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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
	linux-kernel@vger.kernel.org, Namhyung Kim <namhyung@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Hemant Kumar <hemant@linux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>,
	Brendan Gregg <brendan.d.gregg@gmail.com>
Subject: [PATCH perf/core v11 12/20] perf probe: Add group name support
Date: Wed, 15 Jun 2016 12:29:34 +0900	[thread overview]
Message-ID: <20160615032934.31330.7254.stgit@devbox> (raw)
In-Reply-To: <20160615032728.31330.45150.stgit@devbox>

From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>

Allow user to set group name for adding new event.
Note that user must ensure that the group name doesn't
conflict with existing group name carefully.
E.g. Existing group name can conflict with other events.
Especially, using the group name reserved for kernel
modules can hide kernel embedded events when loading
modules.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 Changes in v4:
  - Update Documentation/perf-probe.txt too.
---
 tools/perf/Documentation/perf-probe.txt |   10 ++++++----
 tools/perf/util/probe-event.c           |   23 ++++++++++++++---------
 2 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index 8d09173..7a258e9 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -143,16 +143,18 @@ PROBE SYNTAX
 Probe points are defined by following syntax.
 
     1) Define event based on function name
-     [EVENT=]FUNC[@SRC][:RLN|+OFFS|%return|;PTN] [ARG ...]
+     [[GROUP:]EVENT=]FUNC[@SRC][:RLN|+OFFS|%return|;PTN] [ARG ...]
 
     2) Define event based on source file with line number
-     [EVENT=]SRC:ALN [ARG ...]
+     [[GROUP:]EVENT=]SRC:ALN [ARG ...]
 
     3) Define event based on source file with lazy pattern
-     [EVENT=]SRC;PTN [ARG ...]
+     [[GROUP:]EVENT=]SRC;PTN [ARG ...]
 
 
-'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. Currently, event group name is set as 'probe'.
+'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. You can also specify a group name by 'GROUP', if omitted, set 'probe' is used for kprobe and 'probe_<bin>' is used for uprobe.
+Note that using existing group name can conflict with other events. Especially, using the group name reserved for kernel modules can hide embedded events in the
+modules.
 'FUNC' specifies a probed function name, and it may have one of the following options; '+OFFS' is the offset from function entry address in bytes, ':RLN' is the relative-line number from function entry line, and '%return' means that it probes function return. And ';PTN' means lazy matching pattern (see LAZY MATCHING). Note that ';PTN' must be the end of the probe point definition.  In addition, '@SRC' specifies a source file which has that function.
 It is also possible to specify a probe point by the source line number or lazy matching by using 'SRC:ALN' or 'SRC;PTN' syntax, where 'SRC' is the source file path, ':ALN' is the line number and ';PTN' is the lazy matching pattern.
 'ARG' specifies the arguments of this probe point, (see PROBE ARGUMENT).
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index fbb101d..ed50f15 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1208,10 +1208,8 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
 	bool file_spec = false;
 	/*
 	 * <Syntax>
-	 * perf probe [EVENT=]SRC[:LN|;PTN]
-	 * perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
-	 *
-	 * TODO:Group name support
+	 * perf probe [GRP:][EVENT=]SRC[:LN|;PTN]
+	 * perf probe [GRP:][EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
 	 */
 	if (!arg)
 		return -EINVAL;
@@ -1220,11 +1218,19 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
 	if (ptr && *ptr == '=') {	/* Event name */
 		*ptr = '\0';
 		tmp = ptr + 1;
-		if (strchr(arg, ':')) {
-			semantic_error("Group name is not supported yet.\n");
-			return -ENOTSUP;
-		}
+		ptr = strchr(arg, ':');
+		if (ptr) {
+			*ptr = '\0';
+			if (!is_c_func_name(arg))
+				goto not_fname;
+			pev->group = strdup(arg);
+			if (!pev->group)
+				return -ENOMEM;
+			arg = ptr + 1;
+		} else
+			pev->group = NULL;
 		if (!is_c_func_name(arg)) {
+not_fname:
 			semantic_error("%s is bad for event name -it must "
 				       "follow C symbol-naming rule.\n", arg);
 			return -EINVAL;
@@ -1232,7 +1238,6 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
 		pev->event = strdup(arg);
 		if (pev->event == NULL)
 			return -ENOMEM;
-		pev->group = NULL;
 		arg = tmp;
 	}
 

  parent reply	other threads:[~2016-06-15  3:29 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-15  3:27 [PATCH perf/core v11 00/20] perf-probe --cache and SDT support Masami Hiramatsu
2016-06-15  3:27 ` [PATCH perf/core v11 01/20] perf: util: Fix rm_rf() to handle non-regular files correctly Masami Hiramatsu
2016-06-15  3:27 ` [PATCH perf/core v11 02/20] perf-probe: Fix to add NULL check for strndup Masami Hiramatsu
2016-06-15  3:28 ` [PATCH perf/core v11 03/20] perf-buildid: Rename and export build_id_cache__cachedir() Masami Hiramatsu
2016-06-15  3:28 ` [PATCH perf/core v11 04/20] perf probe: Add perf_probe_event__copy() Masami Hiramatsu
2016-06-15  3:28 ` [PATCH perf/core v11 05/20] perf probe: Recover and export synthesize_perf_probe_point() Masami Hiramatsu
2016-06-15  3:28 ` [PATCH perf/core v11 06/20] perf probe-file: Introduce perf_cache interfaces Masami Hiramatsu
2016-06-16  8:39   ` [tip:perf/core] perf probe: " tip-bot for Masami Hiramatsu
2016-06-15  3:28 ` [PATCH perf/core v11 07/20] perf probe: Add --cache option to cache the probe definitions Masami Hiramatsu
2016-06-15 17:38   ` Arnaldo Carvalho de Melo
2016-06-15 21:38     ` Masami Hiramatsu
2016-06-16 14:29       ` Arnaldo Carvalho de Melo
2016-06-16 23:48         ` Masami Hiramatsu
2016-06-16  8:39   ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2016-06-15  3:28 ` [PATCH perf/core v11 08/20] perf probe: Use cache entry if possible Masami Hiramatsu
2016-06-15  3:29 ` [PATCH perf/core v11 09/20] perf probe: Show all cached probes Masami Hiramatsu
2016-06-15  3:29 ` [PATCH perf/core v11 10/20] perf probe: Remove caches when --cache is given Masami Hiramatsu
2016-06-15  3:29 ` [PATCH perf/core v11 11/20] perf/sdt: ELF support for SDT Masami Hiramatsu
2016-06-15  3:29 ` Masami Hiramatsu [this message]
2016-06-15  3:29 ` [PATCH perf/core v11 13/20] perf buildid-cache: Scan and import user SDT events to probe cache Masami Hiramatsu
2016-06-15  3:29 ` [PATCH perf/core v11 14/20] perf probe: Accept %sdt and %cached event name Masami Hiramatsu
2016-06-15  3:30 ` [PATCH perf/core v11 15/20] perf-list: Show SDT and pre-cached events Masami Hiramatsu
2016-06-15  3:30 ` [PATCH perf/core v11 16/20] perf-list: Skip SDTs placed in invalid binaries Masami Hiramatsu
2016-06-15  3:30 ` [PATCH perf/core v11 17/20] perf: probe-cache: Add for_each_probe_cache_entry() wrapper Masami Hiramatsu
2016-06-15  3:30 ` [PATCH perf/core v11 18/20] perf probe: Allow wildcard for cached events Masami Hiramatsu
2016-06-15  3:30 ` [PATCH perf/core v11 19/20] perf probe: Search SDT/cached event from all probe caches Masami Hiramatsu
2016-06-15  3:30 ` [PATCH perf/core v11 20/20] perf probe: Support @BUILDID or @FILE suffix for SDT events Masami Hiramatsu

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