Le 09/05/2012 10:58, Zhouping Liu a écrit : > hi, all > > Recently, I found an error in move_pages syscall: > > depending on move_pages(2), when page is not present, > it should fail with ENOENT, in fact, it's ok without > any errno. > > the following reproducer can easily reproduce > the issue, suggest you get more details by strace. > inside reproducer, I try to move a non-exist page from > node 1 to node 0. > If I understand correctly, 3 pages should migrate properly but the last one cannot migrate because it's not present. In this case, move_pages returns success. -ENOENT is set in the status array, not in the return value/errno. In the past, if *all* pages failed to migrate, move_pages would return ENOENT instead of success, but the behavior was inconsistent so I changed that in commit e78bbfa8262424417a29349a8064a535053912b9 as Wanlong Gao said. But that should not matter here since 3 pages out of 4 are successfully migrated from what I understand. The manpage should be updated (remove ENOENT from the ERRORS section, but keep it in the "Page states in the status array" section). Brice -- 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>