From: Andi Kleen <ak@suse.de>
To: "Fernando Luis Vázquez Cao" <fernando@oss.ntt.co.jp>
Cc: Hugh Dickins <hugh@veritas.com>,
Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: PageLRU can be non-atomic bit operation
Date: Wed, 25 Apr 2007 10:59:24 +0200 [thread overview]
Message-ID: <200704251059.24994.ak@suse.de> (raw)
In-Reply-To: <1177491416.15618.7.camel@sebastian.intellilink.co.jp>
> This seems to imply that we need the lock prefix even when updating
> different bits within the same long (not just the same byte). Is this
> interpretation correct?
Yes, that is what I said. The consistency applies to loads/stores
(so e.g. for 128bit SSE2 load/stores too), not bytes.
The current IA32 manuals have a more detailed description of the rules
in volume 3
-Andi
prev parent reply other threads:[~2007-04-25 8:59 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-23 10:54 [PATCH] mm: PageLRU can be non-atomic bit operation Hisashi Hifumi
2007-04-23 11:16 ` Hugh Dickins
2007-04-23 12:34 ` Hisashi Hifumi
2007-04-23 13:42 ` Hugh Dickins
2007-04-24 1:54 ` Hisashi Hifumi
2007-04-24 2:29 ` KAMEZAWA Hiroyuki
2007-04-24 2:47 ` Nick Piggin
2007-04-24 8:12 ` Hisashi Hifumi
2007-04-24 10:13 ` Nick Piggin
2007-04-24 13:40 ` Hugh Dickins
2007-04-24 14:22 ` Andi Kleen
2007-04-25 8:56 ` Fernando Luis Vázquez Cao
2007-04-25 8:59 ` Andi Kleen [this message]
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