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io_uring: remove extra in_idle wake up 

io_dismantle_req() is always followed by io_put_task(), which already do
proper in_idle wake ups, so we can skip waking the owner task in
io_dismantle_req(). The rules are simpler now, do io_put_task() shortly
after ending a request, and it will be fine.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-03-01 18:20:48 +00:00 committed by Jens Axboe
parent ebf9366707
commit b23fcf477f
1 changed files with 1 additions and 3 deletions
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4
fs/io_uring.c
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@ -1649,18 +1649,16 @@ static void io_dismantle_req(struct io_kiocb *req)
if (req->flags & REQ_F_INFLIGHT) {
struct io_ring_ctx *ctx = req->ctx;
struct io_uring_task *tctx = req->task->io_uring;
unsigned long flags;
spin_lock_irqsave(&ctx->inflight_lock, flags);
list_del(&req->inflight_entry);
spin_unlock_irqrestore(&ctx->inflight_lock, flags);
req->flags &= ~REQ_F_INFLIGHT;
if (atomic_read(&tctx->in_idle))
wake_up(&tctx->wait);
}
}
/* must to be called somewhat shortly after putting a request */
static inline void io_put_task(struct task_struct *task, int nr)
{
struct io_uring_task *tctx = task->io_uring;