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authorWei Yang <richardw.yang@linux.intel.com>2020-01-31 09:14:35 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-01-31 21:30:39 +0300
commitafb971729a0bca7676606013e913025bc5619301 (patch)
treed625d921deb159a523da36eb14abd0d7f0012fd4 /mm
parenta8803e6c177f490fe5624397b07f4eb05a15f532 (diff)
downloadlinux-afb971729a0bca7676606013e913025bc5619301.tar.xz
mm/huge_memory.c: reduce critical section protected by split_queue_lock
split_queue_lock protects data in struct deferred_split. We can release the lock after delete the page from deferred_split_queue. This patch moves the THP accounting out of the lock protection, which is introduced in commit 65c453778aea ("mm, rmap: account shmem thp pages"). Link: http://lkml.kernel.org/r/20200110025516.23996-1-richardw.yang@linux.intel.com Signed-off-by: Wei Yang <richardw.yang@linux.intel.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/huge_memory.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 4439e91f8443..5b2876942639 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2799,6 +2799,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
ds_queue->split_queue_len--;
list_del(page_deferred_list(head));
}
+ spin_unlock(&ds_queue->split_queue_lock);
if (mapping) {
if (PageSwapBacked(head))
__dec_node_page_state(head, NR_SHMEM_THPS);
@@ -2806,7 +2807,6 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
__dec_node_page_state(head, NR_FILE_THPS);
}
- spin_unlock(&ds_queue->split_queue_lock);
__split_huge_page(page, list, end, flags);
if (PageSwapCache(head)) {
swp_entry_t entry = { .val = page_private(head) };