Re: [RFC 0/8] Cpuset aware writeback

[Paul Jackson]

Andrew wrote:
> - consider going off-cpuset for critical allocations. 

We do ... in mm/page_alloc.c:

         * This is the last chance, in general, before the goto nopage.
         * Ignore cpuset if GFP_ATOMIC (!wait) rather than fail alloc.
         * See also cpuset_zone_allowed() comment in kernel/cpuset.c.
         */
        page = get_page_from_freelist(gfp_mask, order, zonelist, alloc_flags);

We also allow GFP_KERNEL requests to escape the current cpuset, to the nearest
enclosing mem_exclusive cpuset, which is typically a big cpuset covering most
of the system.

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