From: Valdis.Kletnieks@vt.edu
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: mmotm 2011-04-29 - wonky VmRSS and VmHWM values after swapping
Date: Mon, 02 May 2011 10:37:22 -0400 [thread overview]
Message-ID: <8185.1304347042@localhost> (raw)
In-Reply-To: Your message of "Sun, 01 May 2011 20:26:54 EDT." <49683.1304296014@localhost>
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On Sun, 01 May 2011 20:26:54 EDT, Valdis.Kletnieks@vt.edu said:
> On Fri, 29 Apr 2011 16:26:16 PDT, akpm@linux-foundation.org said:
> > The mm-of-the-moment snapshot 2011-04-29-16-25 has been uploaded to
> >
> > http://userweb.kernel.org/~akpm/mmotm/
>
> Dell Latitude E6500 laptop, Core2 Due P8700, 4G RAM, 2G swap.Z86_64 kernel.
>
> I was running a backup of the system to an external USB hard drive.
Is a red herring. Am seeing it again, after only 20 minutes of uptime, and so
far I've only gotten 1.2G or so into the 4G ram (2.5G still free), and never
touched swap yet.
Aha! I have a reproducer (found while composing this note). /bin/su will
reliably trigger it (4 tries out of 4, launching from a bash shell that itself
has sane VmRSS and VmHWM values). So it's a specific code sequence doing it
(probably one syscall doing something quirky).
Now if I could figure out how to make strace look at the VmRSS after each
syscall, or get gdb to do similar. Any suggestions? Am open to perf/other
solutions as well, if anybody has one handy...
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next prev parent reply other threads:[~2011-05-02 14:37 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-29 23:26 mmotm 2011-04-29-16-25 uploaded akpm
2011-04-30 16:46 ` Randy Dunlap
2011-05-01 7:47 ` KOSAKI Motohiro
2011-05-02 15:46 ` Randy Dunlap
2011-05-01 2:35 ` [PATCH] mmotm: fix hang at startup Hugh Dickins
2011-05-01 3:25 ` Wu Fengguang
2011-05-02 0:26 ` mmotm 2011-04-29 - wonky VmRSS and VmHWM values after swapping Valdis.Kletnieks
2011-05-02 14:37 ` Valdis.Kletnieks [this message]
2011-05-02 23:44 ` Andrew Morton
2011-05-02 23:57 ` Valdis.Kletnieks
2011-05-10 16:04 ` Peter Zijlstra
2011-05-11 22:53 ` Andrew Morton
2011-05-12 1:08 ` Valdis.Kletnieks
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