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authorJin Yao <yao.jin@linux.intel.com>2019-03-05 16:05:42 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2019-03-07 00:05:21 +0300
commitdaca23b2007595b6a48255ca08c763f56050d1c5 (patch)
treeae8ef6d1a59f558901c0cba4928f66306e2dce0b /tools/perf/builtin-diff.c
parent4802138d78caed36cee2a859f77fb2035f230018 (diff)
downloadlinux-daca23b2007595b6a48255ca08c763f56050d1c5.tar.xz
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>
Diffstat (limited to 'tools/perf/builtin-diff.c')
-rw-r--r--tools/perf/builtin-diff.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 17cd898074c8..dfe6c7606f5a 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -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()
};