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

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Message-ID: <alpine.DEB.2.00.0907211242570.11743@gandalf.stny.rr.com>
Date:	Tue, 21 Jul 2009 12:44:15 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ray Lee <ray-lk@...rabbit.org>
cc:	Jason Baron <jbaron@...hat.com>, mingo@...e.hu,
	linux-kernel@...r.kernel.org, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, fweisbec@...il.com
Subject: Re: [PATCH 2/2] perf_counter: detect debugfs location


On Tue, 21 Jul 2009, Ray Lee wrote:

> 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.

Well, those that have thousand of mounts could probably get away with 
setting PERF_DIR_DEBUGFS in /etc/profile.

But, a simple stat("/sys/kernel/debug/tracing") should be easy enough.

-- Steve

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