Re: [PATCH][RFC] Measuring term of acquiring spinlock

[Hitoshi Mitake]

From: Ingo Molnar <mingo@xxxxxxx>
Subject: Re: [PATCH][RFC] Measuring term of acquiring spinlock
Date: Thu, 12 Nov 2009 08:39:09 +0100

> 
> * Hitoshi Mitake <mitake@xxxxxxxxxxxxxxxxxxxxx> wrote:
> 
> > * Description
> > 
> > This patch makes the file spinlock_stats on top of the debugfs.
> > When user reads this file, some statistical data related to
> > spinlocks are printed.
> 
> hm, are you aware of the lockstat tracepoints? They do something like 
> this - and it utilizes perf events to report these events. See 
> include/trace/events/lockdep.h. Needs CONFIG_LOCK_STAT enabled.
>

Wow, I didn't know that. I'll try it.

> Might make sense to put it into 'perf lock' kind of tool. I think 
> Frederic had such plans.

If you want a tester for 'perf lock', please call me, Frederic :)
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