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

[Christoph Lameter <clameter@sgi.com>]

On Tue, 8 Aug 2006, Paul Jackson wrote:

> 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.

You are confusing two issues in the migration code. The case of 
sys_migrate_page was fixed by you by changing the cpuset context. Thats 
fine and we do not need __GFP_THISNODE there because the page are to be 
allocated in conformity with a cpuset context of a process.

In the case of sys_move_pages we move individual pages to particular 
nodes. There we do not want to have cpuset redirection by constraints or 
mempolicy influences.

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