diff options
| author | leilei.lin <leilei.lin@alibaba-inc.com> | 2017-08-09 08:29:21 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-08-10 12:08:40 +0200 |
| commit | fdccc3fb7a42ea4e4cd77d2fb8fa3a45c66ec0bf (patch) | |
| tree | 0bc643ab390edab5ded23a9fd381f058425a8438 /arch/h8300 | |
| parent | ab027620e95987b5f0145013090a109b4152d23b (diff) | |
perf/core: Reduce context switch overhead
Skip most of the PMU context switching overhead when ctx->nr_events is 0.
50% performance overhead was observed under an extreme testcase.
Signed-off-by: leilei.lin <leilei.lin@alibaba-inc.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@kernel.org
Cc: alexander.shishkin@linux.intel.com
Cc: eranian@gmail.com
Cc: jolsa@redhat.com
Cc: linxiulei@gmail.com
Cc: yang_oliver@hotmail.com
Link: http://lkml.kernel.org/r/20170809002921.69813-1-leilei.lin@alibaba-inc.com
[ Rewrote the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/h8300')
0 files changed, 0 insertions, 0 deletions