linux-kernel - Re: [PATCH v2 2/3] mm: Update file times when inodes are written after mmaped writes

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Message-ID: <20121224083637.GA11906@gmail.com>
Date:	Mon, 24 Dec 2012 16:36:37 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v2 2/3] mm: Update file times when inodes are written
 after mmaped writes

On Fri, Dec 21, 2012 at 01:28:27PM -0800, Andy Lutomirski wrote:
> The onus is currently on filesystems to call file_update_time
> somewhere in the page_mkwrite path.  This is unfortunate for three
> reasons:
> 
> 1. page_mkwrite on a locked page should be fast.  ext4, for example,
>    often sleeps while dirtying inodes.  (This could be considered a
>    fixable problem with ext4, but this approach makes it
>    irrelevant.)

Hi Andy,

Out of curiosity, could you please share more detailed information about
how to reproduce and measure this problem in ext4?

Thanks
                                        - Zheng
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