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io_uring: improve sq_thread waiting check
author
Pavel Begunkov
<asml.silence@gmail.com>
Sun, 16 May 2021 21:58:01 +0000
(22:58 +0100)
committer
Jens Axboe
<axboe@kernel.dk>
Mon, 14 Jun 2021 14:23:04 +0000
(08:23 -0600)
If SQPOLL task finds a ring requesting it to continue running, no need
to set wake flag to rest of the rings as it will be cleared in a moment
anyway, so hide it in a single sqd->ctx_list loop.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link:
https://lore.kernel.org/r/1ee5a696d9fd08645994c58ee147d149a8957d94.1621201931.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
fs/io_uring.c
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diff --git
a/fs/io_uring.c
b/fs/io_uring.c
index
24c0042
..
85d0184
100644
(file)
--- a/
fs/io_uring.c
+++ b/
fs/io_uring.c
@@
-6894,11
+6894,10
@@
static int io_sq_thread(void *data)
prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE);
if (!io_sqd_events_pending(sqd)) {
- list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
- io_ring_set_wakeup_flag(ctx);
-
needs_sched = true;
list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) {
+ io_ring_set_wakeup_flag(ctx);
+
if ((ctx->flags & IORING_SETUP_IOPOLL) &&
!list_empty_careful(&ctx->iopoll_list)) {
needs_sched = false;