[PATCH v3 1/2] perf tools: add evsel prev_raw_count field

From: Stephane Eranian
Date: Fri Jan 18 2013 - 11:27:40 EST


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@xxxxxxxxxx>
---
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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