]> git.karo-electronics.de Git - linux-beck.git/commit
perf_counter: Accurate period data
authorPeter Zijlstra <a.p.zijlstra@chello.nl>
Wed, 10 Jun 2009 19:34:59 +0000 (21:34 +0200)
committerIngo Molnar <mingo@elte.hu>
Thu, 11 Jun 2009 00:39:02 +0000 (02:39 +0200)
commit9e350de37ac9607012fcf9c5314a28fbddf8f43c
treed0f311bcf49d887e6d488ea72b2913cb00eaf910
parentdf1a132bf3d3508f863336c80a27806a2ac947e0
perf_counter: Accurate period data

We currently log hw.sample_period for PERF_SAMPLE_PERIOD, however this is
incorrect. When we adjust the period, it will only take effect the next
cycle but report it for the current cycle. So when we adjust the period
for every cycle, we're always wrong.

Solve this by keeping track of the last_period.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/powerpc/kernel/perf_counter.c
arch/x86/kernel/cpu/perf_counter.c
include/linux/perf_counter.h
kernel/perf_counter.c