perf evsel: Steal the counter reading routines from stat

[pandora-kernel.git] / tools / perf / util / evsel.c

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 6539ec9..3f5de51 100644 (file)
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1,6 +1,8 @@
 #include "evsel.h"
 #include "util.h"
 
+#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
+
 struct perf_evsel *perf_evsel__new(u32 type, u64 config, int idx)
 {
        struct perf_evsel *evsel = zalloc(sizeof(*evsel));
@@ -21,15 +23,101 @@ int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
        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 (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 = 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;
+}