linux-kernel - [PATCH] perf: Add missing user space support for config1/config2 v2

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Date:	Tue, 12 Apr 2011 18:30:03 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	Andi Kleen <ak@...ux.intel.com>, ming.m.lin@...el.com,
	peterz@...radead.org, mingo@...e.hu, eranian@...il.com
Subject: [PATCH] perf: Add missing user space support for config1/config2 v2

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

Updated version that avoids warning/-Werror on some gcc versions
I didn't test initially. Ceterum censeo -Werror esse delendam.

-Andi

---

The offcore_msr perf kernel code was merged into 2.6.39-rc*,
but the user space bits were not. This made it impossible
to set the extra mask and actually do the OFFCORE profiling

This patch fixes this. It adds a new syntax ':' to raw events
to specify additional event masks. I also added support
for setting config2, even though that is not needed currently.

[Note: the original version back in time used , -- but that
actually conflicted with event lists, so now it's :]

Cc: ming.m.lin@...el.com
Cc: peterz@...radead.org
Cc: mingo@...e.hu
Cc: eranian@...il.com
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/Documentation/perf-list.txt |   11 +++++++++++
 tools/perf/util/parse-events.c         |   18 +++++++++++++++++-
 2 files changed, 28 insertions(+), 1 deletions(-)

diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
index 7a527f7..5a43169 100644
--- a/tools/perf/Documentation/perf-list.txt
+++ b/tools/perf/Documentation/perf-list.txt
@@ -61,6 +61,17 @@ raw encoding of 0x1A8 can be used:
 You should refer to the processor specific documentation for getting these
 details. Some of them are referenced in the SEE ALSO section below.
 
+Some raw events -- like the Intel OFFCORE events -- support additional 
+parameters. These can be appended after a ':'.
+
+For example on a multi socket Intel Nehalem:
+
+ perf stat -e r1b7:20ff -a sleep 1
+
+Profile the OFFCORE_RESPONSE.ANY_REQUEST with event mask REMOTE_DRAM_0 
+that measures any access to DRAM on another socket.  Upto two parameters can 
+be specified with additional ':'
+
 OPTIONS
 -------
 
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 952b4ae..783be64 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -688,9 +688,25 @@ parse_raw_event(const char **strp, struct perf_event_attr *attr)
 		return EVT_FAILED;
 	n = hex2u64(str + 1, &config);
 	if (n > 0) {
-		*strp = str + n + 1;
+		str += n + 1;
 		attr->type = PERF_TYPE_RAW;
 		attr->config = config;
+		if (*str == ':') {
+			str++;
+			n = hex2u64(str, &config);
+			if (n == 0)
+				return EVT_FAILED;
+			attr->config1 = config;
+			str += n;
+			if (*str == ':') {
+				str++;
+				n = hex2u64(str + 1, &config);
+				if (n == 0)
+					return EVT_FAILED;
+				attr->config2 = config;
+			}
+		}	
+		*strp = str;
 		return EVT_HANDLED;
 	}
 	return EVT_FAILED;
-- 
1.7.4.2

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