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authorDean Nelson <dnelson@redhat.com>2012-03-21 16:34:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-21 17:54:58 -0700
commit385de35722c9a22917e7bc5e63cd83a8cffa5ecd (patch)
tree41ae2e23e096d189cdf614cf1eaf0c8f9ddeeb3b /mm/migrate.c
parent6d9d88d07e132259c35f9493b15429e19198489c (diff)
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thp: allow a hwpoisoned head page to be put back to LRU
Andrea Arcangeli pointed out to me that a check in __memory_failure() which was intended to prevent THP tail pages from being checked for the absence of the PG_lru flag (something that is always the case), was also preventing THP head pages from being checked. A THP head page could actually benefit from the call to shake_page() by ending up being put back to a LRU, provided it had been waiting in a pagevec array. Andrea suggested that the "!PageTransCompound(p)" in the if-statement should be replaced by a "!PageTransTail(p)", thus allowing THP head pages to be checked and possibly shaken. Signed-off-by: Dean Nelson <dnelson@redhat.com> Cc: Jin Dongming <jin.dongming@np.css.fujitsu.com> Reviewed-by: Andrea Arcangeli <aarcange@redhat.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
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