Re: [PATCH 1/1] pagemap clear_refs: modify to specify anon ormapped vma clearing

[Matt Mackall]

On Mon, 2009-07-27 at 13:19 -0700, Moussa A. Ba wrote:
> This patch makes the clear_refs proc interface a bit more versatile.
> It adds support  for clearing anonymous pages, file mapped pages or both.
> 
> The clear_refs entry is used to reset the Referenced bits on virtual and
> physical pages associated with a process.
> echo 1 > /proc/PID/clear_refs clears all pages associated with the process
> echo 2 > /proc/PID/clear_refs clears anonymous pages only
> echo 3 > /proc/PID/clear_refs clears file mapped pages only
> Any other value written to the proc entry will clear all pages.
> 
> Selective clearing the pages has a measurable impact on performance as it
> limits the number of page walks.  We have been using this interface and  this
> adds flexibility to the user user space application implementing the reference
> clearing.

Looks ok to me.

Acked-by: Matt Mackall <mpm@xxxxxxxxxxx>

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