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H A D | evlist.c | 704e2f5b Wed Nov 20 18:15:22 CST 2019 Andi Kleen <ak@linux.intel.com> perf stat: Use affinity for enabling/disabling events
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> 704e2f5b Wed Nov 20 18:15:22 CST 2019 Andi Kleen <ak@linux.intel.com> perf stat: Use affinity for enabling/disabling events 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>
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