forked from Minki/linux
9df38e82e2
Move 'struct perf_counts' allocation|free|reset code into separate functions. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1434269985-521-13-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
133 lines
2.6 KiB
C
133 lines
2.6 KiB
C
#include <math.h>
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#include "stat.h"
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#include "evsel.h"
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void update_stats(struct stats *stats, u64 val)
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{
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double delta;
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stats->n++;
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delta = val - stats->mean;
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stats->mean += delta / stats->n;
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stats->M2 += delta*(val - stats->mean);
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if (val > stats->max)
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stats->max = val;
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if (val < stats->min)
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stats->min = val;
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}
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double avg_stats(struct stats *stats)
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{
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return stats->mean;
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}
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/*
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* http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
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*
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* (\Sum n_i^2) - ((\Sum n_i)^2)/n
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* s^2 = -------------------------------
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* n - 1
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*
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* http://en.wikipedia.org/wiki/Stddev
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*
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* The std dev of the mean is related to the std dev by:
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*
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* s
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* s_mean = -------
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* sqrt(n)
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*
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*/
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double stddev_stats(struct stats *stats)
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{
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double variance, variance_mean;
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if (stats->n < 2)
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return 0.0;
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variance = stats->M2 / (stats->n - 1);
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variance_mean = variance / stats->n;
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return sqrt(variance_mean);
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}
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double rel_stddev_stats(double stddev, double avg)
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{
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double pct = 0.0;
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if (avg)
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pct = 100.0 * stddev/avg;
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return pct;
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}
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bool __perf_evsel_stat__is(struct perf_evsel *evsel,
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enum perf_stat_evsel_id id)
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{
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struct perf_stat *ps = evsel->priv;
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return ps->id == id;
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}
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#define ID(id, name) [PERF_STAT_EVSEL_ID__##id] = #name
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static const char *id_str[PERF_STAT_EVSEL_ID__MAX] = {
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ID(NONE, x),
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ID(CYCLES_IN_TX, cpu/cycles-t/),
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ID(TRANSACTION_START, cpu/tx-start/),
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ID(ELISION_START, cpu/el-start/),
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ID(CYCLES_IN_TX_CP, cpu/cycles-ct/),
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};
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#undef ID
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void perf_stat_evsel_id_init(struct perf_evsel *evsel)
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{
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struct perf_stat *ps = evsel->priv;
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int i;
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/* ps->id is 0 hence PERF_STAT_EVSEL_ID__NONE by default */
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for (i = 0; i < PERF_STAT_EVSEL_ID__MAX; i++) {
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if (!strcmp(perf_evsel__name(evsel), id_str[i])) {
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ps->id = i;
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break;
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}
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}
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}
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struct perf_counts *perf_counts__new(int ncpus)
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{
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int size = sizeof(struct perf_counts) +
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ncpus * sizeof(struct perf_counts_values);
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return zalloc(size);
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}
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void perf_counts__delete(struct perf_counts *counts)
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{
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free(counts);
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}
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static void perf_counts__reset(struct perf_counts *counts, int ncpus)
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{
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memset(counts, 0, (sizeof(*counts) +
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(ncpus * sizeof(struct perf_counts_values))));
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}
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void perf_evsel__reset_counts(struct perf_evsel *evsel, int ncpus)
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{
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perf_counts__reset(evsel->counts, ncpus);
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}
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int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus)
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{
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evsel->counts = perf_counts__new(ncpus);
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return evsel->counts != NULL ? 0 : -ENOMEM;
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}
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void perf_evsel__free_counts(struct perf_evsel *evsel)
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{
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perf_counts__delete(evsel->counts);
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evsel->counts = NULL;
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}
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