linux-kernel - Re: [PATCH 6/6 v2] perf: Make perf aware of tracefs

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Date:	Sun, 8 Feb 2015 23:12:46 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [PATCH 6/6 v2] perf: Make perf aware of tracefs

Hi Steve,

On Mon, Feb 02, 2015 at 02:35:07PM -0500, Steven Rostedt wrote:
> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> 
> As tracefs may be mounted instead of debugfs to get to the event directories,
> have perf know about tracefs, and use that file system over debugfs if it
> is present.
> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>  tools/perf/tests/open-syscall-all-cpus.c |  7 +++-
>  tools/perf/tests/open-syscall.c          |  7 +++-
>  tools/perf/tests/parse-events.c          | 13 +++++--
>  tools/perf/util/cache.h                  |  1 +
>  tools/perf/util/evlist.c                 |  1 -
>  tools/perf/util/parse-events.h           |  2 +-
>  tools/perf/util/probe-event.c            | 24 ++++++++-----
>  tools/perf/util/util.c                   | 60 ++++++++++++++++++++++++++------
>  tools/perf/util/util.h                   |  1 +
>  9 files changed, 91 insertions(+), 25 deletions(-)
> 
> diff --git a/tools/perf/tests/open-syscall-all-cpus.c b/tools/perf/tests/open-syscall-all-cpus.c
> index 8fa82d1700c7..21969e99ea46 100644
> --- a/tools/perf/tests/open-syscall-all-cpus.c
> +++ b/tools/perf/tests/open-syscall-all-cpus.c
> @@ -29,7 +29,12 @@ int test__open_syscall_event_on_all_cpus(void)
>  
>  	evsel = perf_evsel__newtp("syscalls", "sys_enter_open");
>  	if (evsel == NULL) {
> -		pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
> +		if (tracefs_configured())
> +			pr_debug("is tracefs mounted on /sys/kernel/debug?\n");

Shouldn't it be /sys/kernel/tracing/ ?


> +		else if (debugfs_configured())
> +			pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
> +		else
> +			pr_debug("Neither tracefs or debugfs is enabled in this kernel\n");
>  		goto out_thread_map_delete;
>  	}
>  
> diff --git a/tools/perf/tests/open-syscall.c b/tools/perf/tests/open-syscall.c
> index a33b2daae40f..4250e40234d2 100644
> --- a/tools/perf/tests/open-syscall.c
> +++ b/tools/perf/tests/open-syscall.c
> @@ -18,7 +18,12 @@ int test__open_syscall_event(void)
>  
>  	evsel = perf_evsel__newtp("syscalls", "sys_enter_open");
>  	if (evsel == NULL) {
> -		pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
> +		if (tracefs_configured())
> +			pr_debug("is tracefs mounted on /sys/kernel/debug?\n");

Ditto.

Thanks,
Namhyung


> +		else if (debugfs_configured())
> +			pr_debug("is debugfs mounted on /sys/kernel/debug?\n");
> +		else
> +			pr_debug("Neither tracefs or debugfs is enabled in this kernel\n");
>  		goto out_thread_map_delete;
>  	}
--
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