linux-kernel - Re: [PATCH RFC 10/14] block, bfq: add Early Queue Merge (EQM)

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Message-Id: <609A716A-F334-4A17-AA87-695CF789DFB2@linaro.org>
Date:   Wed, 15 Mar 2017 18:02:46 +0100
From:   Paolo Valente <paolo.valente@...aro.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Tejun Heo <tj@...nel.org>, Fabio Checconi <fchecconi@...il.com>,
        Arianna Avanzini <avanzini.arianna@...il.com>,
        linux-block@...r.kernel.org,
        Linux-Kernal <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>, broonie@...nel.org,
        Mauro Andreolini <mauro.andreolini@...more.it>
Subject: Re: [PATCH RFC 10/14] block, bfq: add Early Queue Merge (EQM)


> Il giorno 15 mar 2017, alle ore 17:56, Jens Axboe <axboe@...nel.dk> ha scritto:
> 
> On 03/04/2017 09:01 AM, Paolo Valente wrote:
>> @@ -6330,7 +7012,41 @@ static void bfq_rq_enqueued(struct bfq_data *bfqd, struct bfq_queue *bfqq,
>> 
>> static void __bfq_insert_request(struct bfq_data *bfqd, struct request *rq)
>> {
>> -	struct bfq_queue *bfqq = RQ_BFQQ(rq);
>> +	struct bfq_queue *bfqq = RQ_BFQQ(rq), *new_bfqq;
>> +
>> +	/*
>> +	 * An unplug may trigger a requeue of a request from the device
>> +	 * driver: make sure we are in process context while trying to
>> +	 * merge two bfq_queues.
>> +	 */
>> +	if (!in_interrupt()) {
> 
> What's the reason for this?

None :(

Just pre-existing, working code that I did not update, sorry.

> Don't use in_interrupt() to guide any of
> your decision making here.
> 

Of course, sorry for these silly mistakes.

Thanks,
Paolo

> -- 
> Jens Axboe
>