linux-kernel - Re: [PATCH] cfq: get rid of cfqq hash

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Message-ID: <20070425065822.GG9715@kernel.dk>
Date:	Wed, 25 Apr 2007 08:58:22 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Vasily Tarasov <vtaras@...nvz.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, OVZDL <devel@...nvz.org>
Subject: Re: [PATCH] cfq: get rid of cfqq hash

On Tue, Apr 24 2007, Vasily Tarasov wrote:
> @@ -1806,7 +1765,11 @@ static int cfq_may_queue(request_queue_t
>  	 * so just lookup a possibly existing queue, or return 'may queue'
>  	 * if that fails
>  	 */
> -	cfqq = cfq_find_cfq_hash(cfqd, key, tsk->ioprio);
> +	cic = cfq_get_io_context_noalloc(cfqd, tsk);
> +	if (!cic)
> +		return ELV_MQUEUE_MAY; 
> +
> +	cfqq = cic->cfqq[rw & REQ_RW_SYNC];
>  	if (cfqq) {
>  		cfq_init_prio_data(cfqq);
>  		cfq_prio_boost(cfqq);

Ahem, how well did you test this patch?

-- 
Jens Axboe

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