scan_mapping_unevictable_pages() is used to make SysV SHM_LOCKed pages evictable again once the shared memory is unlocked or destroyed (the latter seems rather a waste of time, but meets internal expectations). It does pagevec_lookup()s across the whole object: methinks a cond_resched() every PAGEVEC_SIZE pages would be worthwhile. Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx> --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- mmotm.orig/mm/vmscan.c 2011-12-28 16:49:36.000000000 -0800 +++ mmotm/mm/vmscan.c 2011-12-28 17:03:07.647220248 -0800 @@ -3583,8 +3583,8 @@ void scan_mapping_unevictable_pages(stru pagevec_release(&pvec); count_vm_events(UNEVICTABLE_PGSCANNED, pg_scanned); + cond_resched(); } - } static void warn_scan_unevictable_pages(void) -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>