The patch titled
Subject: mm: memcontrol: clarify migration where old page is uncharged
has been removed from the -mm tree. Its filename was
mm-memcontrol-clarify-migration-where-old-page-is-uncharged.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: memcontrol: clarify migration where old page is uncharged
Better explain re-entrant migration when compaction races with reclaim,
and also mention swapcache readahead pages as possible uncharged migration
sources.
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff -puN mm/memcontrol.c~mm-memcontrol-clarify-migration-where-old-page-is-uncharged mm/memcontrol.c
--- a/mm/memcontrol.c~mm-memcontrol-clarify-migration-where-old-page-is-uncharged
+++ a/mm/memcontrol.c
@@ -6157,7 +6157,12 @@ void mem_cgroup_migrate(struct page *old
if (PageCgroupUsed(pc))
return;
- /* Re-entrant migration: old page already uncharged? */
+ /*
+ * Swapcache readahead pages can get migrated before being
+ * charged, and migration from compaction can happen to an
+ * uncharged page when the PFN walker finds a page that
+ * reclaim just put back on the LRU but has not released yet.
+ */
pc = lookup_page_cgroup(oldpage);
if (!PageCgroupUsed(pc))
return;
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
origin.patch
memcg-__mem_cgroup_free-remove-stale-disarm_static_keys-comment.patch
memcg-dont-check-mm-in-__memcg_kmem_get_cachenewpage_charge.patch
memcg-do-not-abuse-memcg_kmem_skip_account.patch
mm-page_allocc-__alloc_pages_nodemask-dont-alter-arg-gfp_mask.patch
mm-mincore-add-hwpoison-page-handle.patch
memcg-zap-kmem_account_flags.patch
memcg-only-check-memcg_kmem_skip_account-in-__memcg_kmem_get_cache.patch
memcg-turn-memcg_kmem_skip_account-into-a-bit-field.patch
mm-move-swp_entry_t-definition-to-include-linux-mm_typesh.patch
mm-gfp-escalatedly-define-gfp_highuser-and-gfp_highuser_movable.patch
mm-page_ext-resurrect-struct-page-extending-code-for-debugging.patch
mm-page_ext-resurrect-struct-page-extending-code-for-debugging-fix.patch
mm-debug-pagealloc-prepare-boottime-configurable-on-off.patch
mm-debug-pagealloc-make-debug-pagealloc-boottime-configurable.patch
mm-debug-pagealloc-make-debug-pagealloc-boottime-configurable-fix.patch
mm-nommu-use-alloc_pages_exact-rather-than-its-own-implementation.patch
stacktrace-introduce-snprint_stack_trace-for-buffer-output.patch
mm-page_owner-keep-track-of-page-owners.patch
mm-page_owner-correct-owner-information-for-early-allocated-pages.patch
documentation-add-new-page_owner-document.patch
mm-vmscan-invoke-slab-shrinkers-from-shrink_zone.patch
mm-vmscan-invoke-slab-shrinkers-from-shrink_zone-fix.patch
mm-page_alloc-embed-oom-killing-naturally-into-allocation-slowpath.patch
mm-memcontrol-fix-defined-but-not-used-compiler-warning.patch
memcg-fix-possible-use-after-free-in-memcg_kmem_get_cache.patch
mm-memcontrolc-cleaning-up-function-that-are-not-used-anywhere.patch
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