On Mon, Feb 20, 2012 at 04:10:40PM -0500, Dean Nelson wrote:

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 <redacted>

Reviewed-by: Andrea Arcangeli <redacted>

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