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Vlastimil Babka
5f155f27cb
When updating task's mems_allowed and rebinding its mempolicy due to cpuset's mems being changed, we currently only take the seqlock for writing when either the task has a mempolicy, or the new mems has no intersection with the old mems. This should be enough to prevent a parallel allocation seeing no available nodes, but the optimization is IMHO unnecessary (cpuset updates should not be frequent), and we still potentially risk issues if the intersection of new and old nodes has limited amount of free/reclaimable memory. Let's just use the seqlock for all tasks. Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Vlastimil Babka <[email protected]> Acked-by: Michal Hocko <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Anshuman Khandual <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: David Rientjes <[email protected]> Cc: Dimitri Sivanich <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Li Zefan <[email protected]> Cc: Mel Gorman <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>