Re: [RFC] bitmap relative operator for mempolicy extensions

[KOSAKI Motohiro]

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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