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authorKonstantin Khlebnikov <khlebnikov@openvz.org>2012-01-20 14:34:24 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-23 08:38:49 -0800
commit9f9f1acd713d69fae2af286fbeedc6c8963411c6 (patch)
treecfa1485d01cb36c720f1e2b96b21748acc10ec06 /arch/score/kernel
parent245132643e1cfcd145bbc86a716c1818371fcb93 (diff)
mm: fix rss count leakage during migration
Memory migration fills a pte with a migration entry and it doesn't update the rss counters. Then it replaces the migration entry with the new page (or the old one if migration failed). But between these two passes this pte can be unmaped, or a task can fork a child and it will get a copy of this migration entry. Nobody accounts for this in the rss counters. This patch properly adjust rss counters for migration entries in zap_pte_range() and copy_one_pte(). Thus we avoid extra atomic operations on the migration fast-path. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Hugh Dickins <hughd@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/score/kernel')
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