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Groups > linux.kernel > #1170242

[PATCH 18/27] perf stat: Introduce perf_evsel__read function

From Jiri Olsa <jolsa@kernel.org>
Newsgroups linux.kernel
Subject [PATCH 18/27] perf stat: Introduce perf_evsel__read function
Date 2015-06-23 00:40 +0200
Message-ID <pEixJ-Bm-31@gated-at.bofh.it> (permalink)
References <pEixI-Bm-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Adding simple read function that reads/store data
into given struct perf_counts_values *count object.

Link: http://lkml.kernel.org/n/tip-9r2zmzq0vkw8l300usq824sg@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/evsel.c | 14 ++++++++++++++
 tools/perf/util/evsel.h |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index cd6ce7066f85..2e0a4e064f44 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -955,6 +955,20 @@ int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread,
 	return cb(evsel, cpu, thread, &count);
 }
 
+int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
+		     struct perf_counts_values *count)
+{
+	memset(count, 0, sizeof(*count));
+
+	if (FD(evsel, cpu, thread) < 0)
+		return -EINVAL;
+
+	if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0)
+		return -errno;
+
+	return 0;
+}
+
 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
 			      int cpu, int thread, bool scale)
 {
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 020f7e13634a..a79944a21e8f 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -236,6 +236,9 @@ typedef int (perf_evsel__read_cb_t)(struct perf_evsel *evsel,
 int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread,
 			perf_evsel__read_cb_t cb);
 
+int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
+		     struct perf_counts_values *count);
+
 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
 			      int cpu, int thread, bool scale);
 
-- 
1.9.3

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[PATCHv4 00/27] perf stat: Introduce --per-thread option Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 14/27] perf stat: Move perf_evsel__(alloc|free|reset)_stat_priv into stat object Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 17/27] perf stat: Introduce perf_evsel__alloc_stats function Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 07/27] perf tools: Make perf_evsel__(nr_)cpus generic Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 04/27] perf tools: Add reference counting for thread_map object Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 25/27] perf stat: Using init_stats instead of memset Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 23/27] perf stat: Remove perf_evsel__read_cb function Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 18/27] perf stat: Introduce perf_evsel__read function Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 15/27] perf stat: Move perf_evsel__(alloc|free)_prev_raw_counts into stat object Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 02/27] perf tools: Add comm string into struct thread_map Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 21/27] perf stat: Move zero_per_pkg into counter process code Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 27/27] perf stat: Introduce --per-thread option Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 11/27] perf stat: Make stats work over the thread dimension Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 13/27] perf stat: Introduce perf_evlist__reset_stats Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 06/27] perf tools: Propagate thread maps through the evlist Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 05/27] perf tools: Propagate cpu maps through the evlist Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:40 +0200
  [PATCH 20/27] perf stat: Separate counters reading and processing Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:50 +0200
  [PATCH 24/27] perf stat: Rename print_interval to process_interval Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:50 +0200
  [PATCH 22/27] perf stat: Move perf_stat initialization counter process code Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:50 +0200
  [PATCH 19/27] perf stat: Introduce read_counters function Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:50 +0200
  [PATCH 08/27] perf tests: Add thread_map object tests Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:50 +0200
  [PATCH 26/27] perf stat: Introduce print_counters function Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:50 +0200
  [PATCH 09/27] perf stat: Introduce perf_counts function Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:50 +0200
  [PATCH 10/27] perf stat: Use xyarray for cpu evsel counts Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:50 +0200
  [PATCH 16/27] perf stat: Move perf_evlist__(alloc|free|reset)_stats into stat object Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:50 +0200
  [PATCH 12/27] perf stat: Rename struct perf_counts::cpu member to values Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:50 +0200
  [PATCH 03/27] perf tools: Add reference counting for cpu_map object Jiri Olsa <jolsa@kernel.org> - 2015-06-23 00:50 +0200
  Re: [PATCHv4 00/27] perf stat: Introduce --per-thread option Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-06-23 01:10 +0200

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