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authorJens Axboe <axboe@kernel.dk>2019-12-07 21:06:46 -0700
committerJens Axboe <axboe@kernel.dk>2019-12-10 16:33:22 -0700
commite995d5123ed433e37a8d63ac528737c912592e3d (patch)
tree2e3608cdb19631f901bf40a92adc5e74934cdaf8 /fs/io-wq.h
parent506d95ff5d6aa0a099a116c49d3884e29801d843 (diff)
downloadlinux-sh-e995d5123ed433e37a8d63ac528737c912592e3d.tar.gz
io-wq: briefly spin for new work after finishing work
To avoid going to sleep only to get woken shortly thereafter, spin briefly for new work upon completion of work. Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io-wq.h')
-rw-r--r--fs/io-wq.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/io-wq.h b/fs/io-wq.h
index 7c333a28e2a7..fb993b2bd0ef 100644
--- a/fs/io-wq.h
+++ b/fs/io-wq.h
@@ -35,7 +35,8 @@ static inline void wq_list_add_tail(struct io_wq_work_node *node,
struct io_wq_work_list *list)
{
if (!list->first) {
- list->first = list->last = node;
+ list->last = node;
+ WRITE_ONCE(list->first, node);
} else {
list->last->next = node;
list->last = node;
@@ -47,7 +48,7 @@ static inline void wq_node_del(struct io_wq_work_list *list,
struct io_wq_work_node *prev)
{
if (node == list->first)
- list->first = node->next;
+ WRITE_ONCE(list->first, node->next);
if (node == list->last)
list->last = prev;
if (prev)
@@ -58,7 +59,7 @@ static inline void wq_node_del(struct io_wq_work_list *list,
#define wq_list_for_each(pos, prv, head) \
for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)
-#define wq_list_empty(list) ((list)->first == NULL)
+#define wq_list_empty(list) (READ_ONCE((list)->first) == NULL)
#define INIT_WQ_LIST(list) do { \
(list)->first = NULL; \
(list)->last = NULL; \