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Message-ID: <2f11576a0802140611h261b9df2qd13406e562f52864@mail.gmail.com>
Date: Thu, 14 Feb 2008 23:11:12 +0900
From: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>
To: "Paul Jackson" <pj@sgi.com>
Subject: Re: [RFC] bitmap relative operator for mempolicy extensions
Cc: "David Rientjes" <rientjes@google.com>, Lee.Schermerhorn@hp.com,
       mel@csn.ul.ie, ak@suse.de, linux-kernel@vger.kernel.org,
       akpm@linux-foundation.org, clameter@sgi.com
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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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