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

[Akihiro Nagai <akihiro.nagai.hw@hitachi.com>]

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@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---

 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_CPUMODE_MASK;
+	header.misc |= PERF_RECORD_MISC_USER;
+
 	if (perf_output_begin(&handle, event, header.size * (top - at)))
 		return 1;