diff options
| author | Anton Blanchard <anton@samba.org> | 2011-01-18 11:44:04 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-01-19 20:05:42 +0100 |
| commit | 8c8a9b25b5de3f1eeac721cf34f4379e56d5d694 (patch) | |
| tree | 0f5e358671240dac4c0c2eec011b35454ca7d97f /arch | |
| parent | perf: Fix perf_event_init_task()/perf_event_free_task() interaction (diff) | |
| download | linux-8c8a9b25b5de3f1eeac721cf34f4379e56d5d694.tar.xz linux-8c8a9b25b5de3f1eeac721cf34f4379e56d5d694.zip | |
powerpc, perf: Fix frequency calculation for overflowing counters (FSL version)
When fixing the frequency calculations for perf on powerpc I
forgot to fix the FSL version.
If we dont set event->hw.last_period the frequency to period
calculations in perf go haywire and we continually
throttle/unthrottle the PMU.
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20110118214404.2f42e634@kryten>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/perf_event_fsl_emb.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/perf_event_fsl_emb.c b/arch/powerpc/kernel/perf_event_fsl_emb.c index 4dcf5f831e9d..b0dc8f7069cd 100644 --- a/arch/powerpc/kernel/perf_event_fsl_emb.c +++ b/arch/powerpc/kernel/perf_event_fsl_emb.c @@ -596,6 +596,7 @@ static void record_and_restart(struct perf_event *event, unsigned long val, if (left <= 0) left = period; record = 1; + event->hw.last_period = event->hw.sample_period; } if (left < 0x80000000LL) val = 0x80000000LL - left; |