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mm/hugetlb: avoid unnecessary hugetlb_acct_memory() call

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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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2021-02-24 12:06:57 -08:00 committed by Linus Torvalds
parent a1ba9da8f0
commit 0aa7f3544a
1 changed files with 3 additions and 0 deletions
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3
mm/hugetlb.c
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@ -3591,6 +3591,9 @@ static int hugetlb_acct_memory(struct hstate *h, long delta)
{
int ret = -ENOMEM;
if (!delta)
return 0;
spin_lock(&hugetlb_lock);
/*
* When cpuset is configured, it breaks the strict hugetlb page