linux-ext4 - Re: [PATCH 1/9] mm: add generic adaptive large memory allocation APIs

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Message-ID: <AANLkTimAfd5vWURp75galRdoHxszFS7GYsOfGHZLD3h7@mail.gmail.com>
Date:	Fri, 14 May 2010 16:12:41 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	akpm@...ux-foundation.org, Hoang-Nam Nguyen <hnguyen@...ibm.com>,
	Christoph Raisch <raisch@...ibm.com>,
	Roland Dreier <rolandd@...co.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Divy Le Ray <divy@...lsio.com>,
	"James E.J. Bottomley" <James.Bottomley@...e.de>,
	"Theodore Ts'o" <tytso@....edu>, Andreas Dilger <adilger@....com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>, linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.linux-foundation.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Subject: Re: [PATCH 1/9] mm: add generic adaptive large memory allocation APIs

On Fri, May 14, 2010 at 4:03 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Thu, 2010-05-13 at 22:08 +0800, Changli Gao wrote:
>> > NAK, I really utterly dislike that inatomic argument. The alloc side
>> > doesn't function in atomic context either. Please keep the thing
>> > symmetric in that regards.
>> >
>>
>> There are some users, who release memory in atomic context. for
>> example: fs/file.c: fdmem.
>
> urgh, but yeah, aside from not using vmalloc to allocate fd tables one
> needs to deal with this.
>
> But if that is the only one, I'd let them do the workqueue thing that's
> already there. If there really are more people wanting to do this, then
> maybe add: kvfree_atomic().
>

Tetsuo has pointed another one in apparmor.
http://kernel.ubuntu.com/git?p=jj/ubuntu-lucid.git;a=blobdiff;f=security/apparmor/match.c;h=d2cd55419acfcae85cb748c8f837a4384a3a0d29;hp=afc2dd2260edffcf88521ae86458ad03aa8ea12c;hb=f5eba4b0a01cc671affa429ba1512b6de7caeb5b;hpb=abdff9ddaf2644d0f9962490f73e030806ba90d3
, though apparmor hasn't been merged into mainline.

-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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