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perf/x86: Add support for sampling PEBS machine state registers

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PEBS can capture machine state regs at retiremnt of the sampled
instructions. When precise sampling is enabled on an event, PEBS
is used, so substitute the interrupted state with the PEBS state.
Note that not all registers are captured by PEBS. Those missing
are replaced by the interrupt state counter-parts.

Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1411559322-16548-3-git-send-email-eranian@google.com
Cc: cebbert.lkml@gmail.com
Cc: jolsa@redhat.com
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Stephane Eranian 2014-09-24 13:48:38 +02:00 committed by Ingo Molnar
parent 60e2364e60
commit aea48559ac
1 changed files with 23 additions and 0 deletions
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23
arch/x86/kernel/cpu/perf_event_intel_ds.c
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@ -886,6 +886,29 @@ static void __intel_pmu_pebs_event(struct perf_event *event,
regs.bp = pebs->bp;
regs.sp = pebs->sp;
if (sample_type & PERF_SAMPLE_REGS_INTR) {
regs.ax = pebs->ax;
regs.bx = pebs->bx;
regs.cx = pebs->cx;
regs.dx = pebs->dx;
regs.si = pebs->si;
regs.di = pebs->di;
regs.bp = pebs->bp;
regs.sp = pebs->sp;
regs.flags = pebs->flags;
#ifndef CONFIG_X86_32
regs.r8 = pebs->r8;
regs.r9 = pebs->r9;
regs.r10 = pebs->r10;
regs.r11 = pebs->r11;
regs.r12 = pebs->r12;
regs.r13 = pebs->r13;
regs.r14 = pebs->r14;
regs.r15 = pebs->r15;
#endif
}
if (event->attr.precise_ip > 1 && x86_pmu.intel_cap.pebs_format >= 2) {
regs.ip = pebs->real_ip;
regs.flags |= PERF_EFLAGS_EXACT;