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From: Jeff Davis <>
Subject: Re: [PATCH] badness() dramatically overcounts memory
Date: Tue, 05 Feb 2008 15:02:41 -0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Tue, 2008-02-05 at 09:43 +0530, Balbir Singh wrote:
> 1. grep on the kernel source tells me that shared_vm is incremented only in
>    vm_stat_account(), which is a NO-OP if CONFIG_PROC_FS is not defined.

I see, thanks for pointing that out. Is there another way do you think?
Would the penalty be to high to enable vm_stat_account when
CONFIG_PROC_FS is not defined?

Or perhaps my patch would only have an effect when CONFIG_PROC_FS is set
(which is default)?

> 2. How have you tested these patches? One way to do it would be to use the
>    memory controller and set a small limit on the control group. A memory
>    intensive application will soon see an OOM.

I have done a quick test a while back when I first wrote the patch. I
will test more thoroughly now.

> The interesting thing is the use of total_vm and not the RSS which is used as
> the basis by the OOM killer. I need to read/understand the code a bit more.

RSS makes more sense to me as well.

To me, it makes no sense to count shared memory, because killing a
process doesn't free the shared memory.

	Jeff Davis

  reply	other threads:[~2008-02-05 23:02 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
2008-02-05  4:13 ` Balbir Singh
2008-02-05 23:02   ` Jeff Davis [this message]
2008-02-05 23:09     ` David Rientjes
2008-02-06  1:54       ` KOSAKI Motohiro
2008-02-06  2:05         ` David Rientjes
2008-02-06  4:00         ` Balbir Singh

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