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perf/x86-ibs: Fix update of period

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The last sw period was not correctly updated on overflow and thus led
to wrong distribution of events. We always need to properly initialize
data.period in struct perf_sample_data.

Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1333390758-10893-2-git-send-email-robert.richter@amd.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Robert Richter 2012-04-02 20:19:07 +02:00 committed by Ingo Molnar
parent ad8537cda6
commit c75841a398
1 changed files with 14 additions and 13 deletions
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27
arch/x86/kernel/cpu/perf_event_amd_ibs.c
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@ -386,7 +386,21 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs)
if (!(*buf++ & perf_ibs->valid_mask))
return 0;
/*
* Emulate IbsOpCurCnt in MSRC001_1033 (IbsOpCtl), not
* supported in all cpus. As this triggered an interrupt, we
* set the current count to the max count.
*/
config = ibs_data.regs[0];
if (perf_ibs == &perf_ibs_op && !(ibs_caps & IBS_CAPS_RDWROPCNT)) {
config &= ~IBS_OP_CUR_CNT;
config |= (config & IBS_OP_MAX_CNT) << 36;
}
perf_ibs_event_update(perf_ibs, event, config);
perf_sample_data_init(&data, 0);
data.period = event->hw.last_period;
if (event->attr.sample_type & PERF_SAMPLE_RAW) {
ibs_data.caps = ibs_caps;
size = 1;
@ -405,19 +419,6 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs)
regs = *iregs; /* XXX: update ip from ibs sample */
/*
* Emulate IbsOpCurCnt in MSRC001_1033 (IbsOpCtl), not
* supported in all cpus. As this triggered an interrupt, we
* set the current count to the max count.
*/
config = ibs_data.regs[0];
if (perf_ibs == &perf_ibs_op && !(ibs_caps & IBS_CAPS_RDWROPCNT)) {
config &= ~IBS_OP_CUR_CNT;
config |= (config & IBS_OP_MAX_CNT) << 36;
}
perf_ibs_event_update(perf_ibs, event, config);
overflow = perf_ibs_set_period(perf_ibs, hwc, &config);
reenable = !(overflow && perf_event_overflow(event, &data, &regs));
config = (config >> 4) | (reenable ? perf_ibs->enable_mask : 0);