ClockPro in Linux MM

ClockPro in Linux MM

[Zheng Da]

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Hello,

I try to understand the Linux memory management. I was told Linux uses
ClockPro to manage page cache
and http://linux-mm.org/PageReplacementDesign also says so for file pages.
But when I read the ClockPro paper,
it doesn't look the same. The Linux implementation doesn't have
non-resident pages. Other than
that, it doesn't have the same test period mentioned in the paper. I wonder
if the Linux implementation
have the same effect as ClockPro. Could anyone confirm Linux is still using
ClockPro?

Thanks,
Da

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Re: ClockPro in Linux MM

[Christoph Lameter]

On Mon, 12 Mar 2012, Zheng Da wrote:

> I try to understand the Linux memory management. I was told Linux uses
> ClockPro to manage page cache
> and http://linux-mm.org/PageReplacementDesign also says so for file pages.
> But when I read the ClockPro paper,
> it doesn't look the same. The Linux implementation doesn't have
> non-resident pages. Other than
> that, it doesn't have the same test period mentioned in the paper. I wonder
> if the Linux implementation
> have the same effect as ClockPro. Could anyone confirm Linux is still using
> ClockPro?

That Linux is using Clockpro is news to me. Linux Memory management uses
some ideas from Clockpro to improve reclaim etc but it does not implement ClockPro.

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Re: ClockPro in Linux MM

[Zheng Da]

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I know the implementation is different. Linux implementation doesn't have
the clock heads.
But I get a feel that the essence is the same except that Linux version
doesn't have non-resident pages.

Da

On Mon, Mar 12, 2012 at 12:04 PM, Christoph Lameter <cl@linux.com> wrote:

> On Mon, 12 Mar 2012, Zheng Da wrote:
>
> > I try to understand the Linux memory management. I was told Linux uses
> > ClockPro to manage page cache
> > and http://linux-mm.org/PageReplacementDesign also says so for file
> pages.
> > But when I read the ClockPro paper,
> > it doesn't look the same. The Linux implementation doesn't have
> > non-resident pages. Other than
> > that, it doesn't have the same test period mentioned in the paper. I
> wonder
> > if the Linux implementation
> > have the same effect as ClockPro. Could anyone confirm Linux is still
> using
> > ClockPro?
>
> That Linux is using Clockpro is news to me. Linux Memory management uses
> some ideas from Clockpro to improve reclaim etc but it does not implement
> ClockPro.
>
>

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