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perf diff: Support --cpu filter option 

To improve 'perf diff', implement a --cpu filter option.

Multiple CPUs can be provided as a comma-separated list with no space:
0,1.  Ranges of CPUs are specified with -: 0-2. Default is to report
samples on all CPUs.

For example,

  perf diff --cpu 0,1

It only diff the samples for CPU0 and CPU1.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1551791143-10334-3-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao 2019-03-05 21:05:42 +08:00 committed by Arnaldo Carvalho de Melo
parent 4802138d78
commit daca23b200
2 changed files with 21 additions and 0 deletions
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5
tools/perf/Documentation/perf-diff.txt
View File

@ -163,6 +163,11 @@ OPTIONS
the end of perf.data.old and analyzes the perf.data from the
timestamp 3971.150589 to the end of perf.data.
--cpu:: Only diff samples for the list of CPUs provided. Multiple CPUs can
be provided as a comma-separated list with no space: 0,1. Ranges of
CPUs are specified with -: 0-2. Default is to report samples on all
CPUs.
COMPARISON
----------
The comparison is governed by the baseline file. The baseline perf.data

16
tools/perf/builtin-diff.c
View File

@ -83,6 +83,9 @@ static unsigned int sort_compute = 1;
static s64 compute_wdiff_w1;
static s64 compute_wdiff_w2;
static const char *cpu_list;
static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
enum {
COMPUTE_DELTA,
COMPUTE_RATIO,
@ -354,6 +357,11 @@ static int diff__process_sample_event(struct perf_tool *tool,
return -1;
}
if (cpu_list && !test_bit(sample->cpu, cpu_bitmap)) {
ret = 0;
goto out_put;
}
if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample, true)) {
pr_warning("problem incrementing symbol period, skipping event\n");
goto out_put;
@ -892,6 +900,13 @@ static int __cmd_diff(void)
goto out_delete;
}
if (cpu_list) {
ret = perf_session__cpu_bitmap(d->session, cpu_list,
cpu_bitmap);
if (ret < 0)
goto out_delete;
}
ret = perf_session__process_events(d->session);
if (ret) {
pr_err("Failed to process %s\n", d->data.path);
@ -969,6 +984,7 @@ static const struct option options[] = {
"How to display percentage of filtered entries", parse_filter_percentage),
OPT_STRING(0, "time", &pdiff.time_str, "str",
"Time span (time percent or absolute timestamp)"),
OPT_STRING(0, "cpu", &cpu_list, "cpu", "list of cpus to profile"),
OPT_END()
};