linux-kernel - Re: VM question - accounting of SysV SHM

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Message-ID: <75b66ecd0710171411n55efdb5bt8e9627301ed9088e@mail.gmail.com>
Date:	Wed, 17 Oct 2007 17:11:30 -0400
From:	"Lee Revell" <rlrevell@...-job.com>
To:	"Rik van Riel" <riel@...hat.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: VM question - accounting of SysV SHM

On 10/17/07, Rik van Riel <riel@...hat.com> wrote:
> On Wed, 17 Oct 2007 16:49:07 -0400
> "Lee Revell" <rlrevell@...-job.com> wrote:
>
> > Sorry to ask this question on the list but I've Googled and found
> > nothing.
> >
> > Is system V shared memory accounted for as Cached, or as normal
> > application memory?
>
> Cached.
>
> Shared memory segments basically are tmpfs files.

Thanks!

Are there any plans to track it separately in a future kernel release?

I've also noticed that if huge pages are used for the shared memory,
they are not accounted for as cached - I have a 56GB huge page pool
but cached is only 6GB.  Is this behavior specific to huge pages?

Finally, are these quirks documented anywhere?

Lee
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