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| author | Jens Axboe <axboe@kernel.dk> | 2024-03-11 13:30:43 -0600 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2024-03-26 18:20:07 -0400 |
| commit | e627c433c83d543d75e06fa72021f7a401c4992f (patch) | |
| tree | af60b3015038c4cf47e28086ce5b2fdce4ae53dc /io_uring | |
| parent | 2584d6bbc2bca1819059907990fcbec8228b2090 (diff) | |
| download | linux-e627c433c83d543d75e06fa72021f7a401c4992f.tar.gz linux-e627c433c83d543d75e06fa72021f7a401c4992f.tar.bz2 linux-e627c433c83d543d75e06fa72021f7a401c4992f.zip | |
io_uring: don't save/restore iowait state
[ Upstream commit 6f0974eccbf78baead1735722c4f1ee3eb9422cd ]
This kind of state is per-syscall, and since we're doing the waiting off
entering the io_uring_enter(2) syscall, there's no way that iowait can
already be set for this case. Simplify it by setting it if we need to,
and always clearing it to 0 when done.
Fixes: 7b72d661f1f2 ("io_uring: gate iowait schedule on having pending requests")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/io_uring.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 049a163d0fdd..25e289332034 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -2501,7 +2501,7 @@ static bool current_pending_io(void) static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, struct io_wait_queue *iowq) { - int io_wait, ret; + int ret; if (unlikely(READ_ONCE(ctx->check_cq))) return 1; @@ -2519,7 +2519,6 @@ static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, * can take into account that the task is waiting for IO - turns out * to be important for low QD IO. */ - io_wait = current->in_iowait; if (current_pending_io()) current->in_iowait = 1; ret = 0; @@ -2527,7 +2526,7 @@ static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx, schedule(); else if (!schedule_hrtimeout(&iowq->timeout, HRTIMER_MODE_ABS)) ret = -ETIME; - current->in_iowait = io_wait; + current->in_iowait = 0; return ret; } |