linux-kernel - Re: [PATCH 2/7] mmc: Don't use PF

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Message-ID: <28c262360911170232i307144cnb4ddea2a5389bd8e@mail.gmail.com>
Date:	Tue, 17 Nov 2009 19:32:36 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mmc@...r.kernel.org
Subject: Re: [PATCH 2/7] mmc: Don't use PF_MEMALLOC

On Tue, Nov 17, 2009 at 7:29 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> On Tue, 17 Nov 2009 16:17:50 +0900 (JST)
> KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
>
>> Non MM subsystem must not use PF_MEMALLOC. Memory reclaim need few
>> memory, anyone must not prevent it. Otherwise the system cause
>> mysterious hang-up and/or OOM Killer invokation.
>
> So now what happens if we are paging and all our memory is tied up for
> writeback to a device or CIFS etc which can no longer allocate the memory
> to complete the write out so the MM can reclaim ?
>
> Am I missing something or is this patch set not addressing the case where
> the writeback thread needs to inherit PF_MEMALLOC somehow (at least for
> the I/O in question and those blocking it)
>

I agree.
At least, drivers for writeout is proper for using PF_MEMALLOC, I think.


> Alan
>
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-- 
Kind regards,
Minchan Kim
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