Lee Schermerhorn
771fb4d806
mm: mempolicy: Check for misplaced page
...
This patch provides a new function to test whether a page resides
on a node that is appropriate for the mempolicy for the vma and
address where the page is supposed to be mapped. This involves
looking up the node where the page belongs. So, the function
returns that node so that it may be used to allocated the page
without consulting the policy again.
A subsequent patch will call this function from the fault path.
Because of this, I don't want to go ahead and allocate the page, e.g.,
via alloc_page_vma() only to have to free it if it has the correct
policy. So, I just mimic the alloc_page_vma() node computation
logic--sort of.
Note: we could use this function to implement a MPOL_MF_STRICT
behavior when migrating pages to match mbind() mempolicy--e.g.,
to ensure that pages in an interleaved range are reinterleaved
rather than left where they are when they reside on any page in
the interleave nodemask.
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com >
Reviewed-by: Rik van Riel <riel@redhat.com >
Cc: Andrew Morton <akpm@linux-foundation.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
[ Added MPOL_F_LAZY to trigger migrate-on-fault;
simplified code now that we don't have to bother
with special crap for interleaved ]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl >
Signed-off-by: Ingo Molnar <mingo@kernel.org >
Signed-off-by: Mel Gorman <mgorman@suse.de >
2012-12-11 14:42:41 +00:00
..
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