From: Andrew Morton <akpm@osdl.org>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: davem@davemloft.net, anton@samba.org, linux-arch@vger.kernel.org,
Peter.Keilty@hp.com
Subject: Re: Global spinlock vs local bit spin locks
Date: Thu, 16 Jun 2005 21:45:18 -0700 [thread overview]
Message-ID: <20050616214518.7df96d8a.akpm@osdl.org> (raw)
In-Reply-To: <1118982092.5261.44.camel@npiggin-nld.site>
Nick Piggin <nickpiggin@yahoo.com.au> wrote:
>
> Peter Keilty is running into some scalability problems with buffer
> head based IO. There are a couple of global spinlocks in the buffer
> completion path, and they're showing up on 16-way IA64 systems.
Well in -mm these spinlocks are hashed and the performance is good. But
it's a bit dorky. So we don't _have_ to go with the bit_spin_lock()
approach. But bit_spin_lock() is nicer.
The reason why I went with a hashed lock is that I have memories of being
beaten up over suckiness of bit_spin_lock(). But I'm now wondering who was
beating me up, and why ;)
next prev parent reply other threads:[~2005-06-17 4:45 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-17 4:21 Global spinlock vs local bit spin locks Nick Piggin
2005-06-17 4:45 ` Andrew Morton [this message]
2005-06-17 8:50 ` Andi Kleen
2005-06-17 4:45 ` David S. Miller
2005-06-17 4:46 ` William Lee Irwin III
2005-06-17 4:52 ` Andrew Morton
2005-06-17 8:35 ` Nick Piggin
2005-06-17 8:45 ` William Lee Irwin III
2005-06-17 9:21 ` Nick Piggin
2005-06-17 9:28 ` William Lee Irwin III
2005-06-17 8:54 ` Andi Kleen
2005-06-17 9:15 ` William Lee Irwin III
2005-06-17 9:27 ` Nick Piggin
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