linux-kernel - [PATCH perf/core 2/8] [BUGFIX] perf probe: Remove all probes matches given pattern at once

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Date:	Tue, 21 Apr 2015 20:42:00 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>, namhyung@...nel.org,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>
Subject: [PATCH perf/core 2/8] [BUGFIX] perf probe: Remove all probes
 matches given pattern at once

Fix perf-probe --del option to delete all matched probes in both
of kprobes and uprobes at once.

When we have 2 or more events on different binaries as below,

  ----
  # ./perf probe -l
  probe:vfs_read       (on vfs_read@...c/linux-3/fs/read_write.c)
  probe_libc:malloc    (on __libc_malloc@...loc/malloc.c in /usr/lib64/libc-2.17
  ----

Trying to remove all event with '*' just removes kprobe events at first.
  ----
  # ./perf probe -d \*
  Removed event: probe:vfs_read
  ----

And in 2nd try, it removes all uprobe events.
  ----
  # ./perf probe -d \*
  Removed event: probe_libc:malloc
  ----

This fixes to remove all event at once as below.
  ----
  # ./perf probe -d \*
  Removed event: probe:vfs_read
  Removed event: probe_libc:malloc
  ----

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Reported-by: Arnaldo Carvalho de Melo <acme@...nel.org>
---
 tools/perf/util/probe-event.c |   17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index d8bb616..cae1fd7 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2710,7 +2710,7 @@ static int del_trace_probe_event(int fd, const char *buf,
 
 int del_perf_probe_events(struct strlist *dellist)
 {
-	int ret = -1, ufd = -1, kfd = -1;
+	int ret = -1, ret2, ufd = -1, kfd = -1;
 	char buf[128];
 	const char *group, *event;
 	char *p, *str;
@@ -2731,8 +2731,10 @@ int del_perf_probe_events(struct strlist *dellist)
 		goto error;
 	}
 
-	if (namelist == NULL && unamelist == NULL)
+	if (namelist == NULL && unamelist == NULL) {
+		ret = -ENOENT;
 		goto error;
+	}
 
 	strlist__for_each(ent, dellist) {
 		str = strdup(ent->s);
@@ -2760,14 +2762,17 @@ int del_perf_probe_events(struct strlist *dellist)
 
 		pr_debug("Group: %s, Event: %s\n", group, event);
 
+		ret = ret2 = -ENOENT;
 		if (namelist)
 			ret = del_trace_probe_event(kfd, buf, namelist);
 
-		if (unamelist && ret != 0)
-			ret = del_trace_probe_event(ufd, buf, unamelist);
+		if (unamelist)
+			ret2 = del_trace_probe_event(ufd, buf, unamelist);
 
-		if (ret != 0)
-			pr_info("Info: Event \"%s\" does not exist.\n", buf);
+		/* Since we can remove probes which already removed, no error  */
+		if (ret != 0 && ret2 != 0)
+			pr_debug("Event \"%s\" does not exist.\n", buf);
+		ret = 0;
 
 		free(str);
 	}

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