diff options
| author | Pavel Begunkov <asml.silence@gmail.com> | 2022-03-17 05:03:40 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-03-17 05:26:32 +0300 |
| commit | 66fc25ca6b7ec4124606e0d59c71c6bcf14e05bb (patch) | |
| tree | 2fecf2834ba462bf61468b1b5799eebd7f210dc7 /fs/io_uring.c | |
| parent | 0f84747177b962c32243a57cb454193bdba4fe8d (diff) | |
| download | linux-66fc25ca6b7ec4124606e0d59c71c6bcf14e05bb.tar.xz | |
io_uring: shuffle io_eventfd_signal() bits around
A preparation patch, which moves a fast ->io_ev_fd check out of
io_eventfd_signal() into ev_posted*(). Compilers are smart enough for it
to not change anything, but will need it later.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/ec4091ac76d43912b73917e8db651c2dac4b7b01.1647481208.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 692dbe7b98e9..31c625f61fd8 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1828,10 +1828,6 @@ static void io_eventfd_signal(struct io_ring_ctx *ctx) { struct io_ev_fd *ev_fd; - /* Return quickly if ctx->io_ev_fd doesn't exist */ - if (likely(!rcu_dereference_raw(ctx->io_ev_fd))) - return; - rcu_read_lock(); /* * rcu_dereference ctx->io_ev_fd once and use it for both for checking @@ -1851,7 +1847,6 @@ static void io_eventfd_signal(struct io_ring_ctx *ctx) if (!ev_fd->eventfd_async || io_wq_current_is_worker()) eventfd_signal(ev_fd->cq_ev_fd, 1); - out: rcu_read_unlock(); } @@ -1863,7 +1858,7 @@ out: * 1:1 relationship between how many times this function is called (and * hence the eventfd count) and number of CQEs posted to the CQ ring. */ -static void io_cqring_ev_posted(struct io_ring_ctx *ctx) +static inline void io_cqring_ev_posted(struct io_ring_ctx *ctx) { /* * wake_up_all() may seem excessive, but io_wake_function() and @@ -1872,7 +1867,8 @@ static void io_cqring_ev_posted(struct io_ring_ctx *ctx) */ if (wq_has_sleeper(&ctx->cq_wait)) wake_up_all(&ctx->cq_wait); - io_eventfd_signal(ctx); + if (unlikely(rcu_dereference_raw(ctx->io_ev_fd))) + io_eventfd_signal(ctx); } static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) @@ -1881,7 +1877,8 @@ static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx) if (wq_has_sleeper(&ctx->cq_wait)) wake_up_all(&ctx->cq_wait); } - io_eventfd_signal(ctx); + if (unlikely(rcu_dereference_raw(ctx->io_ev_fd))) + io_eventfd_signal(ctx); } /* Returns true if there are no backlogged entries after the flush */ |