From: Claudio Martins <ctpm@ist.utl.pt>
To: Neil Brown <neilb@cse.unsw.edu.au>
Subject: Re: Processes stuck on D state on Dual Opteron
Date: Tue, 12 Apr 2005 01:30:29 +0100
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Cc: Nick Piggin <nickpiggin@yahoo.com.au>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org
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On Tuesday 12 April 2005 00:46, Neil Brown wrote:
> On Monday April 11, nickpiggin@yahoo.com.au wrote:
> > Neil, have you had a look at the traces? Do they mean much to you?
>
> Just looked.
> bio_alloc_bioset seems implicated, as does sync_page_io.
>
> sync_page_io used to use a 'struct bio' on the stack, but Jens Axboe
> change it to use bio_alloc (don't know why..) and I should have
> checked the change better.
>
> sync_page_io can be called on the write out path, so it should use
> GFP_NOIO rather than GFP_KERNEL.
>
> See if this helps.... Actually this patch is against 2.6.12-rc2-mm1
> which uses md_super_write instead of sync_page_io (which is now only
> used for read).  So if you are using a non-mm kernel (which seems to
> be the case) you'll need to apply the patch by hand.
>

   Hi Neil,

  I'll test this patch, but I'm wondering if I have to apply all the 
md-related patches from broken out directory of 2.6.12-rc2-mm1 or only some 
specific ones?
   Anyway I'm happy to test all those md updates, if you think they might 
help.

 Thanks 

Claudio

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