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| author | Peter Zijlstra <peterz@infradead.org> | 2019-10-17 20:31:03 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-10-28 12:51:02 +0100 |
| commit | 66d258c5b048840991de49697264af75f5b09def (patch) | |
| tree | f42f5db64830e46d62bf422dcf6f3d4bc5065ff3 /security | |
| parent | db0503e4f6751f2c719d002ba1becd1811633e6e (diff) | |
| download | linux-66d258c5b048840991de49697264af75f5b09def.tar.bz2 | |
perf/core: Optimize perf_init_event()
Andi reported that he was hitting the linear search in
perf_init_event() a lot. Make more agressive use of the IDR lookup to
avoid hitting the linear search.
With exception of PERF_TYPE_SOFTWARE (which relies on a hideous hack),
we can put everything in the IDR. On top of that, we can alias
TYPE_HARDWARE and TYPE_HW_CACHE to TYPE_RAW on the lookup side.
This greatly reduces the chances of hitting the linear search.
Reported-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan <kan.liang@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'security')
0 files changed, 0 insertions, 0 deletions