linux-kernel - Re: [PATCH -v7 0/2] Fixing the issue with memory-mapped file times

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Date:	Tue, 22 Jan 2008 02:34:29 +0100
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Anton Salikhmetov" <salikhmetov@...il.com>
Cc:	linux-mm@...ck.org, jakob@...hought.net,
	linux-kernel@...r.kernel.org, valdis.kletnieks@...edu,
	riel@...hat.com, ksm@...dk, staubach@...hat.com,
	torvalds@...ux-foundation.org, a.p.zijlstra@...llo.nl,
	akpm@...ux-foundation.org, protasnb@...il.com, miklos@...redi.hu,
	r.e.wolff@...wizard.nl, hidave.darkstar@...il.com,
	hch@...radead.org
Subject: Re: [PATCH -v7 0/2] Fixing the issue with memory-mapped file times

On 22/01/2008, Anton Salikhmetov <salikhmetov@...il.com> wrote:
> This is the seventh version of my solution for the bug #2645:
>
> http://bugzilla.kernel.org/show_bug.cgi?id=2645
>
> Since the previous version, the following has changed: based on
> Linus' comment, SMP-safe PTE update implemented.
>
> Discussions, which followed my past submissions, showed that it was
> tempting to approach this problem using very different assumptions.
> However, many such designs have proved to be incomplete or inefficient.
>
> Taking into account the obvious complexity of this problem, I prepared a
> design document, the purpose of which is twofold. First, it summarizes
> previous attempts to resolve the ctime/mtime issue. Second, it attempts
> to prove that what the patches do is necessary and sufficient for mtime
> and ctime update provided that we start from a certain sane set of
> requirements. The design document is available via the following link:
>
> http://bugzilla.kernel.org/show_bug.cgi?id=2645#c40
>
> For the seventh version, comprehensive performance testing was performed.
> The results of performance tests, including numbers, are available here:
>
> http://bugzilla.kernel.org/show_bug.cgi?id=2645#c43
>

Hi Anton,

I applied your patches here and as far as my own test programs go,
these patches solve the previously observed problems I saw with mtime
not getting updated.

Thank you very much for so persistently working on these long standing issues.

-- 
Jesper Juhl <jesper.juhl@...il.com>
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