linux-kernel - Re: why does index in truncate_inode_pages

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Message-ID: <52AAD8D4.2060807@gmx.de>
Date:	Fri, 13 Dec 2013 10:52:20 +0100
From:	Toralf Förster <toralf.foerster@....de>
To:	Jan Kara <jack@...e.cz>
CC:	UML devel <user-mode-linux-devel@...ts.sourceforge.net>,
	Linux Kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: why does index in truncate_inode_pages_range() grows so much
 ?

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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.

- -- 
MfG/Sincerely
Toralf Förster
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