lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:	Thu, 18 Sep 2014 22:20:18 -0700
From:	tip-bot for Adrian Hunter <>
Subject: [tip:perf/core] perf tools:
  Let a user specify a PMU event without any config terms

Commit-ID:  ad96227349901838e1a7f96f1dc22d96a97520c0
Author:     Adrian Hunter <>
AuthorDate: Fri, 15 Aug 2014 22:08:40 +0300
Committer:  Arnaldo Carvalho de Melo <>
CommitDate: Wed, 17 Sep 2014 17:08:08 -0300

perf tools: Let a user specify a PMU event without any config terms

This enables a PMU event to be specified in the form:


which is effectively the same as:


This patch is a precursor to defining default config for a PMU.

Further explanation extracted from lkml thread:

Imagine that the 'tsc' term did not exist.

Intel PT trace data would not contain TSC packets, and the decoder would
not know how to decode them.

Then imagine that a new version of the hardware adds 'tsc'.

It is such a useful feature that we want it by default, but older
versions of the tools don't know how to decode it, so the kernel cannot
turn it on by default.

It is similar to why the kernel does not select perf_event_attr.mmap2 by

The kernel doesn't know whether the tool supports it.

Signed-off-by: Adrian Hunter <>
Cc: David Ahern <>
Cc: Frederic Weisbecker <>
Cc: Jiri Olsa <>
Cc: Namhyung Kim <>
Cc: Paul Mackerras <>
Cc: Peter Zijlstra <>
Cc: Stephane Eranian <>
Signed-off-by: Arnaldo Carvalho de Melo <>
 tools/perf/util/parse-events.c |  6 ++++++
 tools/perf/util/parse-events.y | 10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index e34c81a..e756288 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -645,6 +645,12 @@ int parse_events_add_pmu(struct list_head *list, int *idx,
 	memset(&attr, 0, sizeof(attr));
+	if (!head_config) {
+		attr.type = pmu->type;
+		evsel = __add_event(list, idx, &attr, NULL, pmu->cpus);
+		return evsel ? 0 : -ENOMEM;
+	}
 	if (perf_pmu__check_alias(pmu, head_config, &unit, &scale))
 		return -EINVAL;
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 0bc87ba..55fab6a 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -210,6 +210,16 @@ PE_NAME '/' event_config '/'
 	$$ = list;
+PE_NAME '/' '/'
+	struct parse_events_evlist *data = _data;
+	struct list_head *list;
+	ALLOC_LIST(list);
+	ABORT_ON(parse_events_add_pmu(list, &data->idx, $1, NULL));
+	$$ = list;
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists