Messages in this thread Patch in this message | | | From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 10/23] perf stat: Use affinity for enabling/disabling events | Date | Tue, 3 Dec 2019 10:55:53 -0300 |
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From: Andi Kleen <ak@linux.intel.com>
Restructure event enabling/disabling to use affinity, which minimizes the number of IPIs needed.
Before on a large test case with 94 CPUs:
% time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 54.65 1.899986 22 84812 660 ioctl
after:
39.21 0.930451 10 84796 644 ioctl
Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: http://lore.kernel.org/lkml/20191121001522.180827-13-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/evlist.c | 40 +++++++++++++++++++++++++++++++++++++--- 1 file changed, 37 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 096a4ea65b1b..1548237b6558 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -378,11 +378,28 @@ bool evsel__cpu_iter_skip(struct evsel *ev, int cpu) void evlist__disable(struct evlist *evlist) { struct evsel *pos; + struct affinity affinity; + int cpu, i; + + if (affinity__setup(&affinity) < 0) + return; + + evlist__for_each_cpu(evlist, i, cpu) { + affinity__set(&affinity, cpu); + evlist__for_each_entry(evlist, pos) { + if (evsel__cpu_iter_skip(pos, cpu)) + continue; + if (pos->disabled || !perf_evsel__is_group_leader(pos) || !pos->core.fd) + continue; + evsel__disable_cpu(pos, pos->cpu_iter - 1); + } + } + affinity__cleanup(&affinity); evlist__for_each_entry(evlist, pos) { - if (pos->disabled || !perf_evsel__is_group_leader(pos) || !pos->core.fd) + if (!perf_evsel__is_group_leader(pos) || !pos->core.fd) continue; - evsel__disable(pos); + pos->disabled = true; } evlist->enabled = false; @@ -391,11 +408,28 @@ void evlist__disable(struct evlist *evlist) void evlist__enable(struct evlist *evlist) { struct evsel *pos; + struct affinity affinity; + int cpu, i; + if (affinity__setup(&affinity) < 0) + return; + + evlist__for_each_cpu(evlist, i, cpu) { + affinity__set(&affinity, cpu); + + evlist__for_each_entry(evlist, pos) { + if (evsel__cpu_iter_skip(pos, cpu)) + continue; + if (!perf_evsel__is_group_leader(pos) || !pos->core.fd) + continue; + evsel__enable_cpu(pos, pos->cpu_iter - 1); + } + } + affinity__cleanup(&affinity); evlist__for_each_entry(evlist, pos) { if (!perf_evsel__is_group_leader(pos) || !pos->core.fd) continue; - evsel__enable(pos); + pos->disabled = false; } evlist->enabled = true; -- 2.21.0
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