linux-kernel - Re: [PATCH] block: simplify I/O stat accounting

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Date:	Thu, 16 Apr 2009 18:34:57 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Jerome Marchand <jmarchan@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: simplify I/O stat accounting

On Thu, Apr 16 2009, Jerome Marchand wrote:
> 
> This simplifies I/O stat accounting switching code and separates it
> completely from I/O scheduler switch code.
> 
> Requests are accounted according to the state of their request queue
> at the time of the request allocation. There is no need anymore to
> flush the request queue when switching I/O accounting state.

This is cleaner, I like it. I'll apply it, but I'm changing this one:

> @@ -792,9 +792,10 @@ static struct request *get_request(struct
> request_queue *q, int rw_flags,
>  	if (priv)
>  		rl->elvpriv++;
> 
> +	iostat = blk_queue_io_stat(q) ? REQ_IO_STAT : 0;
>  	spin_unlock_irq(q->queue_lock);

to a regular if, I hate these ?: constructs. An if is much more
readable, imho.

-- 
Jens Axboe

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