Re: [PATCH 7/9] io-wq: implement fixed worker logic

[Hao Xu]

On 4/30/22 21:27, Jens Axboe wrote:
> On 4/29/22 4:18 AM, Hao Xu wrote:
> > @@ -1030,6 +1101,7 @@ static bool io_wq_work_match_item(struct io_wq_work *work, void *data)
> >   static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work)
> >   {
> >   	struct io_wqe_acct *acct = io_work_get_acct(wqe, work);
> > +	struct io_wqe_acct *fixed_acct;
> >   	struct io_cb_cancel_data match;
> >   	unsigned work_flags = work->flags;
> >   	bool do_create;
> > @@ -1044,8 +1116,14 @@ static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work)
> >   		return;
> >   	}
> >   
> > +	fixed_acct = io_get_acct(wqe, !acct->index, true);
> > +	if (fixed_acct->fixed_worker_registered && !io_wq_is_hashed(work)) {
> > +		if (io_wqe_insert_private_work(wqe, work, fixed_acct))
> > +			return;
> > +	}
> > +
>
> As per previous email, I was going to comment back saying "why don't we
> just always do hashed work on the non-fixed workers?" - but that's
> already what you are doing. Isn't this fine, does anything else need to
> get done here in terms of hashed work and fixed workers? If you need
> per-iowq serialization, then you don't get a fixed worker.

Hmm, seems we cannot accelerate serialized works with fixed worker. So
Let's make it as it is.
>