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Date: Thu, 7 Mar 2002 07:04:42 -0700
From: yodaiken@fsmlabs.com
To: Daniel Phillips <phillips@bonn-fries.net>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, Jeff Dike <jdike@karaya.com>,
        Benjamin LaHaise <bcrl@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [RFC] Arch option to touch newly allocated pages
Message-ID: <20020307070442.A26987@hq.fsmlabs.com>
In-Reply-To: <E16iyGp-0002IL-00@the-village.bc.nu> <E16iy41-00037z-00@starship.berlin>
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In-Reply-To: <E16iy41-00037z-00@starship.berlin>; from phillips@bonn-fries.net on Thu, Mar 07, 2002 at 02:36:08PM +0100
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On Thu, Mar 07, 2002 at 02:36:08PM +0100, Daniel Phillips wrote:
> On March 7, 2002 02:49 pm, Alan Cox wrote:
> > Jeff Dike Apparently wrote
> > > caller.  This is actually wrong because in this failure case, it effectively
> > > changes the semantics of GFP_USER, GFP_KERNEL, and the other blocking GFP_* 
> > > allocations to GFP_ATOMIC.  And that's what forced UML to segfault the 
> > > compilations.
> > 
> > GFP_KERNEL will sometimes return NULL.
> 
> Sad but true.  IMHO we are on track to fix that in this kernel cycle, with
> better locked/dirty accounting and rmap to forcibly unmap pages when necessary.

Why is that a fix? And how can it work?


-- 
---------------------------------------------------------
Victor Yodaiken 
Finite State Machine Labs: The RTLinux Company.
 www.fsmlabs.com  www.rtlinux.com

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