[merged] mm-hugetlb-avoid-unnecessary-hugetlb_acct_memory-call.patch removed from -mm tree

[merged] mm-hugetlb-avoid-unnecessary-hugetlb_acct_memory-call.patch removed from -mm tree

[akpm]

The patch titled
     Subject: mm/hugetlb: avoid unnecessary hugetlb_acct_memory() call
has been removed from the -mm tree.  Its filename was
     mm-hugetlb-avoid-unnecessary-hugetlb_acct_memory-call.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Miaohe Lin <linmiaohe@huawei.com>
Subject: mm/hugetlb: avoid unnecessary hugetlb_acct_memory() call

When reservation accounting remains unchanged, hugetlb_acct_memory() will
do nothing except holding and releasing hugetlb_lock.  We should avoid
this unnecessary hugetlb_lock lock/unlock cycle which is happening on
'most' hugetlb munmap operations by check delta against 0 at the beginning
of hugetlb_acct_memory.

Link: https://lkml.kernel.org/r/20210115092013.61012-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/hugetlb.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/mm/hugetlb.c~mm-hugetlb-avoid-unnecessary-hugetlb_acct_memory-call
+++ a/mm/hugetlb.c
@@ -3591,6 +3591,9 @@ static int hugetlb_acct_memory(struct hs
 {
 	int ret = -ENOMEM;
 
+	if (!delta)
+		return 0;
+
 	spin_lock(&hugetlb_lock);
 	/*
 	 * When cpuset is configured, it breaks the strict hugetlb page
_

Patches currently in -mm which might be from linmiaohe@huawei.com are

mm-memory_hotplug-use-helper-function-zone_end_pfn-to-get-end_pfn.patch
mm-mlock-stop-counting-mlocked-pages-when-none-vma-is-found.patch
mm-rmap-correct-some-obsolete-comments-of-anon_vma.patch
mm-rmap-remove-unneeded-semicolon-in-page_not_mapped.patch
mm-rmap-fix-obsolete-comment-in-__page_check_anon_rmap.patch
mm-rmap-use-page_not_mapped-in-try_to_unmap.patch
mm-rmap-correct-obsolete-comment-of-page_get_anon_vma.patch
mm-rmap-fix-potential-pte_unmap-on-an-not-mapped-pte.patch
mm-zsmallocc-convert-to-use-kmem_cache_zalloc-in-cache_alloc_zspage.patch
mm-zsmallocc-use-page_private-to-access-page-private.patch