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

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Message-ID: <20120912092211.GA3146@redhat.com>
Date:	Wed, 12 Sep 2012 11:22:12 +0200
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Pavel Machek <pavel@....cz>, David Rientjes <rientjes@...gle.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 Tue, Sep 11, 2012 at 04:25:36PM -0700, Andrew Morton wrote:
> 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.

iwlwifi/iwlegacy do such kind of allocation for ages, since iwlwifi driver
inclusion in 2.6.24 (however firmware was smaller then).

I can fix that in iwlegacy similar as Johannes did it in iwlwifi, but this
actually seems to be allocator regression. We use GFP_KERNEL allocation,
kernel can wait for free memory and/or swap out pages, I do not understand
why this fail.

Stanislaw
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