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From: Miklos Szeredi <miklos@szeredi.hu>
To: salikhmetov@gmail.com
Cc: linux-mm@kvack.org, jakob@unthought.net,
	linux-kernel@vger.kernel.org, valdis.kletnieks@vt.edu,
	riel@redhat.com, ksm@42.dk, staubach@redhat.com,
	jesper.juhl@gmail.com, torvalds@linux-foundation.org,
	a.p.zijlstra@chello.nl, akpm@linux-foundation.org,
	protasnb@gmail.com, miklos@szeredi.hu, r.e.wolff@bitwizard.nl,
	hidave.darkstar@gmail.com, hch@infradead.org
Subject: Re: [PATCH -v6 0/2] Fixing the issue with memory-mapped file times
Date: Fri, 18 Jan 2008 10:40:08 +0100	[thread overview]
Message-ID: <E1JFnho-0008TH-5G@pomaz-ex.szeredi.hu> (raw)
In-Reply-To: <12006091182260-git-send-email-salikhmetov@gmail.com> (message from Anton Salikhmetov on Fri, 18 Jan 2008 01:31:56 +0300)

> 4. Performance test was done using the program available from the
> following link:
> 
> http://bugzilla.kernel.org/attachment.cgi?id=14493
> 
> Result: the impact of the changes was negligible for files of a few
> hundred megabytes.

Could you also test with ext4 and post some numbers?  Afaik, ext4 uses
nanosecond timestamps, so the time updating code would be exercised
more during the page faults.

What about performance impact on msync(MS_ASYNC)?  Could you please do
some measurment of that as well?

Thanks,
Miklos


  parent reply	other threads:[~2008-01-18  9:40 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-17 22:31 Anton Salikhmetov
2008-01-17 22:31 ` [PATCH -v6 1/2] Massive code cleanup of sys_msync() Anton Salikhmetov
2008-01-18  9:33   ` Miklos Szeredi
2008-01-18 10:30     ` Anton Salikhmetov
2008-01-17 22:31 ` [PATCH -v6 2/2] Updating ctime and mtime for memory-mapped files Anton Salikhmetov
2008-01-18  9:51   ` Miklos Szeredi
2008-01-18 10:15     ` Peter Zijlstra
2008-01-18 10:25       ` Peter Zijlstra
2008-01-18 10:39         ` Anton Salikhmetov
2008-01-18 17:58         ` Linus Torvalds
2008-01-18 18:11           ` Miklos Szeredi
2008-01-18 18:28             ` Rik van Riel
2008-01-18 18:51               ` Miklos Szeredi
2008-01-18 18:43             ` Linus Torvalds
2008-01-18 18:57               ` Miklos Szeredi
2008-01-18 19:08                 ` Linus Torvalds
2008-01-18 19:22                   ` Miklos Szeredi
2008-01-18 19:35                     ` Linus Torvalds
2008-01-18 19:58                       ` Anton Salikhmetov
2008-01-18 20:22                         ` Linus Torvalds
2008-01-18 21:03                           ` Anton Salikhmetov
2008-01-18 21:27                             ` Linus Torvalds
2008-01-18 22:04                               ` Anton Salikhmetov
2008-01-18 22:21                                 ` Linus Torvalds
2008-01-18 22:35                                   ` Anton Salikhmetov
2008-01-18 22:32                       ` Ingo Oeser
2008-01-18 22:47                         ` Linus Torvalds
2008-01-18 22:54                           ` Rik van Riel
2008-01-19  0:50                             ` Matt Mackall
2008-01-19  4:25                               ` Rik van Riel
2008-01-19 10:22                               ` Miklos Szeredi
2008-01-19 15:49                                 ` Matt Mackall
2008-01-21 14:25                           ` Peter Staubach
2008-01-21 14:36                             ` Anton Salikhmetov
2008-01-18 10:38       ` Miklos Szeredi
2008-01-18 11:00         ` Peter Zijlstra
2008-01-18 11:17           ` Miklos Szeredi
2008-01-18 11:23             ` Peter Zijlstra
2008-01-18 11:36               ` Miklos Szeredi
2008-01-18  9:40 ` Miklos Szeredi [this message]
2008-01-18 10:31   ` [PATCH -v6 0/2] Fixing the issue with memory-mapped file times Anton Salikhmetov
2008-01-18 19:48   ` Anton Salikhmetov
2008-01-19 10:45     ` Miklos Szeredi

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