linux-kernel - Re: [PATCH] blk-wbt: get back the missed wakeup from __wbt

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Date:   Fri, 24 Aug 2018 11:17:13 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Eduardo Valentin <eduval@...zon.com>
Cc:     "jianchao.wang" <jianchao.w.wang@...cle.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Anchal Agarwal <anchalag@...zon.com>,
        Frank van der Linden <fllinden@...zon.com>
Subject: Re: [PATCH] blk-wbt: get back the missed wakeup from __wbt_done

On 8/24/18 11:14 AM, Eduardo Valentin wrote:
>> +	if (lock) {
>> +		spin_unlock_irq(lock);
>> +		io_schedule();
>> +		spin_lock_irq(lock);
>> +	} else
>> +		io_schedule();
> 
> Nitpick but, shouldn't this look like:
> 
> +	if (lock) {
> +		spin_unlock_irq(lock);
> +		io_schedule();
> +		spin_lock_irq(lock);
> +	} else {
> +		io_schedule();
> +	}

Depends on who you ask... I prefer the former.

> And another random though, it would be good to have some sort of
> tracing of this.

wbt does have tracing, but we've never had tracing on the sleep/wakeup
parts. But that's pretty much completely orthogonal to the issue, that
should be done as a separate patch, if useful.

BTW, I've now tested this and it seems to work fine for me.

-- 
Jens Axboe