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authorChristoph Lameter <clameter@engr.sgi.com>2006-02-24 13:04:12 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-24 14:31:38 -0800
commit1e275d406bf6b88e4de6925cf594b64bb2ec49bc (patch)
tree6fe143317fbc442407244a3c55ecf475072a28f3 /drivers/video/macmodes.h
parentf68a106f224c21148c5264a429fac149dc7ad0ac (diff)
[PATCH] page migration: Fix MPOL_INTERLEAVE behavior for migration via mbind()
migrate_pages_to() allocates a list of new pages on the intended target node or with the intended policy and then uses the list of new pages as targets for the migration of a list of pages out of place. When the pages are allocated it is not clear which of the out of place pages will be moved to the new pages. So we cannot specify an address as needed by alloc_page_vma(). This causes problem for MPOL_INTERLEAVE which will currently allocate the pages on the first node of the set. If mbind is used with vma that has the policy of MPOL_INTERLEAVE then the interleaving of pages may be destroyed. This patch fixes that by generating a fake address for each alloc_page_vma which will result is a distribution of pages as prescribed by MPOL_INTERLEAVE. Lee also noted that the sequence of nodes for the new pages seems to be inverted. So we also invert the way the lists of pages for migration are build. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Looks-ok-to: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/video/macmodes.h')
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