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From: Petr Tesarik <>
Subject: [PATCH 0/2] enable irqs when waiting for rwlocks
Date: Wed, 22 Oct 2008 10:33:34 +0200	[thread overview]
Message-ID: <> (raw)


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.

I only made the ia64 version, because the patch adds some overhead to
the fast path. In particular, I wasn't able to make a reasonably
lightweight implementation for x86, so I assume there are not such large
systems based on x86(_64). Of course, the possibility to implement
raw_{read|write}_lock_flags for any architecture is still there.

Petr Tesarik

             reply	other threads:[~2008-10-22  8:33 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-22  8:33 Petr Tesarik [this message]
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 ` [PATCH 0/2] enable irqs when waiting for rwlocks Rick Jones
2008-10-23 14:12   ` Robin Holt

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