Commit-ID: 8c8a9b25b5de3f1eeac721cf34f4379e56d5d694 Gitweb: http://git.kernel.org/tip/8c8a9b25b5de3f1eeac721cf34f4379e56d5d694 Author: Anton Blanchard <anton@xxxxxxxxx> AuthorDate: Tue, 18 Jan 2011 21:44:04 +1100 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Wed, 19 Jan 2011 20:05:42 +0100 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@xxxxxxxxx> Acked-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Scott Wood <scottwood@xxxxxxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxxxxxxx> Cc: linuxppc-dev@xxxxxxxxxxxxxxxx Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> LKML-Reference: <20110118214404.2f42e634@kryten> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- 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 4dcf5f8..b0dc8f7 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; -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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