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io_uring: don't submit sqes when ctx->refs is dying
When IORING_SETUP_SQPOLL is enabled, io_ring_ctx_wait_and_kill() will wait for sq thread to idle by busy loop: while (ctx->sqo_thread && !wq_has_sleeper(&ctx->sqo_wait)) cond_resched(); Above loop isn't very CPU friendly, it may introduce a short cpu burst on the current cpu. If ctx->refs is dying, we forbid sq_thread from submitting any further SQEs. Instead they just get discarded when we exit. Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -6175,7 +6175,8 @@ static int io_sq_thread(void *data)
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}
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mutex_lock(&ctx->uring_lock);
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ret = io_submit_sqes(ctx, to_submit, NULL, -1);
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if (likely(!percpu_ref_is_dying(&ctx->refs)))
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ret = io_submit_sqes(ctx, to_submit, NULL, -1);
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mutex_unlock(&ctx->uring_lock);
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timeout = jiffies + ctx->sq_thread_idle;
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}
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@ -7465,16 +7466,6 @@ static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
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percpu_ref_kill(&ctx->refs);
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mutex_unlock(&ctx->uring_lock);
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/*
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* Wait for sq thread to idle, if we have one. It won't spin on new
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* work after we've killed the ctx ref above. This is important to do
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* before we cancel existing commands, as the thread could otherwise
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* be queueing new work post that. If that's work we need to cancel,
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* it could cause shutdown to hang.
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*/
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while (ctx->sqo_thread && !wq_has_sleeper(&ctx->sqo_wait))
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cond_resched();
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io_kill_timeouts(ctx);
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io_poll_remove_all(ctx);
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