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    Subject[PATCH v4 1/2] perf tools: add evsel prev_raw_count field
    Date
    This field will be used by commands which print
    counter deltas on regular timer intervals,
    such as perf stat -I.

    Signed-off-by: Stephane Eranian <eranian@google.com>
    ---
    tools/perf/util/evsel.c | 26 ++++++++++++++++++++++++++
    tools/perf/util/evsel.h | 1 +
    2 files changed, 27 insertions(+)

    diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
    index 1b16dd1..371e93d 100644
    --- a/tools/perf/util/evsel.c
    +++ b/tools/perf/util/evsel.c
    @@ -631,6 +631,28 @@ void perf_evsel__delete(struct perf_evsel *evsel)
    free(evsel);
    }

    +static inline void compute_deltas(struct perf_evsel *evsel,
    + int cpu,
    + struct perf_counts_values *count)
    +{
    + struct perf_counts_values tmp;
    +
    + if (!evsel->prev_raw_counts)
    + return;
    +
    + if (cpu == -1) {
    + tmp = evsel->prev_raw_counts->aggr;
    + evsel->prev_raw_counts->aggr = *count;
    + } else {
    + tmp = evsel->prev_raw_counts->cpu[cpu];
    + evsel->prev_raw_counts->cpu[cpu] = *count;
    + }
    +
    + count->val = count->val - tmp.val;
    + count->ena = count->ena - tmp.ena;
    + count->run = count->run - tmp.run;
    +}
    +
    int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
    int cpu, int thread, bool scale)
    {
    @@ -646,6 +668,8 @@ int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
    if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
    return -errno;

    + compute_deltas(evsel, cpu, &count);
    +
    if (scale) {
    if (count.run == 0)
    count.val = 0;
    @@ -684,6 +708,8 @@ int __perf_evsel__read(struct perf_evsel *evsel,
    }
    }

    + compute_deltas(evsel, -1, aggr);
    +
    evsel->counts->scaled = 0;
    if (scale) {
    if (aggr->run == 0) {
    diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
    index 3d2b801..63ea570 100644
    --- a/tools/perf/util/evsel.h
    +++ b/tools/perf/util/evsel.h
    @@ -53,6 +53,7 @@ struct perf_evsel {
    struct xyarray *sample_id;
    u64 *id;
    struct perf_counts *counts;
    + struct perf_counts *prev_raw_counts;
    int idx;
    u32 ids;
    struct hists hists;
    --
    1.7.9.5


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