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Subject[tip:perf/core] perf evsel: Add prev_raw_count field
Commit-ID:  c7a79c47c683de6979a3e1a96dc723b0606c07ca
Gitweb: http://git.kernel.org/tip/c7a79c47c683de6979a3e1a96dc723b0606c07ca
Author: Stephane Eranian <eranian@google.com>
AuthorDate: Tue, 29 Jan 2013 12:47:43 +0100
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 30 Jan 2013 10:36:38 -0300

perf evsel: Add prev_raw_count field

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>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1359460064-3060-2-git-send-email-eranian@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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 e45332d..dbdcca4 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -659,6 +659,28 @@ 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)
{
@@ -674,6 +696,8 @@ 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;
@@ -712,6 +736,8 @@ 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 c68d1b8..3a4cd60 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;

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