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Date: Thu, 9 Nov 2017 06:55:25 -0800
From: Andi Kleen <andi@...stfloor.org>
To: acme@...nel.org
Cc: jolsa@...nel.org, linux-kernel@...r.kernel.org,
Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH v1 2/5] perf, tools: Save event scaling factors in perf.data
From: Andi Kleen <ak@...ux.intel.com>
To process metrics, perf script needs to know the scaling
factors reported by sysfs for events. Save the scaling factors
in the perf.data metadata in a new SCALE header.
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
tools/perf/Documentation/perf.data-file-format.txt | 8 +++
tools/perf/util/header.c | 60 ++++++++++++++++++++++
tools/perf/util/header.h | 1 +
3 files changed, 69 insertions(+)
diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
index 15e8b48077ba..dc91d0578f46 100644
--- a/tools/perf/Documentation/perf.data-file-format.txt
+++ b/tools/perf/Documentation/perf.data-file-format.txt
@@ -261,6 +261,14 @@ struct {
struct perf_header_string map;
}[number_of_cache_levels];
+ HEADER_SCALE = 21,
+
+Save scaling factor of events. One entry for each event in the same
+order as other events in the header.
+
+ u32 nr;
+ double scale[nr];
+
other bits are reserved and should ignored for now
HEADER_FEAT_BITS = 256,
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 605bbd5404fb..4f1d23cfb9b0 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2147,6 +2147,65 @@ static int process_cache(struct feat_fd *ff, void *data __maybe_unused)
return -1;
}
+static int write_scale(struct feat_fd *ff, struct perf_evlist *evlist)
+{
+ u32 num;
+ struct perf_evsel *evsel;
+
+ num = 0;
+ evlist__for_each_entry (evlist, evsel)
+ num++;
+
+ if (do_write(ff, &num, sizeof num) < 0)
+ return -1;
+ evlist__for_each_entry (evlist, evsel) {
+ if (do_write(ff, &evsel->scale, sizeof(double)) < 0)
+ return -1;
+ }
+ return 0;
+}
+
+static void print_scale(struct feat_fd *ff, FILE *fp)
+{
+ struct perf_session *session;
+ struct perf_evsel *evsel;
+ int num = 0;
+
+ session = container_of(ff->ph, struct perf_session, header);
+
+ num = 0;
+ evlist__for_each_entry(session->evlist, evsel) {
+ fprintf(fp, "# event %d %s scale %f\n",
+ num++,
+ evsel->name,
+ evsel->scale);
+ }
+}
+
+static int process_scale(struct feat_fd *ff, void *data __maybe_unused)
+{
+ u32 cnt;
+ struct perf_evsel *evsel;
+ struct perf_session *session;
+
+ session = container_of(ff->ph, struct perf_session, header);
+ if (do_read_u32(ff, &cnt))
+ return -1;
+ evlist__for_each_entry(session->evlist, evsel) {
+ if (__do_read(ff, &evsel->scale, sizeof(double)))
+ return -1;
+ if (ff->ph->needs_swap)
+ mem_bswap_64(&evsel->scale, sizeof(double));
+ if (--cnt <= 0)
+ break;
+ }
+ if (cnt) {
+ pr_debug("missing scale descriptors\n");
+ return 1;
+ }
+ return 0;
+}
+
struct feature_ops {
int (*write)(struct feat_fd *ff, struct perf_evlist *evlist);
void (*print)(struct feat_fd *ff, FILE *fp);
@@ -2204,6 +2263,7 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
FEAT_OPN(AUXTRACE, auxtrace, false),
FEAT_OPN(STAT, stat, false),
FEAT_OPN(CACHE, cache, true),
+ FEAT_OPN(SCALE, scale, true),
};
struct header_print_data {
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index f7a16ee527b8..d13d9520191f 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -33,6 +33,7 @@ enum {
HEADER_AUXTRACE,
HEADER_STAT,
HEADER_CACHE,
+ HEADER_SCALE,
HEADER_LAST_FEATURE,
HEADER_FEAT_BITS = 256,
};
--
2.13.6
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