linux-kernel - Re: [PATCH][RFC] Measuring term of acquiring spinlock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20091113085123.GA1318@elte.hu>
Date:	Fri, 13 Nov 2009 09:51:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RFC] Measuring term of acquiring spinlock


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> On Fri, Nov 13, 2009 at 09:17:22AM +0100, Ingo Molnar wrote:
> > 
> > * 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
> 
> 
> I have a pending patch for that somewhere. I can send it right away.

Cool - thanks!

	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/