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perf stat: Use affinity for reading

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Restructure event reading to use affinity to minimize the number of IPIs
needed.

Before on a large test case with 94 CPUs:

  % time     seconds  usecs/call     calls    errors syscall
  ------ ----------- ----------- --------- --------- ----------------
    3.16    0.106079           4     22082           read

After:

    3.43    0.081295           3     22082           read

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lore.kernel.org/lkml/20191121001522.180827-11-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Andi Kleen
2019-11-20 16:15:20 -08:00
committed by Arnaldo Carvalho de Melo
parent 4804e01116
commit 4b49ab708d
2 changed files with 56 additions and 40 deletions
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1
tools/perf/util/evsel.h
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@@ -86,6 +86,7 @@ struct evsel {
struct list_head config_terms;
struct bpf_object *bpf_obj;
int bpf_fd;
int err;
bool auto_merge_stats;
bool merged_stat;
const char * metric_expr;