[PATCH -tip v3 2/5] perf: change perf_event_header.misc toPERF_RECORD_MISC_USER for BTS

From: Akihiro Nagai
Date: Thu Aug 11 2011 - 08:05:55 EST

Change perf_event_headder.misc to PERF_RECORD_MISC_USER for
BTS records, because BTS traces both kernel and user spaces
nevertheless perf specifies to trace only kernel or user space.

Signed-off-by: Akihiro Nagai <akihiro.nagai.hw@xxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>

arch/x86/kernel/cpu/perf_event_intel_ds.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 1b1ef3a..323f3f0 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -340,6 +340,14 @@ static int intel_pmu_drain_bts_buffer(void)
perf_prepare_sample(&header, &data, event, &regs);

+ /*
+ * Since BTS can not trace kernel and user space separately, set
+ * PERF_RECORD_MISC_USER in header.misc to resolve both kernel and
+ * user DSOs and symbols.
+ */
+ header.misc |= PERF_RECORD_MISC_USER;
if (perf_output_begin(&handle, event, header.size * (top - at)))
return 1;

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