From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: Vladislav Bolkhovitin <vst@vlnb.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86 bitops.h commentary on instruction reordering
Date: Fri, 6 Aug 2004 12:53:28 -0300 [thread overview]
Message-ID: <20040806155328.GA21546@logos.cnet> (raw)
In-Reply-To: <4113A579.5060702@vlnb.net>
On Fri, Aug 06, 2004 at 07:36:25PM +0400, Vladislav Bolkhovitin wrote:
> Thanks.
>
> One more question, if you don't object. How after some variable
> assigment to make other CPUs *immediatelly* see the assigned value, i.e.
> to make current CPU immediately flush its write cache in memory? *mb()
> seems deal with reordering, barrier() with the compiler optimization (am
> I right?).
Yes correct. *mb() usually imply barrier().
About the flush, each architecture defines its own instruction for doing so,
PowerPC has "sync" and "isync" instructions (to flush the whole cache and instruction
cache respectively), MIPS has "sync" and so on..
> The similar memory barrier spin_lock() does, but it's not
> easy to uderstand its internal magic.
next prev parent reply other threads:[~2004-08-06 16:42 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-05 20:06 [PATCH] x86 bitops.h commentary on instruction reordering Marcelo Tosatti
2004-08-06 14:17 ` Vladislav Bolkhovitin
2004-08-06 14:33 ` Marcelo Tosatti
2004-08-06 15:36 ` Vladislav Bolkhovitin
2004-08-06 15:53 ` Marcelo Tosatti [this message]
2004-08-06 16:52 ` Vladislav Bolkhovitin
2004-08-06 17:09 ` Marcelo Tosatti
2004-08-06 22:33 ` H. Peter Anvin
2004-08-07 1:01 ` Zwane Mwaikambo
2004-08-07 22:16 ` Alan Cox
2004-08-09 15:14 ` Vladislav Bolkhovitin
2004-08-09 15:50 ` Marcelo Tosatti
2004-08-09 17:35 ` Vladislav Bolkhovitin
[not found] ` <20040809183437.GD6361@logos.cnet>
2004-08-09 20:12 ` Vladislav Bolkhovitin
2004-08-09 21:21 ` Alan Cox
2004-08-10 12:28 ` Vladislav Bolkhovitin
2004-08-09 11:58 ` Maciej W. Rozycki
[not found] <2pY7Y-W1-7@gated-at.bofh.it>
[not found] ` <2qdJL-3sh-27@gated-at.bofh.it>
[not found] ` <2qePx-4eM-21@gated-at.bofh.it>
[not found] ` <2qf8S-4pI-31@gated-at.bofh.it>
[not found] ` <2qg4V-54c-17@gated-at.bofh.it>
[not found] ` <2qgoh-5og-29@gated-at.bofh.it>
[not found] ` <2qhkn-649-41@gated-at.bofh.it>
[not found] ` <2rkgh-zP-45@gated-at.bofh.it>
[not found] ` <2rlFk-1wC-27@gated-at.bofh.it>
[not found] ` <2rmhX-20I-17@gated-at.bofh.it>
[not found] ` <2roWw-40d-19@gated-at.bofh.it>
[not found] ` <2roWw-40d-17@gated-at.bofh.it>
2004-08-09 21:23 ` Andi Kleen
2004-08-10 12:26 ` Vladislav Bolkhovitin
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