Messages in this thread | | | Date | Tue, 28 Jul 2009 16:52:45 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 1/1] pagemap clear_refs: modify to specify anon or mapped vma clearing |
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On Tue, 28 Jul 2009 15:52:05 -0700 "Moussa A. Ba" <moussa.a.ba@gmail.com> wrote:
> This patch adds anonymous and file backed filters to the clear_refs interface. > echo 1 > /proc/PID/clear_refs resets the bits on all pages > echo 2 > /proc/PID/clear_refs resets the bits on anonymous pages only > echo 3 > /proc/PID/clear_refs resets the bits on file backed pages only > Any other value is ignored
The changelog is missing any rationale for making this change. Originally we were told that it "makes the clear_refs proc interface a bit more versatile", but that's a bit thin.
How do we justify making this change to Linux? What value does it have? Can you describe a usage scenario which would help people understand the usefulness of the change?
Thanks.
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