Re: [PATCH 2/2] perf_counter: detect debugfs location

[Steven Rostedt]

On Tue, 21 Jul 2009, Ray Lee wrote:

> On Tue, Jul 21, 2009 at 9:20 AM, Jason Baron <jbaron@xxxxxxxxxx> 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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