linux-kernel - [PATCH v3 11/23] perf: Add itrace

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Date:	Mon, 11 Aug 2014 08:19:40 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Robert Richter <rric@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>, kan.liang@...el.com,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH v3 11/23] perf: Add itrace_config to the event attribute

To configure itrace events, we use a separate config field in the attribute,
which can be used by normal and sampling counters. The latter will use config
to specify the actual event and itrace_config for itrace configuration that
will be used for sampling.

Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 include/linux/perf_event.h      | 1 +
 include/uapi/linux/perf_event.h | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 94961c73e0..cb8c92e041 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -173,6 +173,7 @@ struct perf_event;
 #define PERF_PMU_CAP_AUX_NO_SG			0x02
 #define PERF_PMU_CAP_AUX_SW_DOUBLEBUF		0x04
 #define PERF_PMU_CAP_EXCLUSIVE			0x08
+#define PERF_PMU_CAP_ITRACE			0x10
 
 /**
  * struct pmu - generic performance monitoring unit
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 507b5e1f5b..b14b1f57c1 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -239,6 +239,7 @@ enum perf_event_read_format {
 #define PERF_ATTR_SIZE_VER3	96	/* add: sample_regs_user */
 					/* add: sample_stack_user */
 					/* add: aux_watermark */
+#define PERF_ATTR_SIZE_VER4	104	/* add: itrace_config */
 
 /*
  * Hardware event_id to monitor via a performance monitoring event:
@@ -337,6 +338,11 @@ struct perf_event_attr {
 	 * Wakeup watermark for AUX area
 	 */
 	__u32	aux_watermark;
+
+	/*
+	 * Itrace pmus' event config
+	 */
+	__u64	itrace_config;
 };
 
 #define perf_flags(attr)	(*(&(attr)->read_format + 1))
-- 
2.1.0.rc1

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