The patch titled mm: consider the entire user address space during node migration has been added to the -mm tree. Its filename is mm-consider-the-entire-user-address-space-during-node-migration.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: mm: consider the entire user address space during node migration From: Greg Thelen <gthelen@xxxxxxxxxx> Use mm->task_size instead of TASK_SIZE to ensure that the entire user address space is migrated. mm->task_size is independent of the calling task context. TASK SIZE may be dependant on the address space size of the calling process. Usage of TASK_SIZE can lead to partial address space migration if the calling process was 32 bit and the migrating process was 64 bit. Here is the test script used on 64 system with a 32 bit echo process: mount -t cgroup none /cgroup -o cpuset cd /cgroup mkdir 0 echo 1 > 0/cpuset.cpus echo 0 > 0/cpuset.mems echo 1 > 0/cpuset.memory_migrate mkdir 1 echo 1 > 1/cpuset.cpus echo 1 > 1/cpuset.mems echo 1 > 1/cpuset.memory_migrate echo $$ > 0/tasks 64_bit_process & pid=$! echo $pid > 1/tasks # This does not migrate all process pages without # this patch. If 64 bit echo is used or this patch is # applied, then the full address space of $pid is # migrated. To check memory migration, I watched: grep MemUsed /sys/devices/system/node/node*/meminfo Signed-off-by: Greg Thelen <gthelen@xxxxxxxxxx> Acked-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> Cc: Mel Gorman <mel@xxxxxxxxx> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Cc: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx> Cc: Balbir Singh <balbir@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/mempolicy.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN mm/mempolicy.c~mm-consider-the-entire-user-address-space-during-node-migration mm/mempolicy.c --- a/mm/mempolicy.c~mm-consider-the-entire-user-address-space-during-node-migration +++ a/mm/mempolicy.c @@ -928,7 +928,7 @@ static int migrate_to_node(struct mm_str nodes_clear(nmask); node_set(source, nmask); - check_range(mm, mm->mmap->vm_start, TASK_SIZE, &nmask, + check_range(mm, mm->mmap->vm_start, mm->task_size, &nmask, flags | MPOL_MF_DISCONTIG_OK, &pagelist); if (!list_empty(&pagelist)) _ Patches currently in -mm which might be from gthelen@xxxxxxxxxx are linux-next.patch sparsemem-on-no-vmemmap-path-put-mem_map-on-node-high-too.patch mm-consider-the-entire-user-address-space-during-node-migration.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html