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Date: Tue, 11 Nov 2008 23:32:25 +0100
Message-ID: <s5hbpwlj3ly.wl%tiwai@suse.de>
From: Takashi Iwai <tiwai@suse.de>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
       Andreas Gruenbacher <agruen@suse.de>, Jan Blunck <jblunck@suse.de>,
       Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
       Mike Travis <travis@sgi.com>
Subject: Re: [PATCH] Allocate module.ref array dynamically
In-Reply-To: <491A0416.1040809@cosmosbay.com>
References: <s5htzaekp6o.wl%tiwai@suse.de>
	<491A01E2.2010701@cosmosbay.com>
	<491A0416.1040809@cosmosbay.com>
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At Tue, 11 Nov 2008 23:15:50 +0100,
Eric Dumazet wrote:
> 
> Eric Dumazet a écrit :
> > Takashi Iwai a écrit :
> >> Hi,
> >>
> >> we found that the kernel module sizes and memory footprints
> >> grow drastically when NR_CPUS is high.  For example, with
> >> NR_CPUS=4096, SUSE kernel packages weigh over 500MB (even w/o debug
> >> info).
> >>
> >> A part of the reason is the fixed size array in struct module.
> >> The patch below fixes the problem by allocating it dynamically.
> >> With the patch, the size can go down to 20MB.
> >>
> >>
> >> Any comments/suggestions appreciated.
> >>
> > 
> > Many attempts were done on this area on the past.
> 
> Forgot to include a link to previous attempt : http://lkml.org/lkml/2008/5/15/402

Thanks, an interesting thread.


Takashi