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

From: Stephane Eranian
Date: Fri Oct 19 2012 - 10:55:32 EST


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).

Signed-off-by: Stephane Eranian <eranian@xxxxxxxxxx>
---
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]{1,8}
modifier_bp [rwx]{1,3}

%%
--
1.7.9.5

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