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From: Rick Jones <rick.jones2@hp.com>
To: Petr Tesarik <ptesarik@suse.cz>
Cc: linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org, tee@sgi.com
Subject: Re: [PATCH 0/2] enable irqs when waiting for rwlocks
Date: Wed, 22 Oct 2008 10:31:53 -0700	[thread overview]
Message-ID: <48FF6389.9050408@hp.com> (raw)
In-Reply-To: <1224664414.4430.33.camel@elijah.suse.cz>

Petr Tesarik wrote:
> Hello,
> 
> SGI has observed that on large systems, interrupts are not serviced for
> a long period of time when waiting for a rwlock. The following patch
> series re-enables irqs while waiting for the lock, resembling the code
> which is already there for spinlocks.

Perhaps I'm just out in left field, but that (and the similar behaviour 
for obtaining a spinlock?) feels like treating a symptom rather than a 
root cause where the root cause would appear to be long lock hold 
times/contention?

rick jones

  parent reply	other threads:[~2008-10-22 17:32 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-22  8:33 Petr Tesarik
2008-10-22  8:34 ` [PATCH 1/2] Allow rwlocks to re-enable interrupts Petr Tesarik
2008-10-22  8:45   ` Peter Zijlstra
2008-10-22  8:58     ` Petr Tesarik
2008-10-22 17:24       ` Peter Zijlstra
2008-10-22 19:05         ` Matthew Wilcox
2008-10-22 19:19           ` Peter Zijlstra
2008-10-22 17:31 ` Rick Jones [this message]
2008-10-23 14:12   ` [PATCH 0/2] enable irqs when waiting for rwlocks Robin Holt

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