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io_uring: briefly loose locks while reaping events

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It's not nice to hold @uring_lock for too long io_iopoll_reap_events().
For instance, the lock is needed to publish requests to @poll_list, and
that locks out tasks doing that for no good reason. Loose it
occasionally.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-07-06 17:59:31 +03:00 committed by Jens Axboe
parent eba0a4dd2a
commit 3fcee5a6d5
1 changed files with 6 additions and 1 deletions
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7
fs/io_uring.c
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@ -2069,8 +2069,13 @@ static void io_iopoll_reap_events(struct io_ring_ctx *ctx)
/*
* Ensure we allow local-to-the-cpu processing to take place,
* in this case we need to ensure that we reap all events.
* Also let task_work, etc. to progress by releasing the mutex
*/
cond_resched();
if (need_resched()) {
mutex_unlock(&ctx->uring_lock);
cond_resched();
mutex_lock(&ctx->uring_lock);
}
}
mutex_unlock(&ctx->uring_lock);
}