On Mon, 20 Aug 2012, Mel Gorman wrote: > Ideally, the shared policy handling would be rewritten to either properly > handle COW of the policy structures or at least reference count MPOL_F_SHARED > based exclusively on information within the policy. However, this patch takes > the easier approach of disabling any policy sharing between VMAs. Each new > range allocated with sp_alloc will allocate a new policy, set the reference > count to 1 and drop the reference count of the old policy. This increases > the memory footprint but is not expected to be a major problem as mbind() > is unlikely to be used for fine-grained ranges. It is also inefficient > because it means we allocate a new policy even in cases where mbind_range() > could use the new_policy passed to it. However, it is more straight-forward > and the change should be invisible to the user. Hmmm. I dont like the additional memory use but this is definitely an issue that needs addressing. Reviewed-by: Christoph Lameter <cl@xxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>