The patch titled
Subject: mm, thp: drop page_table_lock to uncharge memcg pages
has been removed from the -mm tree. Its filename was
mm-thp-drop-page_table_lock-to-uncharge-memcg-pages.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
From: David Rientjes <rientjes@xxxxxxxxxx>
Subject: mm, thp: drop page_table_lock to uncharge memcg pages
mm->page_table_lock is hotly contested for page fault tests and isn't
necessary to do mem_cgroup_uncharge_page() in do_huge_pmd_wp_page().
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN mm/huge_memory.c~mm-thp-drop-page_table_lock-to-uncharge-memcg-pages mm/huge_memory.c
--- a/mm/huge_memory.c~mm-thp-drop-page_table_lock-to-uncharge-memcg-pages
+++ a/mm/huge_memory.c
@@ -973,8 +973,10 @@ int do_huge_pmd_wp_page(struct mm_struct
spin_lock(&mm->page_table_lock);
put_page(page);
if (unlikely(!pmd_same(*pmd, orig_pmd))) {
+ spin_unlock(&mm->page_table_lock);
mem_cgroup_uncharge_page(new_page);
put_page(new_page);
+ goto out;
} else {
pmd_t entry;
VM_BUG_ON(!PageHead(page));
_
Patches currently in -mm which might be from rientjes@xxxxxxxxxx are
origin.patch
linux-next.patch
slab-move-full-state-transition-to-an-initcall.patch
hugetlb-rename-max_hstate-to-hugetlb_max_hstate.patch
hugetlbfs-add-an-inline-helper-for-finding-hstate-index-fix.patch
hugetlb-simplify-migrate_huge_page.patch
hugetlb-simplify-migrate_huge_page-fix.patch
memcg-add-hugetlb-extension-fix.patch
memcg-add-hugetlb-extension-fix-fix.patch
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