From: "Pavel Begunkov (Silence)" <asml.silence@gmail.com>
To: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Pavel Begunkov <asml.silence@gmail.com>
Subject: [PATCH] io_uring: remove wait loop spurious wakeups
Date: Tue, 8 Oct 2019 02:18:42 +0300 [thread overview]
Message-ID: <936cd758d6c694fe1b8b9de050e24cfecdc2e60d.1570489620.git.asml.silence@gmail.com> (raw)
From: Pavel Begunkov <asml.silence@gmail.com>
Any changes interesting to tasks waiting in io_cqring_wait() are
commited with io_cqring_ev_posted(). However, io_ring_drop_ctx_refs()
also tries to do that but with no reason, that means spurious wakeups
every io_free_req() and io_uring_enter().
Just use percpu_ref_put() instead.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
fs/io_uring.c | 16 ++++------------
1 file changed, 4 insertions(+), 12 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index c934f91c51e9..89d77a626063 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -591,14 +591,6 @@ static void io_cqring_add_event(struct io_ring_ctx *ctx, u64 user_data,
io_cqring_ev_posted(ctx);
}
-static void io_ring_drop_ctx_refs(struct io_ring_ctx *ctx, unsigned refs)
-{
- percpu_ref_put_many(&ctx->refs, refs);
-
- if (waitqueue_active(&ctx->wait))
- wake_up(&ctx->wait);
-}
-
static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx,
struct io_submit_state *state)
{
@@ -646,7 +638,7 @@ static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx,
req->result = 0;
return req;
out:
- io_ring_drop_ctx_refs(ctx, 1);
+ percpu_ref_put(&ctx->refs);
return NULL;
}
@@ -654,7 +646,7 @@ static void io_free_req_many(struct io_ring_ctx *ctx, void **reqs, int *nr)
{
if (*nr) {
kmem_cache_free_bulk(req_cachep, *nr, reqs);
- io_ring_drop_ctx_refs(ctx, *nr);
+ percpu_ref_put_many(&ctx->refs, *nr);
*nr = 0;
}
}
@@ -663,7 +655,7 @@ static void __io_free_req(struct io_kiocb *req)
{
if (req->file && !(req->flags & REQ_F_FIXED_FILE))
fput(req->file);
- io_ring_drop_ctx_refs(req->ctx, 1);
+ percpu_ref_put(&req->ctx->refs);
kmem_cache_free(req_cachep, req);
}
@@ -3630,7 +3622,7 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
}
}
- io_ring_drop_ctx_refs(ctx, 1);
+ percpu_ref_put(&ctx->refs);
out_fput:
fdput(f);
return submitted ? submitted : ret;
--
2.23.0
next reply other threads:[~2019-10-07 23:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-07 23:18 Pavel Begunkov (Silence) [this message]
2019-10-08 3:16 ` [PATCH] io_uring: remove wait loop spurious wakeups Jens Axboe
2019-10-08 16:43 ` Pavel Begunkov
2019-10-08 17:00 ` Jens Axboe
2019-10-08 20:58 ` Pavel Begunkov
2019-10-08 21:22 ` Jens Axboe
2019-10-08 22:05 ` Pavel Begunkov
2019-10-09 2:54 ` Jens Axboe
2019-10-09 9:19 ` Pavel Begunkov
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