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From: tip-bot for Jiri Olsa <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: alexander.shishkin@linux.intel.com, mingo@kernel.org,
	acme@redhat.com, mpetlan@redhat.com, rostedt@goodmis.org,
	tglx@linutronix.de, namhyung@kernel.org, peterz@infradead.org,
	hpa@zytor.com, linux-kernel@vger.kernel.org, jolsa@kernel.org
Subject: [tip:perf/urgent] perf tools: Fix tracing_path_mount proper path
Date: Wed, 17 Oct 2018 23:19:08 -0700
Message-ID: <tip-yiwkzexq9fk1ey1xg3gnjlw4@git.kernel.org> (raw)
In-Reply-To: <20181016114818.3595-1-jolsa@kernel.org>

Commit-ID:  c458a6206d2a8600934617ccf88ba7d3a030faba
Gitweb:     https://git.kernel.org/tip/c458a6206d2a8600934617ccf88ba7d3a030faba
Author:     Jiri Olsa <jolsa@kernel.org>
AuthorDate: Tue, 16 Oct 2018 13:48:18 +0200
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 16 Oct 2018 12:27:46 -0300

perf tools: Fix tracing_path_mount proper path

If there's no tracefs (RHEL7) support the tracing_path_mount
returns debugfs path which results in following fail:

  # perf probe sys_write
  kprobe_events file does not exist - please rebuild kernel with CONFIG_KPROBE_EVENTS.
  Error: Failed to add events.

In tracing_path_debugfs_mount function we need to return the
'tracing' path instead of just the mount to make it work:

  # perf probe sys_write
  Added new event:
    probe:sys_write      (on sys_write)

  You can now use it in all perf tools, such as:

          perf record -e probe:sys_write -aR sleep 1

Adding the 'return tracing_path;' also to tracing_path_tracefs_mount
function just for consistency with tracing_path_debugfs_mount.

Upstream keeps working, because it has the tracefs support.

Link: http://lkml.kernel.org/n/tip-yiwkzexq9fk1ey1xg3gnjlw4@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Fixes: 23773ca18b39 ("perf tools: Make perf aware of tracefs")
Link: http://lkml.kernel.org/r/20181016114818.3595-1-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/lib/api/fs/tracing_path.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/lib/api/fs/tracing_path.c b/tools/lib/api/fs/tracing_path.c
index 120037496f77..5afb11b30fca 100644
--- a/tools/lib/api/fs/tracing_path.c
+++ b/tools/lib/api/fs/tracing_path.c
@@ -36,7 +36,7 @@ static const char *tracing_path_tracefs_mount(void)
 
 	__tracing_path_set("", mnt);
 
-	return mnt;
+	return tracing_path;
 }
 
 static const char *tracing_path_debugfs_mount(void)
@@ -49,7 +49,7 @@ static const char *tracing_path_debugfs_mount(void)
 
 	__tracing_path_set("tracing/", mnt);
 
-	return mnt;
+	return tracing_path;
 }
 
 const char *tracing_path_mount(void)

      parent reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-16 11:48 [PATCH] " Jiri Olsa
2018-10-16 15:18 ` Arnaldo Carvalho de Melo
2018-10-16 15:23   ` Arnaldo Carvalho de Melo
2018-10-18  6:19 ` tip-bot for Jiri Olsa [this message]

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