linux-kernel - Re: [PATCH 2/2] updating ctime and mtime at syncing

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Message-ID: <4df4ef0c0801150246r56675627nf669812ec9daff89@mail.gmail.com>
Date:	Tue, 15 Jan 2008 13:46:34 +0300
From:	"Anton Salikhmetov" <salikhmetov@...il.com>
To:	"Miklos Szeredi" <miklos@...redi.hu>
Cc:	a.p.zijlstra@...llo.nl, linux-mm@...ck.org, jakob@...hought.net,
	linux-kernel@...r.kernel.org, valdis.kletnieks@...edu,
	riel@...hat.com, ksm@...dk, staubach@...hat.com,
	jesper.juhl@...il.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, protasnb@...il.com
Subject: Re: [PATCH 2/2] updating ctime and mtime at syncing

2008/1/15, Miklos Szeredi <miklos@...redi.hu>:
> > Thanks for your review, Peter and Miklos!
> >
> > I overlooked this case when AS_MCTIME flag has been turned off and the
> > page is still dirty.
> >
> > On the other hand, the words "shall be marked for update" may be
> > considered as just setting the AS_MCTIME flag, not updating the time
> > stamps.
> >
> > What do you think about calling mapping_update_time() inside of "if
> > (MS_SYNC & flags)"? I suggest such change because the code for
> > analysis of the case you've mentioned above seems impossible to me.
>
> I think that's a good idea.  As a first iteration, just updating the
> mtime/ctime in msync(MS_SYNC) and remove_vma() (called at munmap time)
> would be a big improvement over what we currently have.
>
> I would also recommend, that you drop mapping_update_time() and the
> related functions from the patch, and just use file_update_time()
> instead.

Thank you for your recommendations. I will submit my new solution shortly.

By the way, I've already changed the unlink_file_vma() function.

>
> Miklos
>
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