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authorJens Axboe <axboe@kernel.dk>2024-03-11 13:30:43 -0600
committerJens Axboe <axboe@kernel.dk>2024-03-11 15:02:59 -0600
commit6f0974eccbf78baead1735722c4f1ee3eb9422cd (patch)
tree3c9671fc62324bcbf0d6090747e14277b7a9ab31 /io_uring
parent045395d86acd02062b067bd325d4880391f2ce02 (diff)
io_uring: don't save/restore iowait state
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>
Diffstat (limited to 'io_uring')
-rw-r--r--io_uring/io_uring.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index cf348c33f485..49a124daa359 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2539,7 +2539,7 @@ 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;
@@ -2557,7 +2557,6 @@ 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;
@@ -2565,7 +2564,7 @@ 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;
}