Re: [RFC] Slab: Enforce clean node lists per zone, add policy support and fallback

[Paul Jackson <pj@sgi.com>]

Christoph wrote:
> Currently the allocations may be redirected via cpusets to other nodes. 

Minor picky point of terminology ... I wouldn't say that cpusets
"redirect" the allocation, but "force" or "constrain" it.  To my way
of speaking, a "redirect" would apply if the rule was "allocations
on node 6 should be satisfied on (redirected to) node 9", for
example.  A forced constraint applies if the rule is "I don't care
what you asked for buddy - you're getting node 9, period."

Separate point - I think we already have a workaround in place for
the migration case to keep cpuset constraints out of the way.  See
the overwriting of tsk->mems_allowed in the kernel/cpuset.c routine
cpuset_migrate_mm().  With Christoph's new __GFP_THISNODE, or whatever
alloc_pages_exact_node() with limited zonelist equivalent we come up
with, we don't need both that and the cpuset_migrate_mm() workaround.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@sgi.com> 1.925.600.0401

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