From: Matthew Wilcox <willy@debian.org>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH] don't use ld.bias
Date: Wed, 23 Jul 2003 12:00:15 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105896175111168@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105883179830025@msgid-missing>
On Tue, Jul 22, 2003 at 09:40:02PM -0700, Mallick, Asit K wrote:
> It does make sense to not use the ld.bias in the spinlock, it will make
> more cacheline bouncing in a larger SMP system.
it certainly makes a mockery of the comment:
* Streamlined test_and_set_bit(0, (x)). We use test-and-test-and-set
* rather than a simple xchg to avoid writing the cache-line when
* there is contention.
since there's no real advantage (AIUI) to have the cacheline
clean-exclusive vs dirty-exclusive.
but why not delete this code? it's under #else /* !NEW_LOCK */ and
NEW_LOCK looks to be the better code as well as the default in 2.5.
--
"It's not Hollywood. War is real, war is primarily not about defeat or
victory, it is about death. I've seen thousands and thousands of dead bodies.
Do you think I want to have an academic debate on this subject?" -- Robert Fisk
next prev parent reply other threads:[~2003-07-23 12:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-21 23:55 [PATCH] don't use ld.bias Jesse Barnes
2003-07-22 0:15 ` Chen, Kenneth W
2003-07-22 13:11 ` Jesse Barnes
2003-07-23 4:40 ` Mallick, Asit K
2003-07-23 12:00 ` Matthew Wilcox [this message]
2003-07-25 1:10 ` David Mosberger
2003-07-25 13:40 ` Jesse Barnes
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