linux-kernel - Re: [PATCH] Containment measures for slab objects on scatter gather lists

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Message-ID: <20070630084948.GC21186@infradead.org>
Date:	Sat, 30 Jun 2007 09:49:48 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>, clameter@....com,
	hugh@...itas.com, James.Bottomley@...eleye.com,
	rmk+lkml@....linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Containment measures for slab objects on scatter gather lists

On Thu, Jun 28, 2007 at 10:24:24PM -0700, Andrew Morton wrote:
> > Really, it would be great if we could treat kmalloc() objects
> > just like real pages.
> 
> >From a high level, that seems like a bad idea.  kmalloc() gives you a
> virtual address and you really shouldn't be poking around at that memory's
> underlying page's pageframe metadata.
> 
> However we can of course do tasteless and weird things if the benefit is
> sufficient....

Hey, when we had exactly that issues coming up with xfs/ext3 recovery over
iscsi/aoe you said it's fine :)  End result is that XFS got fixed and ext3
is still broken..

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