Hugh Dickins cf4b769abb mm: page migration avoid touching newpage until no going back ... We have had trouble in the past from the way in which page migration's newpage is initialized in dribs and drabs - see commit 8bdd638091 ("mm: fix direct reclaim writeback regression") which proposed a cleanup. We have no actual problem now, but I think the procedure would be clearer (and alternative get_new_page pools safer to implement) if we assert that newpage is not touched until we are sure that it's going to be used - except for taking the trylock on it in __unmap_and_move(). So shift the early initializations from move_to_new_page() into migrate_page_move_mapping(), mapping and NULL-mapping paths. Similarly migrate_huge_page_move_mapping(), but its NULL-mapping path can just be deleted: you cannot reach hugetlbfs_migrate_page() with a NULL mapping. Adjust stages 3 to 8 in the Documentation file accordingly. Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Rik van Riel <riel@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2015-11-05 19:34:48 -08:00
..
.gitignore
00-INDEX	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
active_mm.txt
balance
cleancache.txt	cleancache: forbid overriding cleancache_ops	2015-04-14 16:49:03 -07:00
frontswap.txt
highmem.txt
hugetlbpage.txt	Documentation: update libhugetlbfs location and use for testing	2015-09-08 15:35:28 -07:00
hwpoison.txt
idle_page_tracking.txt	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
ksm.txt
numa
numa_memory_policy.txt
overcommit-accounting
page_migration	mm: page migration avoid touching newpage until no going back	2015-11-05 19:34:48 -08:00
page_owner.txt	Documentation: add new page_owner document	2014-12-13 12:42:48 -08:00
pagemap.txt	proc: export idle flag via kpageflags	2015-09-10 13:29:01 -07:00
remap_file_pages.txt	mm: replace remap_file_pages() syscall with emulation	2015-02-10 14:30:30 -08:00
slub.txt	Doc/slub: document slabinfo-gnuplot.sh script	2015-11-05 19:34:48 -08:00
soft-dirty.txt
split_page_table_lock
transhuge.txt	Documentation/vm/transhuge.txt: add information about max_ptes_swap	2015-11-05 19:34:48 -08:00
unevictable-lru.txt	mm: rmap use pte lock not mmap_sem to set PageMlocked	2015-11-05 19:34:48 -08:00
userfaultfd.txt	userfaultfd: change the read API to return a uffd_msg	2015-09-04 16:54:41 -07:00
zsmalloc.txt	zsmalloc: zsmalloc documentation	2015-04-15 16:35:21 -07:00
zswap.txt	zswap: update docs for runtime-changeable attributes	2015-09-10 13:29:01 -07:00