From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>,
[email protected], [email protected]
Subject: [PATCH 2/2] io_uring: don't trigger timeout with another t-out
Date: Sat, 18 Apr 2020 20:20:11 +0300 [thread overview]
Message-ID: <bcbbaa59d9edd2174c6d6a5303f76dba191b00c8.1587229607.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
When deciding whether to fire a timeout basing on number of completions,
ignore CQEs emitted by other timeouts.
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 19 +++----------------
1 file changed, 3 insertions(+), 16 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index c34c5dcc90fc..d72f82c09ce3 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1098,33 +1098,20 @@ static void io_kill_timeouts(struct io_ring_ctx *ctx)
spin_unlock_irq(&ctx->completion_lock);
}
-static inline bool io_check_in_range(u32 pos, u32 start, u32 end)
-{
- /* if @end < @start, check for [end, MAX_UINT] + [MAX_UINT, start] */
- return (pos - start) <= (end - start);
-}
-
static void __io_flush_timeouts(struct io_ring_ctx *ctx)
{
- u32 end, start;
-
- start = end = ctx->cached_cq_tail;
do {
struct io_kiocb *req = list_first_entry(&ctx->timeout_list,
struct io_kiocb, list);
if (req->flags & REQ_F_TIMEOUT_NOSEQ)
break;
- /*
- * multiple timeouts may have the same target,
- * check that @req is in [first_tail, cur_tail]
- */
- if (!io_check_in_range(req->timeout.target_cq, start, end))
+ if (req->timeout.target_cq != ctx->cached_cq_tail
+ - atomic_read(&ctx->cq_timeouts))
break;
list_del_init(&req->list);
io_kill_timeout(req);
- end = ctx->cached_cq_tail;
} while (!list_empty(&ctx->timeout_list));
}
@@ -4688,7 +4675,7 @@ static int io_timeout(struct io_kiocb *req)
goto add;
}
- tail = ctx->cached_cq_tail;
+ tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts);
req->timeout.target_cq = tail + off;
/*
--
2.24.0
prev parent reply other threads:[~2020-04-18 17:21 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-18 17:20 [PATCH 0/2] CQ vs SQ timeout accounting Pavel Begunkov
2020-04-18 17:20 ` [PATCH 1/2] io_uring: trigger timeout after any sqe->off CQEs Pavel Begunkov
2020-04-20 19:40 ` Jens Axboe
2020-04-20 20:12 ` Pavel Begunkov
2020-04-20 20:15 ` Pavel Begunkov
2020-04-22 22:20 ` Pavel Begunkov
2020-04-22 22:23 ` Jens Axboe
2020-04-22 22:51 ` Pavel Begunkov
2020-04-18 17:20 ` Pavel Begunkov [this message]
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