linux-kernel - Re: [RFC] bitmap relative operator for mempolicy extensions

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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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