forked from luck/tmp_suning_uos_patched
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@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -973,8 +973,10 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
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spin_lock(&mm->page_table_lock);
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put_page(page);
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if (unlikely(!pmd_same(*pmd, orig_pmd))) {
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spin_unlock(&mm->page_table_lock);
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mem_cgroup_uncharge_page(new_page);
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put_page(new_page);
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goto out;
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} else {
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pmd_t entry;
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VM_BUG_ON(!PageHead(page));
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