Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / tools / perf / util / evsel.c

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
new file mode 100644 (file)
index 0000000..d8575d3
--- /dev/null
+++ b/tools/perf/util/evsel.c
@@ -0,0 +1,201 @@
+#include "evsel.h"
+#include "../perf.h"
+#include "util.h"
+#include "cpumap.h"
+#include "thread.h"
+
+#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
+
+struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
+{
+       struct perf_evsel *evsel = zalloc(sizeof(*evsel));
+
+       if (evsel != NULL) {
+               evsel->idx         = idx;
+               evsel->attr        = *attr;
+               INIT_LIST_HEAD(&evsel->node);
+       }
+
+       return evsel;
+}
+
+int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
+{
+       evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
+       return evsel->fd != NULL ? 0 : -ENOMEM;
+}
+
+int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus)
+{
+       evsel->counts = zalloc((sizeof(*evsel->counts) +
+                               (ncpus * sizeof(struct perf_counts_values))));
+       return evsel->counts != NULL ? 0 : -ENOMEM;
+}
+
+void perf_evsel__free_fd(struct perf_evsel *evsel)
+{
+       xyarray__delete(evsel->fd);
+       evsel->fd = NULL;
+}
+
+void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
+{
+       int cpu, thread;
+
+       for (cpu = 0; cpu < ncpus; cpu++)
+               for (thread = 0; thread < nthreads; ++thread) {
+                       close(FD(evsel, cpu, thread));
+                       FD(evsel, cpu, thread) = -1;
+               }
+}
+
+void perf_evsel__delete(struct perf_evsel *evsel)
+{
+       assert(list_empty(&evsel->node));
+       xyarray__delete(evsel->fd);
+       free(evsel);
+}
+
+int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
+                             int cpu, int thread, bool scale)
+{
+       struct perf_counts_values count;
+       size_t nv = scale ? 3 : 1;
+
+       if (FD(evsel, cpu, thread) < 0)
+               return -EINVAL;
+
+       if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1) < 0)
+               return -ENOMEM;
+
+       if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
+               return -errno;
+
+       if (scale) {
+               if (count.run == 0)
+                       count.val = 0;
+               else if (count.run < count.ena)
+                       count.val = (u64)((double)count.val * count.ena / count.run + 0.5);
+       } else
+               count.ena = count.run = 0;
+
+       evsel->counts->cpu[cpu] = count;
+       return 0;
+}
+
+int __perf_evsel__read(struct perf_evsel *evsel,
+                      int ncpus, int nthreads, bool scale)
+{
+       size_t nv = scale ? 3 : 1;
+       int cpu, thread;
+       struct perf_counts_values *aggr = &evsel->counts->aggr, count;
+
+       aggr->val = aggr->ena = aggr->run = 0;
+
+       for (cpu = 0; cpu < ncpus; cpu++) {
+               for (thread = 0; thread < nthreads; thread++) {
+                       if (FD(evsel, cpu, thread) < 0)
+                               continue;
+
+                       if (readn(FD(evsel, cpu, thread),
+                                 &count, nv * sizeof(u64)) < 0)
+                               return -errno;
+
+                       aggr->val += count.val;
+                       if (scale) {
+                               aggr->ena += count.ena;
+                               aggr->run += count.run;
+                       }
+               }
+       }
+
+       evsel->counts->scaled = 0;
+       if (scale) {
+               if (aggr->run == 0) {
+                       evsel->counts->scaled = -1;
+                       aggr->val = 0;
+                       return 0;
+               }
+
+               if (aggr->run < aggr->ena) {
+                       evsel->counts->scaled = 1;
+                       aggr->val = (u64)((double)aggr->val * aggr->ena / aggr->run + 0.5);
+               }
+       } else
+               aggr->ena = aggr->run = 0;
+
+       return 0;
+}
+
+static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
+                             struct thread_map *threads)
+{
+       int cpu, thread;
+
+       if (evsel->fd == NULL &&
+           perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
+               return -1;
+
+       for (cpu = 0; cpu < cpus->nr; cpu++) {
+               for (thread = 0; thread < threads->nr; thread++) {
+                       FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
+                                                                    threads->map[thread],
+                                                                    cpus->map[cpu], -1, 0);
+                       if (FD(evsel, cpu, thread) < 0)
+                               goto out_close;
+               }
+       }
+
+       return 0;
+
+out_close:
+       do {
+               while (--thread >= 0) {
+                       close(FD(evsel, cpu, thread));
+                       FD(evsel, cpu, thread) = -1;
+               }
+               thread = threads->nr;
+       } while (--cpu >= 0);
+       return -1;
+}
+
+static struct {
+       struct cpu_map map;
+       int cpus[1];
+} empty_cpu_map = {
+       .map.nr = 1,
+       .cpus   = { -1, },
+};
+
+static struct {
+       struct thread_map map;
+       int threads[1];
+} empty_thread_map = {
+       .map.nr  = 1,
+       .threads = { -1, },
+};
+
+int perf_evsel__open(struct perf_evsel *evsel,
+                    struct cpu_map *cpus, struct thread_map *threads)
+{
+
+       if (cpus == NULL) {
+               /* Work around old compiler warnings about strict aliasing */
+               cpus = &empty_cpu_map.map;
+       }
+
+       if (threads == NULL)
+               threads = &empty_thread_map.map;
+
+       return __perf_evsel__open(evsel, cpus, threads);
+}
+
+int perf_evsel__open_per_cpu(struct perf_evsel *evsel, struct cpu_map *cpus)
+{
+       return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
+}
+
+int perf_evsel__open_per_thread(struct perf_evsel *evsel, struct thread_map *threads)
+{
+       return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
+}