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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-06-10 13:40:57 +0200
committerIngo Molnar <mingo@elte.hu>2009-06-10 16:55:26 +0200
commitbd2b5b12849a3446abad0b25e920f86f5480b309 (patch)
treeb0eacf6002f2015c0483390619a3f874bcb7e7d2 /include
parentdc81081b2d9a6a9d64dad1bef1e5fc9fb660e53e (diff)
downloadop-kernel-dev-bd2b5b12849a3446abad0b25e920f86f5480b309.zip
op-kernel-dev-bd2b5b12849a3446abad0b25e920f86f5480b309.tar.gz
perf_counter: More aggressive frequency adjustment
Also employ the overflow handler to adjust the frequency, this results in a stable frequency in about 40~50 samples, instead of that many ticks. This also means we can start sampling at a sample period of 1 without running head-first into the throttle. It relies on sched_clock() to accurately measure the time difference between the overflow NMIs. Signed-off-by: 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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/perf_counter.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 3586df8..282d8cc 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -371,6 +371,7 @@ struct hw_perf_counter {
u64 freq_count;
u64 freq_interrupts;
+ u64 freq_stamp;
#endif
};
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