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authorWei Yang <richardw.yang@linux.intel.com>2020-01-30 22:11:20 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-01-31 10:30:36 -0800
commitfac0516b5534897bf4c4a88daa06a8cfa5611b23 (patch)
tree8943a302c35816af61caafebba9ff1b3e023e695 /mm
parentf1037ec0cc8ac1a450974ad9754e991f72884f48 (diff)
mm: thp: don't need care deferred split queue in memcg charge move path
If compound is true, this means it is a PMD mapped THP. Which implies the page is not linked to any defer list. So the first code chunk will not be executed. Also with this reason, it would not be proper to add this page to a defer list. So the second code chunk is not correct. Based on this, we should remove the defer list related code. [yang.shi@linux.alibaba.com: better patch title] Link: http://lkml.kernel.org/r/20200117233836.3434-1-richardw.yang@linux.intel.com Fixes: 87eaceb3faa5 ("mm: thp: make deferred split shrinker memcg aware") Signed-off-by: Wei Yang <richardw.yang@linux.intel.com> Suggested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Yang Shi <yang.shi@linux.alibaba.com> Cc: David Rientjes <rientjes@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: <stable@vger.kernel.org> [5.4+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c18
1 files changed, 0 insertions, 18 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6c83cf4ed970..27c231bf4565 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5340,14 +5340,6 @@ static int mem_cgroup_move_account(struct page *page,
__mod_lruvec_state(to_vec, NR_WRITEBACK, nr_pages);
}
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
- if (compound && !list_empty(page_deferred_list(page))) {
- spin_lock(&from->deferred_split_queue.split_queue_lock);
- list_del_init(page_deferred_list(page));
- from->deferred_split_queue.split_queue_len--;
- spin_unlock(&from->deferred_split_queue.split_queue_lock);
- }
-#endif
/*
* It is safe to change page->mem_cgroup here because the page
* is referenced, charged, and isolated - we can't race with
@@ -5357,16 +5349,6 @@ static int mem_cgroup_move_account(struct page *page,
/* caller should have done css_get */
page->mem_cgroup = to;
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
- if (compound && list_empty(page_deferred_list(page))) {
- spin_lock(&to->deferred_split_queue.split_queue_lock);
- list_add_tail(page_deferred_list(page),
- &to->deferred_split_queue.split_queue);
- to->deferred_split_queue.split_queue_len++;
- spin_unlock(&to->deferred_split_queue.split_queue_lock);
- }
-#endif
-
spin_unlock_irqrestore(&from->move_lock, flags);
ret = 0;