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Commit 8c8a9b25 authored by Anton Blanchard's avatar Anton Blanchard Committed by Ingo Molnar
Browse files

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: default avatarAnton Blanchard <anton@samba.org>
Acked-by: default avatarBenjamin 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: default avatarIngo Molnar <mingo@elte.hu>
parent 8550d7cb

arch/powerpc/kernel/perf_event_fsl_emb.c

+1 −0
Original line number Original line Diff line number Diff line
@@ -596,6 +596,7 @@ static void record_and_restart(struct perf_event *event, unsigned long val, 
			if (left <= 0)

			if (left <= 0)

				left = period;

				left = period;

			record = 1;

			record = 1;

			event->hw.last_period = event->hw.sample_period;

		}

		}

		if (left < 0x80000000LL)

		if (left < 0x80000000LL)

			val = 0x80000000LL - left;

			val = 0x80000000LL - left;