[tip: perf/core] perf report: Support --percent-limit for --total-cycles

From: tip-bot2 for Jin Yao
Date: Tue Nov 12 2019 - 06:21:59 EST

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The following commit has been merged into the perf/core branch of tip:

Commit-ID: 0b49f83657d5fb9a35c592faab7c5ea16e387539
Gitweb: https://git.kernel.org/tip/0b49f83657d5fb9a35c592faab7c5ea16e387539
Author: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
AuthorDate: Thu, 07 Nov 2019 15:47:18 +08:00
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitterDate: Thu, 07 Nov 2019 10:14:48 -03:00

perf report: Support --percent-limit for --total-cycles

We have already supported the '--total-cycles' option in previous patch.
It's also useful to show entries only above a threshold percent.

This patch enables '--percent-limit' for not showing entries
under that percent.

For example:

perf report --total-cycles --stdio --percent-limit 1

# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 2M of event 'cycles'
# Event count (approx.): 2753248
#
# Sampled Cycles% Sampled Cycles Avg Cycles% Avg Cycles [Program Block Range] Shared Object
# ............... .............. ........... .......... ................................................................. ....................
#
26.04% 2.8M 0.40% 18 [div.c:42 -> div.c:39] div
15.17% 1.2M 0.16% 7 [random_r.c:357 -> random_r.c:380] libc-2.27.so
5.11% 402.0K 0.04% 2 [div.c:27 -> div.c:28] div
4.87% 381.6K 0.04% 2 [random.c:288 -> random.c:291] libc-2.27.so
4.53% 381.0K 0.04% 2 [div.c:40 -> div.c:40] div
3.85% 300.9K 0.02% 1 [div.c:22 -> div.c:25] div
3.08% 241.1K 0.02% 1 [rand.c:26 -> rand.c:27] libc-2.27.so
3.06% 240.0K 0.02% 1 [random.c:291 -> random.c:291] libc-2.27.so
2.78% 215.7K 0.02% 1 [random.c:298 -> random.c:298] libc-2.27.so
2.52% 198.3K 0.02% 1 [random.c:293 -> random.c:293] libc-2.27.so
2.36% 184.8K 0.02% 1 [rand.c:28 -> rand.c:28] libc-2.27.so
2.33% 180.5K 0.02% 1 [random.c:295 -> random.c:295] libc-2.27.so
2.28% 176.7K 0.02% 1 [random.c:295 -> random.c:295] libc-2.27.so
2.20% 168.8K 0.02% 1 [rand@plt+0 -> rand@plt+0] div
1.98% 158.2K 0.02% 1 [random_r.c:388 -> random_r.c:388] libc-2.27.so
1.57% 123.3K 0.02% 1 [div.c:42 -> div.c:44] div
1.44% 116.0K 0.42% 19 [random_r.c:357 -> random_r.c:394] libc-2.27.so

Committer testing:

>From second exapmple onwards slightly edited for brevity:

# perf report --total-cycles --percent-limit 2 --stdio
# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 6M of event 'cycles'
# Event count (approx.): 6299936
#
# Sampled Cycles% Sampled Cycles Avg Cycles% Avg Cycles [Program Block Range] Shared Object
# ............... .............. ........... .......... ...................................................................... ....................
#
2.17% 1.7M 0.08% 607 [compiler.h:199 -> common.c:221] [kernel.vmlinux]
#
# (Tip: Create an archive with symtabs to analyse on other machine: perf archive)
#
# perf report --total-cycles --percent-limit 1 --stdio
# Sampled Cycles% Sampled Cycles Avg Cycles% Avg Cycles [Program Block Range] Shared Object
2.17% 1.7M 0.08% 607 [compiler.h:199 -> common.c:221] [kernel.vmlinux]
1.75% 1.3M 8.34% 65.5K [memset-vec-unaligned-erms.S:147 -> memset-vec-unaligned-erms.S:151] libc-2.29.so
#
# perf report --total-cycles --percent-limit 0.7 --stdio
# Sampled Cycles% Sampled Cycles Avg Cycles% Avg Cycles [Program Block Range] Shared Object
2.17% 1.7M 0.08% 607 [compiler.h:199 -> common.c:221] [kernel.vmlinux]
1.75% 1.3M 8.34% 65.5K [memset-vec-unaligned-erms.S:147 -> memset-vec-unaligned-erms.S:151] libc-2.29.so
0.72% 544.5K 0.03% 230 [entry_64.S:657 -> entry_64.S:662] [kernel.vmlinux]
#

-------------------------------------------

It only shows the entries which 'Sampled Cycles%' > 1%.

v7:
---
No functional change. Only fix the conflict issue because
previous patches are changed.

v6:
---
No functional change. Only fix the conflict issue because
previous patches are changed.

v5:
---
No functional change. Only fix the conflict issue because
previous patches are changed.

v4:
---
No functional change. Only fix the build issue because
previous patches are changed.

Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Jin Yao <yao.jin@xxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lore.kernel.org/lkml/20191107074719.26139-7-yao.jin@xxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-report.c | 2 +-
tools/perf/ui/stdio/hist.c | 7 ++++++-
tools/perf/util/block-info.c | 10 ++++++++++
tools/perf/util/block-info.h | 2 ++
4 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 992b18b..ca41187 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -509,7 +509,7 @@ static int perf_evlist__tty_browse_hists(struct evlist *evlist,

if (rep->total_cycles_mode) {
report__browse_block_hists(&rep->block_reports[i++].hist,
- 0, pos);
+ rep->min_percent, pos);
continue;
}

diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index 655ef77..132056c 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -15,6 +15,7 @@
#include "../../util/srcline.h"
#include "../../util/string2.h"
#include "../../util/thread.h"
+#include "../../util/block-info.h"
#include <linux/ctype.h>
#include <linux/zalloc.h>

@@ -856,7 +857,11 @@ size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows,
if (h->filtered)
continue;

- percent = hist_entry__get_percent_limit(h);
+ if (symbol_conf.report_individual_block)
+ percent = block_info__total_cycles_percent(h);
+ else
+ percent = hist_entry__get_percent_limit(h);
+
if (percent < min_pcnt)
continue;

diff --git a/tools/perf/util/block-info.c b/tools/perf/util/block-info.c
index ba89175..597d120 100644
--- a/tools/perf/util/block-info.c
+++ b/tools/perf/util/block-info.c
@@ -454,3 +454,13 @@ int report__browse_block_hists(struct block_hist *bh, float min_percent,

return 0;
}
+
+float block_info__total_cycles_percent(struct hist_entry *he)
+{
+ struct block_info *bi = he->block_info;
+
+ if (bi->total_cycles)
+ return bi->cycles * 100.0 / bi->total_cycles;
+
+ return 0.0;
+}
diff --git a/tools/perf/util/block-info.h b/tools/perf/util/block-info.h
index 8309297..e4d20bc 100644
--- a/tools/perf/util/block-info.h
+++ b/tools/perf/util/block-info.h
@@ -73,4 +73,6 @@ struct block_report *block_info__create_report(struct evlist *evlist,
int report__browse_block_hists(struct block_hist *bh, float min_percent,
struct evsel *evsel);

+float block_info__total_cycles_percent(struct hist_entry *he);
+
#endif /* __PERF_BLOCK_H */

Next message: tip-bot2 for Jin Yao: "[tip: perf/core] perf hist: Support block formats with compare/sort/display"
Previous message: tip-bot2 for Ian Rogers: "[tip: perf/core] perf annotate: Fix heap overflow"
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