linux-kernel - Re: [PATCH v4 6/6] x86: allocate space within a region top-down

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Message-Id: <201010251515.30491.bjorn.helgaas@hp.com>
Date:	Mon, 25 Oct 2010 15:15:29 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Bob Picco <bpicco@...hat.com>,
	Brian Bloniarz <phunge0@...mail.com>,
	Charles Butterfield <charles.butterfield@...tcentury.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	linux-pci@...r.kernel.org,
	"Horst H. von Brand" <vonbrand@....utfsm.cl>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Stefan Becker <chemobejk@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai@...nel.org>,
	Leann Ogasawara <leann.ogasawara@...onical.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Chuck Ebbert <cebbert@...hat.com>
Subject: Re: [PATCH v4 6/6] x86: allocate space within a region top-down

On Monday, October 25, 2010 03:08:48 pm Bjorn Helgaas wrote:
> On Monday, October 25, 2010 03:01:54 pm Jesse Barnes wrote:
> > On Thu, 14 Oct 2010 17:18:52 -0600
> > Bjorn Helgaas <bjorn.helgaas@...com> wrote:
> > 
> > > 
> > > Request that allocate_resource() use available space from high addresses
> > > first, rather than the default of using low addresses first.
> > > 
> > > The most common place this makes a difference is when we move or assign
> > > new PCI device resources.  Low addresses are generally scarce, so it's
> > > better to use high addresses when possible.  This follows Windows practice
> > > for PCI allocation.
> > 
> > Applied this series to linux-next; assuming nothing blows up I'll send
> > it to Linus this week (previous versions got some testing and landed in
> > a separate branch so this should be fine).
> 
> We tripped over another issue in Fedora:
>   https://bugzilla.redhat.com/show_bug.cgi?id=646027

By the way, it's been a *great* help to have Fedora being willing to
go out on a limb and help get these tested.  I know it sucks to get
those Rawhide bug reports, but they have been extremely useful to me.
Thanks!

Bjorn
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