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Message-ID: <2f11576a0802140611h261b9df2qd13406e562f52864@mail.gmail.com>
Date: Thu, 14 Feb 2008 23:11:12 +0900
From: "KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
To: "Paul Jackson" <pj@....com>
Cc: "David Rientjes" <rientjes@...gle.com>, Lee.Schermerhorn@...com,
mel@....ul.ie, ak@...e.de, linux-kernel@...r.kernel.org,
akpm@...ux-foundation.org, clameter@....com
Subject: Re: [RFC] bitmap relative operator for mempolicy extensions
Hi Paul,
> The following adds one more bitmap operator, with the usual
> cpumask and nodemask wrappers. This operator computes one
> bitmap relative to another. If the n-th bit in the origin
> mask is set, then the m-th bit of the destination mask will
> be set, where m is the position of the n-th set bit in the
> relative mask.
this patch is very interesting.
BTW:
Are you think this function name must be "relative" ?
I think "relative" implies ordered set.
but linux bitmap is abstraction of unordered set.
if possible, i prefer another name.
end up, bitmap_relative is map as pecial case, i think.
> This is initially to be used by the MPOL_F_RELATIVE_NODES
> facility being considered for mm/mempolicy.c.
agreed with node_relative idea.
I think this is very useful.
Thanks!
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