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Message-Id: <1444079018-31421-6-git-send-email-acme@kernel.org>
Date: Mon, 5 Oct 2015 18:03:27 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ingo Molnar <mingo@...nel.org>
Cc: linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
David Ahern <dsahern@...il.com>,
Don Zickus <dzickus@...hat.com>,
Kan Liang <kan.liang@...el.com>,
Namhyung Kim <namhyung@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 05/16] perf tools: Introduce 'P' modifier to request max precision
From: Jiri Olsa <jolsa@...nel.org>
The 'P' will cause the event to get maximum possible detected precise
level.
Following record:
$ perf record -e cycles:P ...
will detect maximum precise level for 'cycles' event and use it.
Commiter note:
Testing it:
$ perf record -e cycles:P usleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.013 MB perf.data (9 samples) ]
$ perf evlist
cycles:P
$ perf evlist -v
cycles:P: size: 112, { sample_period, sample_freq }: 4000, sample_type:
IP|TID|TIME|PERIOD, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1,
enable_on_exec: 1, task: 1, precise_ip: 2, sample_id_all: 1, mmap2: 1,
comm_exec: 1
$
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1444068369-20978-6-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/Documentation/perf-list.txt | 1 +
tools/perf/util/evsel.c | 3 +++
tools/perf/util/evsel.h | 1 +
tools/perf/util/parse-events.c | 8 +++++++-
tools/perf/util/parse-events.l | 2 +-
5 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
index ad60c6ea1997..79483f40e991 100644
--- a/tools/perf/Documentation/perf-list.txt
+++ b/tools/perf/Documentation/perf-list.txt
@@ -30,6 +30,7 @@ counted. The following modifiers exist:
G - guest counting (in KVM guests)
H - host counting (not in KVM guests)
p - precise level
+ P - use maximum detected precise level
S - read sample value (PERF_SAMPLE_READ)
D - pin the event to the PMU
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 0b1c289da36d..8be867ccefe9 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -882,6 +882,9 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
attr->clockid = opts->clockid;
}
+ if (evsel->precise_max)
+ perf_event_attr__set_max_precise_ip(attr);
+
/*
* Apply event specific term settings,
* it overloads any global configuration.
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 7906666580da..02a5fed8d924 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -111,6 +111,7 @@ struct perf_evsel {
bool system_wide;
bool tracking;
bool per_pkg;
+ bool precise_max;
/* parse modifier helper */
int exclude_GH;
int nr_members;
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 5d0cfce2599b..3ed8bf175163 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -923,6 +923,7 @@ struct event_modifier {
int eG;
int eI;
int precise;
+ int precise_max;
int exclude_GH;
int sample_read;
int pinned;
@@ -938,6 +939,7 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
int eG = evsel ? evsel->attr.exclude_guest : 0;
int eI = evsel ? evsel->attr.exclude_idle : 0;
int precise = evsel ? evsel->attr.precise_ip : 0;
+ int precise_max = 0;
int sample_read = 0;
int pinned = evsel ? evsel->attr.pinned : 0;
@@ -974,6 +976,8 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
/* use of precise requires exclude_guest */
if (!exclude_GH)
eG = 1;
+ } else if (*str == 'P') {
+ precise_max = 1;
} else if (*str == 'S') {
sample_read = 1;
} else if (*str == 'D') {
@@ -1004,6 +1008,7 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
mod->eG = eG;
mod->eI = eI;
mod->precise = precise;
+ mod->precise_max = precise_max;
mod->exclude_GH = exclude_GH;
mod->sample_read = sample_read;
mod->pinned = pinned;
@@ -1020,7 +1025,7 @@ static int check_modifier(char *str)
char *p = str;
/* The sizeof includes 0 byte as well. */
- if (strlen(str) > (sizeof("ukhGHpppSDI") - 1))
+ if (strlen(str) > (sizeof("ukhGHpppPSDI") - 1))
return -1;
while (*p) {
@@ -1059,6 +1064,7 @@ int parse_events__modifier_event(struct list_head *list, char *str, bool add)
evsel->attr.exclude_idle = mod.eI;
evsel->exclude_GH = mod.exclude_GH;
evsel->sample_read = mod.sample_read;
+ evsel->precise_max = mod.precise_max;
if (perf_evsel__is_group_leader(evsel))
evsel->attr.pinned = mod.pinned;
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index c29832bce496..be244573a02e 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -122,7 +122,7 @@ num_raw_hex [a-fA-F0-9]+
name [a-zA-Z_*?][a-zA-Z0-9_*?.]*
name_minus [a-zA-Z_*?][a-zA-Z0-9\-_*?.]*
/* If you add a modifier you need to update check_modifier() */
-modifier_event [ukhpGHSDI]+
+modifier_event [ukhpPGHSDI]+
modifier_bp [rwx]{1,3}
%%
--
2.1.0
--
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