linux-kernel - Re: [PATCH v2] fs: use kmalloc() to allocate fdmem if possible

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Message-ID: <4BE11BD0.8040703@suse.cz>
Date:	Wed, 05 May 2010 09:18:40 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Changli Gao <xiaosuo@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Avi Kivity <avi@...hat.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	eric.dumazet@...il.com
Subject: Re: [PATCH v2] fs: use kmalloc() to allocate fdmem if possible

On 05/05/2010 12:27 AM, Andrew Morton wrote:
> On Mon,  3 May 2010 03:02:00 +0800
> Changli Gao <xiaosuo@...il.com> wrote:
> 
>> use kmalloc() to allocate fdmem if possible.
>>
>> vmalloc() is used as a fallback solution for fdmem allocation. A new helper
>> function __free_fdtable() is introduced to reduce the lines of code.
>>
>> A potential bug, vfree() a memory allocated by kmalloc(), is fixed.
>>
> 
> Seems a reasonable thing to do.

Hi,

So didn't we converge to something like this:
http://lkml.org/lkml/2010/5/3/53
instead of this patch?

This

>  It might also be reasonable to make
> vmalloc() try kmalloc() first, but that's a separate exercise.

and this

> This most definitely should have __GFP_NOWARN.

is discussed there too btw.

thanks,
-- 
js
suse labs
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