On Tue, 28 May 2013 15:52:51 -0400 Naoya Horiguchi <[email protected]> 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 <[email protected]> > Reviewed-by: Rik van Riel <[email protected]> > Cc: [email protected] # 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
