Subject: Re: 2.6.9-rc2-mm1 swsusp bug report.
From: Nigel Cunningham <ncunningham@linuxmail.org>
Reply-To: ncunningham@linuxmail.org
To: Pavel Machek <pavel@ucw.cz>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>, Kevin Fenzi <kevin@scrye.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
In-Reply-To: <20040925154527.GA8212@elf.ucw.cz>
References: <20040924021956.98FB5A315A@voldemort.scrye.com>
	 <20040924143714.GA826@openzaurus.ucw.cz>
	 <20040924210958.A3C5AA2073@voldemort.scrye.com>
	 <1096069216.3591.16.camel@desktop.cunninghams>
	 <20040925014546.200828E71E@voldemort.scrye.com>
	 <1096113235.5937.3.camel@desktop.cunninghams>
	 <415562FE.3080709@yahoo.com.au>  <20040925154527.GA8212@elf.ucw.cz>
Content-Type: text/plain
Message-Id: <1096149821.8359.1.camel@desktop.cunninghams>
Mime-Version: 1.0
Date: Sun, 26 Sep 2004 08:03:42 +1000
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1476
Lines: 39

Hi.

On Sun, 2004-09-26 at 01:45, Pavel Machek wrote:
> Hi!
> 
> > >>What causes memory to be so fragmented? 
> > >
> > >
> > >Normal usage; the pattern of pages being freed and allocated inevitably
> > >leads to fragmentation. The buddy allocator does a good job of
> > >minimising it, but what is really needed is a run-time defragmenter. I
> > >saw mention of this recently, but it's probably not that practical to
> > >implement IMHO.
> > 
> > Well, by this stage it looks like memory is already pretty well shrunk
> > as much as it is going to be, which means that even a pretty capable
> > defragmenter won't be able to do anything.
> 
> True, defragmenter would not help.
> 
> Anyway, conversion from order-8 allocation should be pretty easy, but
> I never seen that failure case and this is first report... So I'm not
> doing that work just yet. [There's big chunk of changes waiting in
> -mm, that needs to be merged because any other work should be done.]

Are we still planning on having suspend2 replace swsusp eventually? It
was a lot of work to switch from those high order allocations, and if we
are still going to replace swsusp, perhaps it's would be a better use of
your time to do other things?

Regards,

Nigel

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/