The patch titled
Subject: mm, thp: drop page_table_lock to uncharge memcg pages
has been added to the -mm tree. Its filename is
mm-thp-drop-page_table_lock-to-uncharge-memcg-pages.patch
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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>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
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));
_
Subject: Subject: mm, thp: drop page_table_lock to uncharge memcg pages
Patches currently in -mm which might be from rientjes@xxxxxxxxxx are
mm-hugetlb-fix-warning-in-alloc_huge_page-dequeue_huge_page_vma.patch
linux-next.patch
mm-memory_failure-let-the-compiler-add-the-function-name.patch
mm-mempolicyc-use-enum-value-mpol_rebind_once-instead-of-0-in-mpol_rebind_policy.patch
mm-hugetlbc-cleanup-to-use-long-vars-instead-of-int-in-region_count.patch
mm-thp-remove-unnecessary-ret-variable.patch
mm-thp-allow-fallback-when-pte_alloc_one-fails-for-huge-pmd.patch
mm-vmstatc-remov-debug-fs-entries-on-failure-of-file-creation-and-made-extfrag_debug_root-dentry-local.patch
thp-memcg-split-hugepage-for-memcg-oom-on-cow.patch
mm-thp-drop-page_table_lock-to-uncharge-memcg-pages.patch
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