linux-kernel - Re: [PATCH 2/2] perf_counter: detect debugfs location

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Message-ID: <2c0942db0907210926ra96ee33ke3e6ac8c57458be8@mail.gmail.com>
Date:	Tue, 21 Jul 2009 09:26:54 -0700
From:	Ray Lee <ray-lk@...rabbit.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, rostedt@...dmis.org, fweisbec@...il.com
Subject: Re: [PATCH 2/2] perf_counter: detect debugfs location

On Tue, Jul 21, 2009 at 9:20 AM, Jason Baron <jbaron@...hat.com> wrote:
>
> Search for the debugfs filesystem in /proc/mounts, but also allows the user to
> specify '--debugfs-dir=blah' or set the environment variable: 'PERF_DIR_DEBUGFS'

> -static char default_debugfs_path[] = "/sys/kernel/debug/tracing/events";

There are server systems out there that run with thousands of mounts.
It would be kinder to the users of those systems (ie, faster perf
startup) if you only went rooting around /proc/mounts if opening the
default location failed.
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