linux-kernel - [PATCH v2 1/2] perf tools: add event modifier to request exclusive PMU access

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Date:	Mon, 22 Oct 2012 15:20:51 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	linux-kernel@...r.kernel.org
Cc:	peterz@...radead.org, mingo@...e.hu, ak@...ux.intel.com,
	acme@...hat.com, jolsa@...hat.com
Subject: [PATCH v2 1/2] perf tools: add event modifier to request exclusive PMU access

This patch adds the x modifier for events. It allows users to
request exclusive PMU access (attr->exclusive):

perf stat -e cycles:x ......
or
perf stat -e cpu/cycles/x ....

Exclusive mode is a feature of perf_events which was not yet
supported by the perf tool. Some events may require exclusive
PMU access (like on Intel SandyBridge).

In V2, we fixed the max repeat factor for the event
modifier. Must be 9 not 8.

Signed-off-by: Stephane Eranian <eranian@...gle.com>
---
 tools/perf/util/parse-events.c |    7 +++++++
 tools/perf/util/parse-events.l |    2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index aed38e4..aa73392 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -642,6 +642,7 @@ struct event_modifier {
 	int eG;
 	int precise;
 	int exclude_GH;
+	int exclusive;
 };
 
 static int get_event_modifier(struct event_modifier *mod, char *str,
@@ -656,6 +657,7 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
 
 	int exclude = eu | ek | eh;
 	int exclude_GH = evsel ? evsel->exclude_GH : 0;
+	int exclusive = evsel ? evsel->attr.exclusive : 0;
 
 	/*
 	 * We are here for group and 'GH' was not set as event
@@ -690,6 +692,8 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
 			eH = 0;
 		} else if (*str == 'p') {
 			precise++;
+		} else if (*str == 'x') {
+			exclusive = 1;
 		} else
 			break;
 
@@ -716,6 +720,8 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
 	mod->eG = eG;
 	mod->precise = precise;
 	mod->exclude_GH = exclude_GH;
+	mod->exclusive = exclusive;
+
 	return 0;
 }
 
@@ -741,6 +747,7 @@ int parse_events__modifier_event(struct list_head *list, char *str, bool add)
 		evsel->attr.precise_ip     = mod.precise;
 		evsel->attr.exclude_host   = mod.eH;
 		evsel->attr.exclude_guest  = mod.eG;
+		evsel->attr.exclusive	   = mod.exclusive;
 		evsel->exclude_GH          = mod.exclude_GH;
 	}
 
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index c87efc1..9c8a06d 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -81,7 +81,7 @@ num_dec		[0-9]+
 num_hex		0x[a-fA-F0-9]+
 num_raw_hex	[a-fA-F0-9]+
 name		[a-zA-Z_*?][a-zA-Z0-9_*?]*
-modifier_event	[ukhpGH]{1,8}
+modifier_event	[ukhpGHx]{1,9}
 modifier_bp	[rwx]{1,3}
 
 %%
-- 
1.7.9.5

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