linux-kernel - Re: [uml-devel] why does index in truncate_inode_pages

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Message-ID: <CAFLxGvy16wv0m4D+ydmqbksUu9CaEaDtGdtnk1YHa56jAU+SEA@mail.gmail.com>
Date:	Fri, 13 Dec 2013 11:51:02 +0100
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	Jan Kara <jack@...e.cz>, "linux-mm@...ck.org" <linux-mm@...ck.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	UML devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: Re: [uml-devel] why does index in truncate_inode_pages_range() grows
 so much ?

On Fri, Dec 13, 2013 at 10:52 AM, Toralf Förster <toralf.foerster@....de> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> On 12/11/2013 09:26 PM, Jan Kara wrote:
>> Thanks! So this works more or less as expected - trinity issued a
>> read at absurdly high offset so we created pagecache page a that
>> offset and tried to read data into it. That failed. We left the
>> page in the pagecache where it was for reclaim to reclaim it when
>> free pages are needed. Everything works as designed except we could
>> possibly argue that it's not the most efficient way to use
>> pages...
>>
>> Patch 'vfs: fix a bug when we do some dio reads with append dio
>> writes' (http://www.spinics.net/lists/linux-fsdevel/msg70899.html)
>> should actually change the situation and we won't unnecessarily
>> cache these pages.
>>
> confirmed - applied to latest git tree of Linus I helps.

Good to know! :-)

-- 
Thanks,
//richard
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