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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: David Miller <davem@davemloft.net>,
	clameter@sgi.com, hugh@veritas.com, James.Bottomley@steeleye.com,
	rmk+lkml@arm.linux.org.uk, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Containment measures for slab objects on scatter gather lists
Date: Fri, 29 Jun 2007 13:16:57 +0100	[thread overview]
Message-ID: <20070629131657.5ecc3baa@the-village.bc.nu> (raw)
In-Reply-To: <20070628224519.1a3319c3.akpm@linux-foundation.org>

> If those operations involve modifying that slab page's pageframe then what
> stops concurrent dma'ers from stomping on each other's changes?  As in:
> why aren't we already buggy?

Or DMA operations falling out with CPU operations in the same memory
area. Not all platforms have hardware consistency and some will blat the
entire page out of cache.


  parent reply	other threads:[~2007-06-29 12:12 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-29  4:01 Christoph Lameter
2007-06-29  4:10 ` David Miller
2007-06-29  4:22   ` Christoph Lameter
2007-06-29  4:28     ` David Miller
2007-06-29  4:39       ` Christoph Lameter
2007-06-29  5:06         ` David Miller
2007-06-29  5:24           ` Andrew Morton
2007-06-29  5:37             ` David Miller
2007-06-29  5:45               ` Andrew Morton
2007-06-29  6:51                 ` Christoph Lameter
2007-06-29 12:16                 ` Alan Cox [this message]
2007-06-29 20:45                   ` Andrew Morton
2007-06-29 21:14                     ` Russell King
2007-06-29 23:11                       ` Alan Cox
2007-06-30  7:54                         ` Russell King
2007-06-29 22:39                     ` Alan Cox
2007-06-29  6:50               ` Christoph Lameter
2007-06-30  8:49             ` Christoph Hellwig
2007-06-29  7:00           ` Christoph Lameter
2007-06-29  9:06             ` David Miller
2007-06-29 13:04 ` Hugh Dickins
2007-06-29 14:15   ` Christoph Lameter

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