Messages in this thread | | | Date | Fri, 13 Nov 2009 09:51:23 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH][RFC] Measuring term of acquiring spinlock |
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* Frederic Weisbecker <fweisbec@gmail.com> wrote:
> On Fri, Nov 13, 2009 at 09:17:22AM +0100, Ingo Molnar wrote: > > > > * Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> wrote: > > > > > From: Ingo Molnar <mingo@elte.hu> > > > Subject: Re: [PATCH][RFC] Measuring term of acquiring spinlock > > > Date: Thu, 12 Nov 2009 08:39:09 +0100 > > > > > > > > > > > * Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp> 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. > > > > Btw., i think we should rename that tracepoint category from 'lockdep' > > to 'lock'. It's possible to enable them without CONFIG_PROVE_LOCKING, > > and they arent high-overhead in that case. > > > > Ingo > > > I have a pending patch for that somewhere. I can send it right away.
Cool - thanks!
Ingo
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