Messages in this thread Patch in this message | | | From | Anshuman Khandual <> | Subject | [PATCH] powerpc, perf: Clear out branch entries to avoid any previous stale values | Date | Mon, 6 May 2013 13:34:40 +0530 |
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The 'to' field inside branch entries might contain stale values from previous PMU interrupt instances which had indirect branches. So clear all the values before reading a fresh set of BHRB entries after a PMU interrupt.
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> --- arch/powerpc/perf/core-book3s.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c index c627843..09db68d 100644 --- a/arch/powerpc/perf/core-book3s.c +++ b/arch/powerpc/perf/core-book3s.c @@ -1590,6 +1590,8 @@ static void record_and_restart(struct perf_event *event, unsigned long val, if (event->attr.sample_type & PERF_SAMPLE_BRANCH_STACK) { struct cpu_hw_events *cpuhw; cpuhw = &__get_cpu_var(cpu_hw_events); + memset(cpuhw->bhrb_entries, 0, + sizeof(struct perf_branch_entry) * BHRB_MAX_ENTRIES); power_pmu_bhrb_read(cpuhw); data.br_stack = &cpuhw->bhrb_stack; } -- 1.7.11.7
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