linux-kernel - Re: [PATCH] trim memory not covered by WB MTRRs

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Message-ID: <20070607085147.GC15226@one.firstfloor.org>
Date:	Thu, 7 Jun 2007 10:51:47 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Jesse Barnes <jesse.barnes@...el.com>
Cc:	Justin Piszcz <jpiszcz@...idpixels.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] trim memory not covered by WB MTRRs

On Wed, Jun 06, 2007 at 04:27:46PM -0700, Jesse Barnes wrote:
> On Wednesday, June 6, 2007 4:24 pm Justin Piszcz wrote:
> > > The mem= approach though looks slightly off, but I haven't looked
> > > at x86_64's mem= handling to see why.  From a high level though,
> > > adjusting end_pfn is the right thing to do, since theoretically
> > > mem= could choose to make holes in your low memory and keep your
> > > high memory in the allocation pools (though it's not generally
> > > implemented this way).
> > >
> > > Jesse
> >
> > Ahh, ok!  Sounds great, I will keep running the kernel with your
> > patch without mem= and let you know if I see any issues.
> >
> > Chances of getting this into 2.6.22-rc5?
> 
> I'm not sure it's appropriate for -rc5 since it mucks around with some 
> early boot ordering, but I'll leave that to Andi, since it does address 
> some real bugs people have been seeing.

I don't think the patch is suitable for merging at this time. Perhaps
if it survives some time in -mm* / 2.6.23* it could be backported
in a later 2.6.22 stable release. But right now it definitely
needs more testing and addressing of my review comments.

> Can we add your "Tested-by:  Justin Piszcz <jpiszcz@...idpixels.com>" to 
> the patch? :)

All such headers are only for the trail of blame and do you want to blame
Justin if anything goes wrong? Perhaps it should rather have a 
Blame-to: <whoever wrote Justin/Jesse's BIOS> but that also wouldn't 
help without concrete contact points.

-ANdi
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