linux-kernel - Re: iwl3945: order 5 allocation during ifconfig up; vm problem?

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Message-Id: <20120911162536.bd5171a1.akpm@linux-foundation.org>
Date:	Tue, 11 Sep 2012 16:25:36 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pavel Machek <pavel@....cz>
Cc:	David Rientjes <rientjes@...gle.com>, sgruszka@...hat.com,
	linux-wireless@...r.kernel.org, johannes.berg@...el.com,
	wey-yi.w.guy@...el.com, ilw@...ux.intel.com,
	Andrew Morton <akpm@...l.org>, Mel Gorman <mgorman@...e.de>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: iwl3945: order 5 allocation during ifconfig up; vm problem?

On Mon, 10 Sep 2012 13:11:13 +0200
Pavel Machek <pavel@....cz> wrote:

> On Sun 2012-09-09 15:40:55, David Rientjes wrote:
> > On Sun, 9 Sep 2012, Pavel Machek wrote:
> > 
> > > On 3.6.0-rc2+, I tried to turn on the wireless, but got
> > > 
> > > root@amd:~# ifconfig wlan0 10.0.0.6 up
> > > SIOCSIFFLAGS: Cannot allocate memory
> > > SIOCSIFFLAGS: Cannot allocate memory
> > > root@amd:~# 
> > > 
> > > It looks like it uses "a bit too big" allocations to allocate
> > > firmware...? Order five allocation....
> > > 
> > > Hmm... then I did "echo 3  > /proc/sys/vm/drop_caches" and now the
> > > network works. Is it VM problem that it failed to allocate memory when
> > > it was freeable?
> > > 
> > 
> > Do you have CONFIG_COMPACTION enabled?
> 
> Yes:
> 
> pavel@amd:/data/l/linux-good$ zgrep CONFIG_COMPACTION /proc/config.gz 
> CONFIG_COMPACTION=y

Asking for a 256k allocation is pretty crazy - this is an operating
system kernel, not a userspace application.

I'm wondering if this is due to a recent change, but I'm having trouble
working out where the allocation call site is.
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