From: Mike Galbraith <efault@gmx.de>
To: sedat.dilek@gmail.com
Cc: Paul McKenney <paul.mckenney@linaro.org>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
x86@kernel.org, linux-next <linux-next@vger.kernel.org>
Subject: Re: [next-20120823] NOHZ: local_softirq_pending 200 on s/r
Date: Fri, 24 Aug 2012 09:26:08 +0200 [thread overview]
Message-ID: <1345793168.4331.64.camel@marge.simpson.net> (raw)
In-Reply-To: <CA+icZUW2aUP=vjBeoksFU=NAVFMJEiBQy6sNKZczzRPEP9kOfw@mail.gmail.com>
On Thu, 2012-08-23 at 12:04 +0200, Sedat Dilek wrote:
> Jack Winter confirmed to see similiar NOHZ messages also on
> v3.4.9-rt17 kernel (CPU: Core2Duo when no suspend performed):
>
> [15223.171585] NOHZ: local_softirq_pending 08
These can be caused by blocking while holding local_softirq_lock.
Even with per softirq threads, and then (yet more overhead) splitting
the lock to make sure one softirq type can't block another, _and_ only
griping if the lock for the pending softirq is _not_ held, seems the
little bugger can still be triggered very rarely by syn flood induced
handler bail/raise. Annoying little gripe :)
-Mike
next prev parent reply other threads:[~2012-08-24 7:26 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-23 10:04 [next-20120823] NOHZ: local_softirq_pending 200 on s/r Sedat Dilek
2012-08-23 10:46 ` Thomas Gleixner
2012-08-23 15:43 ` Paul E. McKenney
2012-08-23 16:06 ` Sedat Dilek
2012-08-23 17:14 ` Paul E. McKenney
2012-08-23 18:55 ` Sedat Dilek
2012-08-23 19:09 ` Paul E. McKenney
2012-08-24 7:26 ` Mike Galbraith [this message]
2012-08-24 14:52 ` Paul E. McKenney
2012-08-24 15:40 ` Thomas Gleixner
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