From: Pavel Begunkov Date: Sun, 16 May 2021 21:58:01 +0000 (+0100) Subject: io_uring: improve sq_thread waiting check X-Git-Tag: accepted/tizen/unified/20230118.172025~6938^2~81 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=aaa9f0f48172b190a835792abe63f8859372eeec;p=platform%2Fkernel%2Flinux-rpi.git io_uring: improve sq_thread waiting check 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 Link: https://lore.kernel.org/r/1ee5a696d9fd08645994c58ee147d149a8957d94.1621201931.git.asml.silence@gmail.com Signed-off-by: Jens Axboe --- diff --git a/fs/io_uring.c b/fs/io_uring.c index 24c0042..85d0184c 100644 --- 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;