[lkml]   [2018]   [Mar]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 19/54] perf pmu: Support wildcards on pmu name in dynamic pmu events
From: Agustin Vega-Frias <>

Starting on v4.12 event parsing code for dynamic pmu events already
supports prefix-based matching of multiple pmus when creating dynamic
events. E.g., in a system with the following dynamic pmus:


passing mypmu/<config>/ as an event spec will result in the creation of
the event in all of the pmus. This change expands this matching through
the use of fnmatch so glob-like expressions can be used to create events
in multiple pmus. E.g., in the system described above if a user only
wants to create the event in mypmu_0 and mypmu_1, mypmu_[01]/<config>/
can be passed.

Signed-off-by: Agustin Vega-Frias <>
Acked-by: Andi Kleen <>
Acked-by: Jiri Olsa <>
Cc: Alexander Shishkin <>
Cc: Namhyung Kim <>
Cc: Peter Zijlstra <>
Cc: Timur Tabi <>
Change-Id: Icb25653fc5d5239c20f3bffdfdf4ab4c9c9bb20b
Signed-off-by: Arnaldo Carvalho de Melo <>
tools/perf/Documentation/perf-list.txt | 8 +++++++-
tools/perf/Documentation/perf-stat.txt | 13 +++++++++++++
tools/perf/util/parse-events.l | 2 +-
tools/perf/util/parse-events.y | 14 ++++++++++++--
4 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
index e2a897ae3596..2549c34a7895 100644
--- a/tools/perf/Documentation/perf-list.txt
+++ b/tools/perf/Documentation/perf-list.txt
@@ -141,7 +141,13 @@ on the first memory controller on socket 0 of a Intel Xeon system

Each memory controller has its own PMU. Measuring the complete system
bandwidth would require specifying all imc PMUs (see perf list output),
-and adding the values together.
+and adding the values together. To simplify creation of multiple events,
+prefix and glob matching is supported in the PMU name, and the prefix
+'uncore_' is also ignored when performing the match. So the command above
+can be expanded to all memory controllers by using the syntaxes:
+ perf stat -C 0 -a imc/cas_count_read/,imc/cas_count_write/ -I 1000 ...
+ perf stat -C 0 -a *imc*/cas_count_read/,*imc*/cas_count_write/ -I 1000 ...

This example measures the combined core power every second

diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 2b38e222016a..628026dbedc5 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -49,6 +49,13 @@ report::
parameters are defined by corresponding entries in

+ Note that the last two syntaxes support prefix and glob matching in
+ the PMU name to simplify creation of events accross multiple instances
+ of the same type of PMU in large systems (e.g. memory controller PMUs).
+ Multiple PMU instances are typical for uncore PMUs, so the prefix
+ 'uncore_' is also ignored when performing this match.
child tasks do not inherit counters
@@ -260,6 +267,12 @@ taskset.
Do not merge results from same PMUs.

+When multiple events are created from a single event alias, stat will,
+by default, aggregate the event counts and show the result in a single
+row. This option disables that behavior and shows the individual events
+and counts. Aliases are listed immediately after the Kernel PMU events
+by perf list.
Measure SMI cost if msr/aperf/ and msr/smi/ events are supported.

diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 655ecff636a8..a1a01b1ac8b8 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -175,7 +175,7 @@ bpf_source [^,{}]+\.c[a-zA-Z0-9._]*
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_*?.]*
+name [a-zA-Z_*?\[\]][a-zA-Z0-9_*?.\[\]]*
name_minus [a-zA-Z_*?][a-zA-Z0-9\-_*?.:]*
drv_cfg_term [a-zA-Z0-9_\.]+(=[a-zA-Z0-9_*?\.:]+)?
/* If you add a modifier you need to update check_modifier() */
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index e81a20ea8d7d..dedf184b5bed 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -8,6 +8,7 @@

#define YYDEBUG 1

+#include <fnmatch.h>
#include <linux/compiler.h>
#include <linux/list.h>
#include <linux/types.h>
@@ -234,6 +235,10 @@ PE_NAME opt_event_config
if (parse_events_add_pmu(_parse_state, list, $1, $2)) {
struct perf_pmu *pmu = NULL;
int ok = 0;
+ char *pattern;
+ if (asprintf(&pattern, "%s*", $1) < 0)

while ((pmu = perf_pmu__scan(pmu)) != NULL) {
char *name = pmu->name;
@@ -241,14 +246,19 @@ PE_NAME opt_event_config
if (!strncmp(name, "uncore_", 7) &&
strncmp($1, "uncore_", 7))
name += 7;
- if (!strncmp($1, name, strlen($1))) {
- if (parse_events_copy_term_list(orig_terms, &terms))
+ if (!fnmatch(pattern, name, 0)) {
+ if (parse_events_copy_term_list(orig_terms, &terms)) {
+ free(pattern);
+ }
if (!parse_events_add_pmu(_parse_state, list, pmu->name, terms))
+ free(pattern);
if (!ok)
 \ /
  Last update: 2018-03-08 21:04    [W:0.351 / U:2.656 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site