From: Joel Schopp <jschopp@austin.ibm.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Ingo Molnar <mingo@elte.hu>, lkml <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
Arjan van de Ven <arjan@infradead.org>,
Nicolas Pitre <nico@cam.org>,
Jes Sorensen <jes@trained-monkey.org>,
Al Viro <viro@ftp.linux.org.uk>, Oleg Nesterov <oleg@tv-sign.ru>,
David Howells <dhowells@redhat.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Christoph Hellwig <hch@infradead.org>, Andi Kleen <ak@suse.de>,
Russell King <rmk+lkml@arm.linux.org.uk>,
Anton Blanchard <anton@samba.org>,
PPC64-dev <linuxppc64-dev@ozlabs.org>
Subject: Re: [patch 00/21] mutex subsystem, -V14
Date: Thu, 05 Jan 2006 17:36:42 -0600 [thread overview]
Message-ID: <43BDAD8A.60108@austin.ibm.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0601051523060.3169@g5.osdl.org>
>>Here is a first pass at a powerpc file for the fast paths just as an FYI/RFC.
>>It is completely untested, but compiles.
>
>
> Shouldn't you make that "isync" dependent on SMP too? UP doesn't need it,
> since DMA will never matter, and interrupts are precise.
>
> Linus
>
I think the isync is necessary to keep heavily out of order processors from
getting ahead of themselves even on UP. Scanning back through the powerpc
spinlock code they seem to take the same view there as well.
next prev parent reply other threads:[~2006-01-05 23:37 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-04 14:41 [patch 00/21] mutex subsystem, -V14 Ingo Molnar
2006-01-04 23:45 ` Joel Schopp
2006-01-05 2:38 ` Nicolas Pitre
2006-01-05 2:51 ` Linus Torvalds
2006-01-05 3:21 ` Nick Piggin
2006-01-05 3:39 ` Anton Blanchard
2006-01-05 18:04 ` Jesse Barnes
2006-01-05 14:40 ` Ingo Molnar
2006-01-05 16:21 ` Linus Torvalds
2006-01-05 22:03 ` Ingo Molnar
2006-01-05 22:17 ` Linus Torvalds
2006-01-05 22:43 ` Ingo Molnar
2006-01-06 3:49 ` Keith Owens
2006-01-06 7:34 ` Denis Vlasenko
2006-01-05 14:35 ` Ingo Molnar
2006-01-05 16:42 ` Joel Schopp
2006-01-05 22:21 ` Ingo Molnar
2006-01-05 23:06 ` Joel Schopp
2006-01-05 23:26 ` Linus Torvalds
2006-01-05 23:36 ` Joel Schopp [this message]
2006-01-05 23:42 ` Ingo Molnar
2006-01-06 0:29 ` Olof Johansson
2006-01-07 17:49 ` PowerPC fastpaths for mutex subsystem Joel Schopp
2006-01-07 22:37 ` Andrew Morton
2006-01-08 7:43 ` Anton Blanchard
2006-01-08 8:00 ` Andrew Morton
2006-01-08 8:23 ` Anton Blanchard
2006-01-09 11:13 ` David Howells
2006-01-08 9:48 ` Ingo Molnar
2006-01-10 22:31 ` Joel Schopp
2006-01-10 23:09 ` Ingo Molnar
2006-01-11 10:52 ` Ingo Molnar
2006-01-11 17:44 ` Joel Schopp
2006-01-08 10:43 ` Ingo Molnar
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