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perf events: Precalculate the header space for PERF_SAMPLE_ fields

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PERF_SAMPLE_{CALLCHAIN,RAW} have variable lenghts per sample, but the others
can be precalculated, reducing a bit the per sample cost.

Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Ian Munsie <imunsie@au1.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2010-10-20 12:50:11 -02:00
parent 068ffaa8bf
commit c320c7b7d3
2 changed files with 93 additions and 59 deletions
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2
include/linux/perf_event.h
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@ -758,6 +758,8 @@ struct perf_event {
u64 shadow_ctx_time;
struct perf_event_attr attr;
u16 header_size;
u16 read_size;
struct hw_perf_event hw;
struct perf_event_context *ctx;