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

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Date:	Thu, 16 Apr 2009 18:42:54 +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, Jens Axboe wrote:
> On Thu, Apr 16 2009, Jens Axboe wrote:
> > On Thu, Apr 16 2009, Jens Axboe wrote:
> > > 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.
> > 
> > Grmbl, your patch is line wrapped. Please fix your mailer.
> 
> And it doesn't apply to current -git. Looks like a hand apply, but
> please be a little more careful in the future.

OK, it doesn't even compile either:

+#define blk_rq_io_stat(rq)     ((rq)->flags & REQ_IO_STAT)

that wants to be ->cmd_flags.

Please resend when you have something that at least compiles. If you
send untested stuff my way, at least tell me.

-- 
Jens Axboe

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