linux-kernel - Re: man-pages text for MAV_MERGEABLE and MADV

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Date:	Mon, 21 Jun 2010 09:11:23 -0700
From:	Hugh Dickins <hughd@...gle.com>
To:	mtk.manpages@...il.com
Cc:	Andi Kleen <andi@...stfloor.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-man <linux-man@...r.kernel.org>
Subject: Re: man-pages text for MAV_MERGEABLE and MADV_UNMERGEABLE

On Sat, Jun 19, 2010 at 10:36 PM, Michael Kerrisk
<mtk.manpages@...il.com> wrote:
> On Sun, Jun 20, 2010 at 2:02 AM, Hugh Dickins <hughd@...gle.com> wrote:
>> On Sat, 19 Jun 2010, Michael Kerrisk wrote:
>>> +The KSM daemon
>>> +.RI ( ksmd )
>>> +periodically scans those areas of user memory that have
>>> +been marked as mergeable,
>>> +looking for pages with identical content.
>>
>> I was rather puzzled by Andi calling that an internal implementation
>> detail.  Okay, I suppose the "KSM daemon periodically scans" is an
>> internal implementation detail, though I think it helps to warn the
>> programmer of the overhead of MADV_MERGEABLE; but without "pages
>> with identical content", aren't we left mystified as to just what
>> this "merging" is all about?
>
> I agree. All I had changed was to remove mention of the KSM daemon --
> I just say "the kernel".

Great, that's just right: thanks.

Hugh
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