linux-kernel - [PATCH 08/31] perf, x86: Report PEBS event in a raw format

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Date:	Thu, 27 Sep 2012 21:31:13 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, a.p.zijlstra@...llo.nl, eranian@...gle.com,
	acme@...hat.com, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 08/31] perf, x86: Report PEBS event in a raw format

From: Andi Kleen <ak@...ux.intel.com>

Add support for reporting PEBS records in a raw format that can
be then parsed by perf script.

We exposed most of the Haswell PEBS fields in a generic way
in this patchkit:
- Aborted cycles is in weight
- Memory latency is in weight
- DataLA is in address
- EventingRIP is used for precise ip
- tsx_tuning and some bits of the abort code in RAX are
mapped to transaction flags

Left over are the general registers. We need them for some analysis
too: for example for loop trip count and string instruction trip
count sampling.

There isn't really any good way to generalize general registers.
Obviously they are different for every architecture.

So patch exports the RAW PEBS record when requested.

With the new perf script infrastructure that was recently added
it is reasonably easy and clean to process with script.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/kernel/cpu/perf_event_intel_ds.c |    7 +++++++
 1 files changed, 7 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 994156f..5b60dcf 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -586,6 +586,7 @@ static void __intel_pmu_pebs_event(struct perf_event *event,
 	struct pebs_record_core *pebs = __pebs;
 	struct perf_sample_data data;
 	struct pt_regs regs;
+	struct perf_raw_record raw;
 
 	if (!intel_pmu_save_and_restart(event))
 		return;
@@ -616,6 +617,12 @@ static void __intel_pmu_pebs_event(struct perf_event *event,
 	else
 		regs.flags &= ~PERF_EFLAGS_EXACT;
 
+	if (event->attr.sample_type & PERF_SAMPLE_RAW) {
+		raw.size = x86_pmu.pebs_record_size;
+		raw.data = __pebs;
+		data.raw = &raw;
+	}
+
 	if (has_branch_stack(event))
 		data.br_stack = &cpuc->lbr_stack;
 
-- 
1.7.7.6

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