From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 31 Dec 2008 01:31:25 +0000 (-0800)
Subject: Merge branch 'oprofile-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git... 
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=526ea064f953fc5ad2fb905b537f490b9374a0f0;p=linux-beck.git

Merge branch 'oprofile-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'oprofile-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  oprofile: select RING_BUFFER
  ring_buffer: adding EXPORT_SYMBOLs
  oprofile: fix lost sample counter
  oprofile: remove nr_available_slots()
  oprofile: port to the new ring_buffer
  ring_buffer: add remaining cpu functions to ring_buffer.h
  oprofile: moving cpu_buffer_reset() to cpu_buffer.h
  oprofile: adding cpu_buffer_entries()
  oprofile: adding cpu_buffer_write_commit()
  oprofile: adding cpu buffer r/w access functions
  ftrace: remove unused function arg in trace_iterator_increment()
  ring_buffer: update description for ring_buffer_alloc()
  oprofile: set values to default when creating oprofilefs
  oprofile: implement switch/case in buffer_sync.c
  x86/oprofile: cleanup IBS init/exit functions in op_model_amd.c
  x86/oprofile: reordering IBS code in op_model_amd.c
  oprofile: fix typo
  oprofile: whitspace changes only
  oprofile: update comment for oprofile_add_sample()
  oprofile: comment cleanup
---

526ea064f953fc5ad2fb905b537f490b9374a0f0
diff --cc kernel/trace/ring_buffer.c
index 76f34c0ef29c,30d57dd01a85..1d601a7c4587
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@@ -67,8 -29,9 +67,9 @@@ static long ring_buffer_flags __read_mo
   */
  void tracing_on(void)
  {
 -	ring_buffers_off = 0;
 +	set_bit(RB_BUFFERS_ON_BIT, &ring_buffer_flags);
  }
+ EXPORT_SYMBOL_GPL(tracing_on);
  
  /**
   * tracing_off - turn off all tracing buffers
@@@ -80,22 -43,10 +81,23 @@@
   */
  void tracing_off(void)
  {
 -	ring_buffers_off = 1;
 +	clear_bit(RB_BUFFERS_ON_BIT, &ring_buffer_flags);
  }
+ EXPORT_SYMBOL_GPL(tracing_off);
  
 +/**
 + * tracing_off_permanent - permanently disable ring buffers
 + *
 + * This function, once called, will disable all ring buffers
 + * permanenty.
 + */
 +void tracing_off_permanent(void)
 +{
 +	set_bit(RB_BUFFERS_DISABLED_BIT, &ring_buffer_flags);
 +}
 +
 +#include "trace.h"
 +
  /* Up this if you want to test the TIME_EXTENTS and normalization */
  #define DEBUG_SHIFT 0
  
@@@ -1301,9 -1223,13 +1310,10 @@@ ring_buffer_lock_reserve(struct ring_bu
  	return event;
  
   out:
 -	if (resched)
 -		preempt_enable_no_resched_notrace();
 -	else
 -		preempt_enable_notrace();
 +	ftrace_preempt_enable(resched);
  	return NULL;
  }
+ EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
  
  static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
  		      struct ring_buffer_event *event)
@@@ -1565,8 -1507,16 +1584,9 @@@ unsigned long ring_buffer_overruns(stru
  
  	return overruns;
  }
+ EXPORT_SYMBOL_GPL(ring_buffer_overruns);
  
 -/**
 - * ring_buffer_iter_reset - reset an iterator
 - * @iter: The iterator to reset
 - *
 - * Resets the iterator, so that it will start from the beginning
 - * again.
 - */
 -void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
 +static void rb_iter_reset(struct ring_buffer_iter *iter)
  {
  	struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
  
@@@ -1581,25 -1531,9 +1601,26 @@@
  	if (iter->head)
  		iter->read_stamp = cpu_buffer->read_stamp;
  	else
 -		iter->read_stamp = iter->head_page->time_stamp;
 +		iter->read_stamp = iter->head_page->page->time_stamp;
 +}
 +
 +/**
 + * ring_buffer_iter_reset - reset an iterator
 + * @iter: The iterator to reset
 + *
 + * Resets the iterator, so that it will start from the beginning
 + * again.
 + */
 +void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
 +{
 +	struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
 +	unsigned long flags;
 +
 +	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
 +	rb_iter_reset(iter);
 +	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
  }
+ EXPORT_SYMBOL_GPL(ring_buffer_iter_reset);
  
  /**
   * ring_buffer_iter_empty - check if an iterator has no more to read
@@@ -1880,9 -1819,18 +1902,10 @@@ rb_buffer_peek(struct ring_buffer *buff
  
  	return NULL;
  }
+ EXPORT_SYMBOL_GPL(ring_buffer_peek);
  
 -/**
 - * ring_buffer_iter_peek - peek at the next event to be read
 - * @iter: The ring buffer iterator
 - * @ts: The timestamp counter of this event.
 - *
 - * This will return the event that will be read next, but does
 - * not increment the iterator.
 - */
 -struct ring_buffer_event *
 -ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
 +static struct ring_buffer_event *
 +rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
  {
  	struct ring_buffer *buffer;
  	struct ring_buffer_per_cpu *cpu_buffer;
@@@ -1940,52 -1890,8 +1963,53 @@@
  
  	return NULL;
  }
+ EXPORT_SYMBOL_GPL(ring_buffer_iter_peek);
  
 +/**
 + * ring_buffer_peek - peek at the next event to be read
 + * @buffer: The ring buffer to read
 + * @cpu: The cpu to peak at
 + * @ts: The timestamp counter of this event.
 + *
 + * This will return the event that will be read next, but does
 + * not consume the data.
 + */
 +struct ring_buffer_event *
 +ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
 +{
 +	struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
 +	struct ring_buffer_event *event;
 +	unsigned long flags;
 +
 +	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
 +	event = rb_buffer_peek(buffer, cpu, ts);
 +	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 +
 +	return event;
 +}
 +
 +/**
 + * ring_buffer_iter_peek - peek at the next event to be read
 + * @iter: The ring buffer iterator
 + * @ts: The timestamp counter of this event.
 + *
 + * This will return the event that will be read next, but does
 + * not increment the iterator.
 + */
 +struct ring_buffer_event *
 +ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
 +{
 +	struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
 +	struct ring_buffer_event *event;
 +	unsigned long flags;
 +
 +	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
 +	event = rb_iter_peek(iter, ts);
 +	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 +
 +	return event;
 +}
 +
  /**
   * ring_buffer_consume - return an event and consume it
   * @buffer: The ring buffer to get the next event from
@@@ -2004,19 -1909,16 +2028,20 @@@ ring_buffer_consume(struct ring_buffer 
  	if (!cpu_isset(cpu, buffer->cpumask))
  		return NULL;
  
 -	event = ring_buffer_peek(buffer, cpu, ts);
 +	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
 +
 +	event = rb_buffer_peek(buffer, cpu, ts);
  	if (!event)
 -		return NULL;
 +		goto out;
  
 -	cpu_buffer = buffer->buffers[cpu];
  	rb_advance_reader(cpu_buffer);
  
 + out:
 +	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 +
  	return event;
  }
+ EXPORT_SYMBOL_GPL(ring_buffer_consume);
  
  /**
   * ring_buffer_read_start - start a non consuming read of the buffer
@@@ -2152,10 -2049,9 +2181,11 @@@ void ring_buffer_reset_cpu(struct ring_
  
  	rb_reset_cpu(cpu_buffer);
  
 -	spin_unlock_irqrestore(&cpu_buffer->lock, flags);
 +	__raw_spin_unlock(&cpu_buffer->lock);
 +
 +	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
  }
+ EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);
  
  /**
   * ring_buffer_reset - reset a ring buffer
@@@ -2250,167 -2150,8 +2283,168 @@@ int ring_buffer_swap_cpu(struct ring_bu
  
  	return 0;
  }
+ EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);
  
 +static void rb_remove_entries(struct ring_buffer_per_cpu *cpu_buffer,
 +			      struct buffer_data_page *bpage)
 +{
 +	struct ring_buffer_event *event;
 +	unsigned long head;
 +
 +	__raw_spin_lock(&cpu_buffer->lock);
 +	for (head = 0; head < local_read(&bpage->commit);
 +	     head += rb_event_length(event)) {
 +
 +		event = __rb_data_page_index(bpage, head);
 +		if (RB_WARN_ON(cpu_buffer, rb_null_event(event)))
 +			return;
 +		/* Only count data entries */
 +		if (event->type != RINGBUF_TYPE_DATA)
 +			continue;
 +		cpu_buffer->entries--;
 +	}
 +	__raw_spin_unlock(&cpu_buffer->lock);
 +}
 +
 +/**
 + * ring_buffer_alloc_read_page - allocate a page to read from buffer
 + * @buffer: the buffer to allocate for.
 + *
 + * This function is used in conjunction with ring_buffer_read_page.
 + * When reading a full page from the ring buffer, these functions
 + * can be used to speed up the process. The calling function should
 + * allocate a few pages first with this function. Then when it
 + * needs to get pages from the ring buffer, it passes the result
 + * of this function into ring_buffer_read_page, which will swap
 + * the page that was allocated, with the read page of the buffer.
 + *
 + * Returns:
 + *  The page allocated, or NULL on error.
 + */
 +void *ring_buffer_alloc_read_page(struct ring_buffer *buffer)
 +{
 +	unsigned long addr;
 +	struct buffer_data_page *bpage;
 +
 +	addr = __get_free_page(GFP_KERNEL);
 +	if (!addr)
 +		return NULL;
 +
 +	bpage = (void *)addr;
 +
 +	return bpage;
 +}
 +
 +/**
 + * ring_buffer_free_read_page - free an allocated read page
 + * @buffer: the buffer the page was allocate for
 + * @data: the page to free
 + *
 + * Free a page allocated from ring_buffer_alloc_read_page.
 + */
 +void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data)
 +{
 +	free_page((unsigned long)data);
 +}
 +
 +/**
 + * ring_buffer_read_page - extract a page from the ring buffer
 + * @buffer: buffer to extract from
 + * @data_page: the page to use allocated from ring_buffer_alloc_read_page
 + * @cpu: the cpu of the buffer to extract
 + * @full: should the extraction only happen when the page is full.
 + *
 + * This function will pull out a page from the ring buffer and consume it.
 + * @data_page must be the address of the variable that was returned
 + * from ring_buffer_alloc_read_page. This is because the page might be used
 + * to swap with a page in the ring buffer.
 + *
 + * for example:
 + *	rpage = ring_buffer_alloc_page(buffer);
 + *	if (!rpage)
 + *		return error;
 + *	ret = ring_buffer_read_page(buffer, &rpage, cpu, 0);
 + *	if (ret)
 + *		process_page(rpage);
 + *
 + * When @full is set, the function will not return true unless
 + * the writer is off the reader page.
 + *
 + * Note: it is up to the calling functions to handle sleeps and wakeups.
 + *  The ring buffer can be used anywhere in the kernel and can not
 + *  blindly call wake_up. The layer that uses the ring buffer must be
 + *  responsible for that.
 + *
 + * Returns:
 + *  1 if data has been transferred
 + *  0 if no data has been transferred.
 + */
 +int ring_buffer_read_page(struct ring_buffer *buffer,
 +			    void **data_page, int cpu, int full)
 +{
 +	struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
 +	struct ring_buffer_event *event;
 +	struct buffer_data_page *bpage;
 +	unsigned long flags;
 +	int ret = 0;
 +
 +	if (!data_page)
 +		return 0;
 +
 +	bpage = *data_page;
 +	if (!bpage)
 +		return 0;
 +
 +	spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
 +
 +	/*
 +	 * rb_buffer_peek will get the next ring buffer if
 +	 * the current reader page is empty.
 +	 */
 +	event = rb_buffer_peek(buffer, cpu, NULL);
 +	if (!event)
 +		goto out;
 +
 +	/* check for data */
 +	if (!local_read(&cpu_buffer->reader_page->page->commit))
 +		goto out;
 +	/*
 +	 * If the writer is already off of the read page, then simply
 +	 * switch the read page with the given page. Otherwise
 +	 * we need to copy the data from the reader to the writer.
 +	 */
 +	if (cpu_buffer->reader_page == cpu_buffer->commit_page) {
 +		unsigned int read = cpu_buffer->reader_page->read;
 +
 +		if (full)
 +			goto out;
 +		/* The writer is still on the reader page, we must copy */
 +		bpage = cpu_buffer->reader_page->page;
 +		memcpy(bpage->data,
 +		       cpu_buffer->reader_page->page->data + read,
 +		       local_read(&bpage->commit) - read);
 +
 +		/* consume what was read */
 +		cpu_buffer->reader_page += read;
 +
 +	} else {
 +		/* swap the pages */
 +		rb_init_page(bpage);
 +		bpage = cpu_buffer->reader_page->page;
 +		cpu_buffer->reader_page->page = *data_page;
 +		cpu_buffer->reader_page->read = 0;
 +		*data_page = bpage;
 +	}
 +	ret = 1;
 +
 +	/* update the entry counter */
 +	rb_remove_entries(cpu_buffer, bpage);
 + out:
 +	spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
 +
 +	return ret;
 +}
 +
  static ssize_t
  rb_simple_read(struct file *filp, char __user *ubuf,
  	       size_t cnt, loff_t *ppos)
diff --cc kernel/trace/trace.c
index f4bb3800318b,a96b335fe75c..3608f6cb2f7a
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@@ -1307,10 -912,9 +1307,10 @@@ void tracing_stop_function_trace(void
  
  enum trace_file_type {
  	TRACE_FILE_LAT_FMT	= 1,
 +	TRACE_FILE_ANNOTATE	= 2,
  };
  
- static void trace_iterator_increment(struct trace_iterator *iter, int cpu)
+ static void trace_iterator_increment(struct trace_iterator *iter)
  {
  	/* Don't allow ftrace to trace into the ring buffers */
  	ftrace_disable_cpu();