linux-kernel - Re: [PATCH 5 of 5] xen: Avoid allocations causing swap activity on the resume path

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Message-Id: <20080531164712.2788baf2.akpm@linux-foundation.org>
Date:	Sat, 31 May 2008 16:47:12 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ian Campbell <Ian.Campbell@...citrix.com>
Subject: Re: [PATCH 5 of 5] xen: Avoid allocations causing swap activity on
 the resume path

On Sat, 31 May 2008 11:10:18 +0100 Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> > Whether you should also add __GFP_HIGH to cause the page allocation to
> > bite harder into the page reserves is unclear to me, sorry.
> >   
> 
> Well, if the allocation fails the machine is dead in the water, because 
> it probably can't go on without its devices.  I think it's worth eating 
> to the reserves to avoid that.  (I'll have a close look to only add it 
> to allocations which are really unrecoverable if they fail.)

OK.

I don't actually have a clue what you're doing here.  Restoring a
virtual machine from disk/network or something like that?

It might be appropriate to do a big memory-reclaim before starting the
operation, along the lines of suspend-to-disk - go off and allocate
(and possible pin) sufficient memroy for the entire operation before
actually starting it?

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