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| author | Miaohe Lin <linmiaohe@huawei.com> | 2021-05-04 18:33:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-05-05 11:27:20 -0700 |
| commit | d4241a049ac0049fe96b3dae0598092517dbf6bd (patch) | |
| tree | 17a9a6758bcb4f3cc25e1b31712a548c8bcfc7bc /fs | |
| parent | d83e6c8a9b65876b0dcd11ca25e8c39bd7bb1a1c (diff) | |
| download | lwn-d4241a049ac0049fe96b3dae0598092517dbf6bd.tar.gz lwn-d4241a049ac0049fe96b3dae0598092517dbf6bd.zip | |
mm/hugetlb: avoid calculating fault_mutex_hash in truncate_op case
The fault_mutex hashing overhead can be avoided in truncate_op case
because page faults can not race with truncation in this routine.
So calculate hash for fault_mutex only in !truncate_op case to save some
cpu cycles.
Link: https://lkml.kernel.org/r/20210308112809.26107-6-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/hugetlbfs/inode.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index c262566f7c5d..d81f52b87bd7 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -482,10 +482,9 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart, for (i = 0; i < pagevec_count(&pvec); ++i) { struct page *page = pvec.pages[i]; - u32 hash; + u32 hash = 0; index = page->index; - hash = hugetlb_fault_mutex_hash(mapping, index); if (!truncate_op) { /* * Only need to hold the fault mutex in the @@ -493,6 +492,7 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart, * page faults. Races are not possible in the * case of truncation. */ + hash = hugetlb_fault_mutex_hash(mapping, index); mutex_lock(&hugetlb_fault_mutex_table[hash]); } |