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io_uring: optimise io_commit_cqring() 

In most cases io_commit_cqring() is just an smp_store_release(), and
it's hot enough, especially for IRQ rw, to want it to save on a function
call. Mark it inline and extract a non-inlined slow path doing drain
and timeout flushing. The inlined part is pretty slim to not cause
binary bloating.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/7350f8b6b92caa50a48a80be39909f0d83eddd93.1623772051.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-06-15 16:47:58 +01:00 committed by Jens Axboe
parent 3c19966d37
commit 2335f6f5dd
1 changed files with 11 additions and 7 deletions
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18
fs/io_uring.c
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@ -1344,14 +1344,18 @@ static void io_flush_timeouts(struct io_ring_ctx *ctx)
ctx->cq_last_tm_flush = seq;
}
static void io_commit_cqring(struct io_ring_ctx *ctx)
static void __io_commit_cqring_flush(struct io_ring_ctx *ctx)
{
if (unlikely(ctx->off_timeout_used || ctx->drain_active)) {
if (ctx->off_timeout_used)
io_flush_timeouts(ctx);
if (ctx->drain_active)
io_queue_deferred(ctx);
}
if (ctx->off_timeout_used)
io_flush_timeouts(ctx);
if (ctx->drain_active)
io_queue_deferred(ctx);
}
static inline void io_commit_cqring(struct io_ring_ctx *ctx)
{
if (unlikely(ctx->off_timeout_used || ctx->drain_active))
__io_commit_cqring_flush(ctx);
/* order cqe stores with ring update */
smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail);
}