter));
+ struct hw_perf_counter *hwc = &counter->hw;
+ u64 now;
+
+ now = counter->ctx->time;
+
+ atomic64_set(&hwc->prev_count, now);
+ hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ hwc->hrtimer.function = perf_swcounter_hrtimer;
+ if (hwc->irq_period) {
+ __hrtimer_start_range_ns(&hwc->hrtimer,
+ ns_to_ktime(hwc->irq_period), 0,
+ HRTIMER_MODE_REL, 0);
+ }
+
return 0;
}
-static void context_switches_perf_counter_disable(struct perf_counter *counter)
+static void task_clock_perf_counter_disable(struct perf_counter *counter)
+{
+ hrtimer_cancel(&counter->hw.hrtimer);
+ task_clock_perf_counter_update(counter, counter->ctx->time);
+
+}
+
+static void task_clock_perf_counter_read(struct perf_counter *counter)
{
- context_switches_perf_counter_update(counter);
+ u64 time;
+
+ if (!in_nmi()) {
+ update_context_time(counter->ctx);
+ time = counter->ctx->time;
+ } else {
+ u64 now = perf_clock();
+ u64 delta = now - counter->ctx->timestamp;
+ time = counter->ctx->time + delta;
+ }
+
+ task_clock_perf_counter_update(counter, time);
}
-static const struct hw_perf_counter_ops perf_ops_context_switches = {
- .enable = context_switches_perf_counter_enable,
- .disable = context_switches_perf_counter_disable,
- .read = context_switches_perf_counter_read,
+static const struct pmu perf_ops_task_clock = {
+ .enable = task_clock_perf_counter_enable,
+ .disable = task_clock_perf_counter_disable,
+ .read = task_clock_perf_counter_read,
};
+/*
+ * Software counter: cpu migrations
+ */
+
static inline u64 get_cpu_migrations(struct perf_counter *counter)
{
struct task_struct *curr = counter->ctx->task;
static int cpu_migrations_perf_counter_enable(struct perf_counter *counter)
{
- atomic64_set(&counter->hw.prev_count, get_cpu_migrations(counter));
+ if (counter->prev_state <= PERF_COUNTER_STATE_OFF)
+ atomic64_set(&counter->hw.prev_count,
+ get_cpu_migrations(counter));
return 0;
}
cpu_migrations_perf_counter_update(counter);
}
-static const struct hw_perf_counter_ops perf_ops_cpu_migrations = {
+static const struct pmu perf_ops_cpu_migrations = {
.enable = cpu_migrations_perf_counter_enable,
.disable = cpu_migrations_perf_counter_disable,
.read = cpu_migrations_perf_counter_read,
};
-static const struct hw_perf_counter_ops *
-sw_perf_counter_init(struct perf_counter *counter)
+#ifdef CONFIG_EVENT_PROFILE
+void perf_tpcounter_event(int event_id)
+{
+ struct pt_regs *regs = get_irq_regs();
+
+ if (!regs)
+ regs = task_pt_regs(current);
+
+ __perf_swcounter_event(PERF_TYPE_TRACEPOINT, event_id, 1, 1, regs, 0);
+}
+EXPORT_SYMBOL_GPL(perf_tpcounter_event);
+
+extern int ftrace_profile_enable(int);
+extern void ftrace_profile_disable(int);
+
+static void tp_perf_counter_destroy(struct perf_counter *counter)
+{
+ ftrace_profile_disable(perf_event_id(&counter->hw_event));
+}
+
+static const struct pmu *tp_perf_counter_init(struct perf_counter *counter)
+{
+ int event_id = perf_event_id(&counter->hw_event);
+ int ret;
+
+ ret = ftrace_profile_enable(event_id);
+ if (ret)
+ return NULL;
+
+ counter->destroy = tp_perf_counter_destroy;
+ counter->hw.irq_period = counter->hw_event.irq_period;
+
+ return &perf_ops_generic;
+}
+#else
+static const struct pmu *tp_perf_counter_init(struct perf_counter *counter)
+{
+ return NULL;
+}
+#endif
+
+static const struct pmu *sw_perf_counter_init(struct perf_counter *counter)
{
- const struct hw_perf_counter_ops *hw_ops = NULL;
+ struct perf_counter_hw_event *hw_event = &counter->hw_event;
+ const struct pmu *pmu = NULL;
+ struct hw_perf_counter *hwc = &counter->hw;
- switch (counter->hw_event.type) {
+ /*
+ * Software counters (currently) can't in general distinguish
+ * between user, kernel and hypervisor events.
+ * However, context switches and cpu migrations are considered
+ * to be kernel events, and page faults are never hypervisor
+ * events.
+ */
+ switch (perf_event_id(&counter->hw_event)) {
case PERF_COUNT_CPU_CLOCK:
- hw_ops = &perf_ops_cpu_clock;
+ pmu = &perf_ops_cpu_clock;
+
+ if (hw_event->irq_period && hw_event->irq_period < 10000)
+ hw_event->irq_period = 10000;
break;
case PERF_COUNT_TASK_CLOCK:
/*
* use the cpu_clock counter instead.
*/
if (counter->ctx->task)
- hw_ops = &perf_ops_task_clock;
+ pmu = &perf_ops_task_clock;
else
- hw_ops = &perf_ops_cpu_clock;
+ pmu = &perf_ops_cpu_clock;
+
+ if (hw_event->irq_period && hw_event->irq_period < 10000)
+ hw_event->irq_period = 10000;
break;
case PERF_COUNT_PAGE_FAULTS:
- hw_ops = &perf_ops_page_faults;
- break;
+ case PERF_COUNT_PAGE_FAULTS_MIN:
+ case PERF_COUNT_PAGE_FAULTS_MAJ:
case PERF_COUNT_CONTEXT_SWITCHES:
- hw_ops = &perf_ops_context_switches;
+ pmu = &perf_ops_generic;
break;
case PERF_COUNT_CPU_MIGRATIONS:
- hw_ops = &perf_ops_cpu_migrations;
- break;
- default:
+ if (!counter->hw_event.exclude_kernel)
+ pmu = &perf_ops_cpu_migrations;
break;
}
- return hw_ops;
+
+ if (pmu)
+ hwc->irq_period = hw_event->irq_period;
+
+ return pmu;
}
/*
struct perf_counter *group_leader,
gfp_t gfpflags)
{
- const struct hw_perf_counter_ops *hw_ops;
+ const struct pmu *pmu;
struct perf_counter *counter;
+ long err;
counter = kzalloc(sizeof(*counter), gfpflags);
if (!counter)
- return NULL;
+ return ERR_PTR(-ENOMEM);
/*
* Single counters are their own group leaders, with an
mutex_init(&counter->mutex);
INIT_LIST_HEAD(&counter->list_entry);
+ INIT_LIST_HEAD(&counter->event_entry);
INIT_LIST_HEAD(&counter->sibling_list);
init_waitqueue_head(&counter->waitq);
+ mutex_init(&counter->mmap_mutex);
+
INIT_LIST_HEAD(&counter->child_list);
- counter->irqdata = &counter->data[0];
- counter->usrdata = &counter->data[1];
counter->cpu = cpu;
counter->hw_event = *hw_event;
- counter->wakeup_pending = 0;
counter->group_leader = group_leader;
- counter->hw_ops = NULL;
+ counter->pmu = NULL;
counter->ctx = ctx;
counter->state = PERF_COUNTER_STATE_INACTIVE;
if (hw_event->disabled)
counter->state = PERF_COUNTER_STATE_OFF;
- hw_ops = NULL;
- if (!hw_event->raw && hw_event->type < 0)
- hw_ops = sw_perf_counter_init(counter);
- else
- hw_ops = hw_perf_counter_init(counter);
+ pmu = NULL;
+
+ if (perf_event_raw(hw_event)) {
+ pmu = hw_perf_counter_init(counter);
+ goto done;
+ }
+
+ switch (perf_event_type(hw_event)) {
+ case PERF_TYPE_HARDWARE:
+ pmu = hw_perf_counter_init(counter);
+ break;
- if (!hw_ops) {
+ case PERF_TYPE_SOFTWARE:
+ pmu = sw_perf_counter_init(counter);
+ break;
+
+ case PERF_TYPE_TRACEPOINT:
+ pmu = tp_perf_counter_init(counter);
+ break;
+ }
+done:
+ err = 0;
+ if (!pmu)
+ err = -EINVAL;
+ else if (IS_ERR(pmu))
+ err = PTR_ERR(pmu);
+
+ if (err) {
kfree(counter);
- return NULL;
+ return ERR_PTR(err);
}
- counter->hw_ops = hw_ops;
+
+ counter->pmu = pmu;
+
+ if (counter->hw_event.mmap)
+ atomic_inc(&nr_mmap_tracking);
+ if (counter->hw_event.munmap)
+ atomic_inc(&nr_munmap_tracking);
+ if (counter->hw_event.comm)
+ atomic_inc(&nr_comm_tracking);
return counter;
}
/**
- * sys_perf_task_open - open a performance counter, associate it to a task/cpu
+ * sys_perf_counter_open - open a performance counter, associate it to a task/cpu
*
* @hw_event_uptr: event type attributes for monitoring/sampling
* @pid: target pid
* @cpu: target cpu
* @group_fd: group leader counter fd
*/
-asmlinkage int
-sys_perf_counter_open(struct perf_counter_hw_event *hw_event_uptr __user,
- pid_t pid, int cpu, int group_fd)
+SYSCALL_DEFINE5(perf_counter_open,
+ const struct perf_counter_hw_event __user *, hw_event_uptr,
+ pid_t, pid, int, cpu, int, group_fd, unsigned long, flags)
{
struct perf_counter *counter, *group_leader;
struct perf_counter_hw_event hw_event;
int fput_needed2 = 0;
int ret;
+ /* for future expandability... */
+ if (flags)
+ return -EINVAL;
+
if (copy_from_user(&hw_event, hw_event_uptr, sizeof(hw_event)) != 0)
return -EFAULT;
goto err_put_context;
}
- ret = -EINVAL;
counter = perf_counter_alloc(&hw_event, cpu, ctx, group_leader,
GFP_KERNEL);
- if (!counter)
+ ret = PTR_ERR(counter);
+ if (IS_ERR(counter))
goto err_put_context;
ret = anon_inode_getfd("[perf_counter]", &perf_fops, counter, 0);
spin_lock_init(&ctx->lock);
mutex_init(&ctx->mutex);
INIT_LIST_HEAD(&ctx->counter_list);
+ INIT_LIST_HEAD(&ctx->event_list);
ctx->task = task;
}
child_counter = perf_counter_alloc(&parent_counter->hw_event,
parent_counter->cpu, child_ctx,
group_leader, GFP_KERNEL);
- if (!child_counter)
- return NULL;
+ if (IS_ERR(child_counter))
+ return child_counter;
/*
* Link it up in the child's context:
*/
child_counter->task = child;
- list_add_counter(child_counter, child_ctx);
- child_ctx->nr_counters++;
+ add_counter_to_ctx(child_counter, child_ctx);
child_counter->parent = parent_counter;
/*
{
struct perf_counter *leader;
struct perf_counter *sub;
+ struct perf_counter *child_ctr;
leader = inherit_counter(parent_counter, parent, parent_ctx,
child, NULL, child_ctx);
- if (!leader)
- return -ENOMEM;
+ if (IS_ERR(leader))
+ return PTR_ERR(leader);
list_for_each_entry(sub, &parent_counter->sibling_list, list_entry) {
- if (!inherit_counter(sub, parent, parent_ctx,
- child, leader, child_ctx))
- return -ENOMEM;
+ child_ctr = inherit_counter(sub, parent, parent_ctx,
+ child, leader, child_ctx);
+ if (IS_ERR(child_ctr))
+ return PTR_ERR(child_ctr);
}
return 0;
}
* Add back the child's count to the parent's count:
*/
atomic64_add(child_val, &parent_counter->count);
+ atomic64_add(child_counter->total_time_enabled,
+ &parent_counter->child_total_time_enabled);
+ atomic64_add(child_counter->total_time_running,
+ &parent_counter->child_total_time_running);
/*
* Remove this counter from the parent's list
if (child != current) {
wait_task_inactive(child, 0);
list_del_init(&child_counter->list_entry);
+ update_counter_times(child_counter);
} else {
struct perf_cpu_context *cpuctx;
unsigned long flags;
* Be careful about zapping the list - IRQ/NMI context
* could still be processing it:
*/
- curr_rq_lock_irq_save(&flags);
+ local_irq_save(flags);
perf_flags = hw_perf_save_disable();
cpuctx = &__get_cpu_var(perf_cpu_context);
group_sched_out(child_counter, cpuctx, child_ctx);
+ update_counter_times(child_counter);
list_del_init(&child_counter->list_entry);
child_ctx->nr_counters--;
hw_perf_restore(perf_flags);
- curr_rq_unlock_irq_restore(&flags);
+ local_irq_restore(flags);
}
parent_counter = child_counter->parent;
sync_child_counter(child_counter, parent_counter);
list_for_each_entry_safe(sub, tmp, &child_counter->sibling_list,
list_entry) {
- if (sub->parent)
+ if (sub->parent) {
sync_child_counter(sub, sub->parent);
- kfree(sub);
+ free_counter(sub);
+ }
}
+ free_counter(child_counter);
}
-
- if (!child_counter->filp || !atomic_long_read(&child_counter->filp->f_count))
- kfree(child_counter);
}
/*
cpuctx = &per_cpu(perf_cpu_context, cpu);
__perf_counter_init_context(&cpuctx->ctx, NULL);
- mutex_lock(&perf_resource_mutex);
+ spin_lock(&perf_resource_lock);
cpuctx->max_pertask = perf_max_counters - perf_reserved_percpu;
- mutex_unlock(&perf_resource_mutex);
+ spin_unlock(&perf_resource_lock);
hw_perf_counter_setup(cpu);
}
.notifier_call = perf_cpu_notify,
};
-static int __init perf_counter_init(void)
+void __init perf_counter_init(void)
{
perf_cpu_notify(&perf_cpu_nb, (unsigned long)CPU_UP_PREPARE,
(void *)(long)smp_processor_id());
register_cpu_notifier(&perf_cpu_nb);
-
- return 0;
}
-early_initcall(perf_counter_init);
static ssize_t perf_show_reserve_percpu(struct sysdev_class *class, char *buf)
{
if (val > perf_max_counters)
return -EINVAL;
- mutex_lock(&perf_resource_mutex);
+ spin_lock(&perf_resource_lock);
perf_reserved_percpu = val;
for_each_online_cpu(cpu) {
cpuctx = &per_cpu(perf_cpu_context, cpu);
cpuctx->max_pertask = mpt;
spin_unlock_irq(&cpuctx->ctx.lock);
}
- mutex_unlock(&perf_resource_mutex);
+ spin_unlock(&perf_resource_lock);
return count;
}
if (val > 1)
return -EINVAL;
- mutex_lock(&perf_resource_mutex);
+ spin_lock(&perf_resource_lock);
perf_overcommit = val;
- mutex_unlock(&perf_resource_mutex);
+ spin_unlock(&perf_resource_lock);
return count;
}