On Tue, 28 May 2013 15:52:51 -0400 Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> wrote: > 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. > 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. > > Note that the caller, hugetlb_fault(), gets the pointer to the "leaf" > entry with huge_pte_offset() inside which all the arch-dependency of > the page table structure are. So migration_entry_wait_huge() and > __migration_entry_wait() are free from arch-dependency. > > ChangeLog v3: > - use huge_pte_lockptr > > ChangeLog v2: > - remove dup in migrate_entry_wait_huge() > > Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> > Reviewed-by: Rik van Riel <riel@xxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx # 2.6.35 That changelog is not suitable for a -stable patch. People who maintain and utilize the stable trees need to know in some detail what is the end-user impact of the patch (or, equivalently, of the bug which the patch fixes). -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>