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perf annotate: Record the min/max cycles

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Currently perf has a feature to account cycles for LBRs

For example, on skylake:

  perf record -b ...
  perf report or perf annotate

And then browsing the annotate browser gives average cycle counts for
program blocks.

For some analysis it would be useful if we could know not only the
average cycles but also the min and max cycles.

This patch records the min and max cycles.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1526569118-14217-2-git-send-email-yao.jin@linux.intel.com
[ Switch from max/min to min/max ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao 2018-05-17 22:58:37 +08:00 • committed by Arnaldo Carvalho de Melo
parent 7903a70867
commit 48659ebf37
2 changed files with 17 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

14
tools/perf/util/annotate.c
View file

@ -760,6 +760,15 @@ static int __symbol__account_cycles(struct annotation *notes,
ch[offset].num_aggr++;
ch[offset].cycles_aggr += cycles;
if (cycles > ch[offset].cycles_max)
ch[offset].cycles_max = cycles;
if (ch[offset].cycles_min) {
if (cycles && cycles < ch[offset].cycles_min)
ch[offset].cycles_min = cycles;
} else
ch[offset].cycles_min = cycles;
if (!have_start && ch[offset].have_start)
return 0;
if (ch[offset].num) {
@ -953,8 +962,11 @@ void annotation__compute_ipc(struct annotation *notes, size_t size)
if (ch->have_start)
annotation__count_and_fill(notes, ch->start, offset, ch);
al = notes->offsets[offset];
if (al && ch->num_aggr)
if (al && ch->num_aggr) {
al->cycles = ch->cycles_aggr / ch->num_aggr;
al->cycles_max = ch->cycles_max;
al->cycles_min = ch->cycles_min;
}
notes->have_cycles = true;
}
}