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Message-ID: <20091113081722.GA14009@elte.hu> Date: Fri, 13 Nov 2009 09:17:22 +0100 From: Ingo Molnar <mingo@...e.hu> To: Hitoshi Mitake <mitake@....info.waseda.ac.jp> Cc: a.p.zijlstra@...llo.nl, tglx@...utronix.de, fweisbec@...il.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH][RFC] Measuring term of acquiring spinlock * Hitoshi Mitake <mitake@....info.waseda.ac.jp> wrote: > From: Ingo Molnar <mingo@...e.hu> > Subject: Re: [PATCH][RFC] Measuring term of acquiring spinlock > Date: Thu, 12 Nov 2009 08:39:09 +0100 > > > > > * Hitoshi Mitake <mitake@....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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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