From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH] lockdep: Make lockstats counting per cpu
Date: Fri, 26 Mar 2010 18:39:13 +0100 [thread overview]
Message-ID: <20100326173911.GE5188@nowhere> (raw)
In-Reply-To: <1269586358.12097.117.camel@laptop>
On Fri, Mar 26, 2010 at 07:52:38AM +0100, Peter Zijlstra wrote:
> On Fri, 2010-03-26 at 03:22 +0100, Frederic Weisbecker wrote:
> > We can't use irqsafe per cpu counters for that as
> > these stats might be also written from NMI path, and irqsafe per
> > cpu counters are not NMI safe, but local_t operations are.
> >
> lockdep shouldn't do NMI, nmi_enter() has an explicit lockdep_off().
>
Ah ok, thanks.
next prev parent reply other threads:[~2010-03-26 17:39 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-26 2:22 [PATCH] lockdep: Make lockstats counting per cpu Frederic Weisbecker
2010-03-26 3:11 ` Frederic Weisbecker
2010-03-26 3:13 ` Frederic Weisbecker
2010-03-26 9:16 ` Ingo Molnar
2010-03-26 17:11 ` Frederic Weisbecker
2010-03-26 6:52 ` Peter Zijlstra
2010-03-26 7:48 ` Peter Zijlstra
2010-03-26 17:43 ` Frederic Weisbecker
2010-03-26 17:39 ` Frederic Weisbecker [this message]
-- strict thread matches above, loose matches on Subject: below --
2010-03-28 0:29 [PATCH v3] " Frederic Weisbecker
2010-04-05 22:10 ` [PATCH] " Frederic Weisbecker
2010-04-06 8:46 ` Peter Zijlstra
2010-04-06 9:24 ` Frederic Weisbecker
2010-04-06 9:25 ` Frederic Weisbecker
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