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| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2013-06-12 14:05:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-06-12 16:29:46 -0700 |
| commit | 30dad30922ccc733cfdbfe232090cf674dc374dc (patch) | |
| tree | 7663089f93435ea0c298eb69058ca834c109f530 /kernel/groups.c | |
| parent | 27749f2ff0717e115680922000839ad6a576eddf (diff) | |
| download | linux-stable-30dad30922ccc733cfdbfe232090cf674dc374dc.tar.gz linux-stable-30dad30922ccc733cfdbfe232090cf674dc374dc.tar.bz2 linux-stable-30dad30922ccc733cfdbfe232090cf674dc374dc.zip | |
mm: migration: add migrate_entry_wait_huge()
When we have a page fault for the address which is backed by a hugepage
under migration, the kernel can't wait correctly and do busy looping on
hugepage fault until the migration finishes. As a result, users who try
to kick hugepage migration (via soft offlining, for example) occasionally
experience long delay or soft lockup.
This is because pte_offset_map_lock() can't get a correct migration entry
or a correct page table lock for hugepage. This patch introduces
migration_entry_wait_huge() to solve this.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: <stable@vger.kernel.org> [2.6.35+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/groups.c')
0 files changed, 0 insertions, 0 deletions