linux-kernel - [PATCH 1/4] perf: Add memory load/store events generic code

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Message-Id: <1309766525-14089-2-git-send-email-ming.m.lin@intel.com>
Date:	Mon,  4 Jul 2011 08:02:02 +0000
From:	Lin Ming <ming.m.lin@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/4] perf: Add memory load/store events generic code

Add generic memory load/store events: PERF_COUNT_HW_MEM_{LOAD, STORE}
Add generic memory load/store operation encoding.
Add code to handle memory operation data.

Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
 include/linux/perf_event.h |   44 +++++++++++++++++++++++++++++++++++++++++++-
 kernel/events/core.c       |   12 ++++++++++++
 2 files changed, 55 insertions(+), 1 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index e76a410..c410ae4 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -54,6 +54,8 @@ enum perf_hw_id {
 	PERF_COUNT_HW_BUS_CYCLES		= 6,
 	PERF_COUNT_HW_STALLED_CYCLES_FRONTEND	= 7,
 	PERF_COUNT_HW_STALLED_CYCLES_BACKEND	= 8,
+	PERF_COUNT_HW_MEM_LOAD			= 9,
+	PERF_COUNT_HW_MEM_STORE			= 10,
 
 	PERF_COUNT_HW_MAX,			/* non-ABI */
 };
@@ -127,8 +129,10 @@ enum perf_event_sample_format {
 	PERF_SAMPLE_PERIOD			= 1U << 8,
 	PERF_SAMPLE_STREAM_ID			= 1U << 9,
 	PERF_SAMPLE_RAW				= 1U << 10,
+	PERF_SAMPLE_LATENCY			= 1U << 11,
+	PERF_SAMPLE_EXTRA			= 1U << 12,
 
-	PERF_SAMPLE_MAX = 1U << 11,		/* non-ABI */
+	PERF_SAMPLE_MAX = 1U << 13,		/* non-ABI */
 };
 
 /*
@@ -432,6 +436,8 @@ enum perf_event_type {
 	 *	{ u64			stream_id;} && PERF_SAMPLE_STREAM_ID
 	 *	{ u32			cpu, res; } && PERF_SAMPLE_CPU
 	 *	{ u64			period;   } && PERF_SAMPLE_PERIOD
+	 *	{ u64			latency;  } && PERF_SAMPLE_LATENCY
+	 *	{ u64			extra;    } && PERF_SAMPLE_EXTRA
 	 *
 	 *	{ struct read_format	values;	  } && PERF_SAMPLE_READ
 	 *
@@ -474,6 +480,40 @@ enum perf_callchain_context {
 #define PERF_FLAG_FD_OUTPUT		(1U << 1)
 #define PERF_FLAG_PID_CGROUP		(1U << 2) /* pid=cgroup id, per-cpu mode only */
 
+/*
+ * Memory load operation info encoding
+ */
+
+/* Bits(0-1) {L1, L2, L3, RAM} or {unknown, IO, uncached, reserved} */
+#define MEM_LOAD_L1			0x00
+#define MEM_LOAD_L2			0x01
+#define MEM_LOAD_L3			0x02
+#define MEM_LOAD_RAM			0x03
+#define MEM_LOAD_UNKNOWN		0x00
+#define MEM_LOAD_IO			0x01
+#define MEM_LOAD_UNCACHED		0x02
+#define MEM_LOAD_RESERVED		0x03
+
+/* Bits(2-3) {toggle, snoop, local, remote} */
+#define MEM_LOAD_TOGGLE			(0x00 << 2)
+#define MEM_LOAD_SNOOP			(0x01 << 2)
+#define MEM_LOAD_LOCAL			(0x02 << 2)
+#define MEM_LOAD_REMOTE			(0x03 << 2)
+
+/* Bits(4-5) {modified, exclusive, shared, invalid} */
+#define MEM_LOAD_MODIFIED		(0x00 << 4)
+#define MEM_LOAD_EXCLUSIVE		(0x01 << 4)
+#define MEM_LOAD_SHARED			(0x02 << 4)
+#define MEM_LOAD_INVALID		(0x03 << 4)
+
+/*
+ * Memory store operation info encoding
+ */
+
+#define MEM_STORE_DCU_HIT		(1ULL << 0)
+#define MEM_STORE_STLB_HIT		(1ULL << 1)
+#define MEM_STORE_LOCKED_ACCESS		(1ULL << 2)
+
 #ifdef __KERNEL__
 /*
  * Kernel-internal data types and definitions:
@@ -974,6 +1014,8 @@ struct perf_sample_data {
 		u32	reserved;
 	}				cpu_entry;
 	u64				period;
+	u64				latency;
+	u64				extra;
 	struct perf_callchain_entry	*callchain;
 	struct perf_raw_record		*raw;
 };
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 5e70f62..b835ef5 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -887,6 +887,12 @@ static void perf_event__header_size(struct perf_event *event)
 	if (sample_type & PERF_SAMPLE_PERIOD)
 		size += sizeof(data->period);
 
+	if (sample_type & PERF_SAMPLE_LATENCY)
+		size += sizeof(data->latency);
+
+	if (sample_type & PERF_SAMPLE_EXTRA)
+		size += sizeof(data->extra);
+
 	if (sample_type & PERF_SAMPLE_READ)
 		size += event->read_size;
 
@@ -3871,6 +3877,12 @@ void perf_output_sample(struct perf_output_handle *handle,
 	if (sample_type & PERF_SAMPLE_PERIOD)
 		perf_output_put(handle, data->period);
 
+	if (sample_type & PERF_SAMPLE_LATENCY)
+		perf_output_put(handle, data->latency);
+
+	if (sample_type & PERF_SAMPLE_EXTRA)
+		perf_output_put(handle, data->extra);
+
 	if (sample_type & PERF_SAMPLE_READ)
 		perf_output_read(handle, event);
 
-- 
1.7.5.1

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