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Message-Id: <20090728165245.65d5cb23.akpm@linux-foundation.org> Date: Tue, 28 Jul 2009 16:52:45 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: "Moussa A. Ba" <moussa.a.ba@...il.com> Cc: linux-kernel@...r.kernel.org, rientjes@...gle.com, xiyou.wangcong@...il.com, adobriyan@...il.com, mpm@...enic.com, mel@....ul.ie, yinghan@...gle.com, npiggin@...e.de, jaredeh@...il.com Subject: Re: [PATCH 1/1] pagemap clear_refs: modify to specify anon or mapped vma clearing On Tue, 28 Jul 2009 15:52:05 -0700 "Moussa A. Ba" <moussa.a.ba@...il.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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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