linux-kernel - Re: [PATCH v3 1/2] block: skip elevator data initialization for flush requests

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Message-ID: <20110204150826.GJ12133@htj.dyndns.org>
Date:	Fri, 4 Feb 2011 16:08:46 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Jens Axboe <jaxboe@...ionio.com>,
	Mike Snitzer <snitzer@...hat.com>,
	"tytso@....edu" <tytso@....edu>,
	"djwong@...ibm.com" <djwong@...ibm.com>,
	"shli@...nel.org" <shli@...nel.org>,
	"neilb@...e.de" <neilb@...e.de>,
	"adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
	"jack@...e.cz" <jack@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kmannth@...ibm.com" <kmannth@...ibm.com>,
	"cmm@...ibm.com" <cmm@...ibm.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"rwheeler@...hat.com" <rwheeler@...hat.com>,
	"hch@....de" <hch@....de>, "josef@...hat.com" <josef@...hat.com>,
	"jmoyer@...hat.com" <jmoyer@...hat.com>
Subject: Re: [PATCH v3 1/2] block: skip elevator data initialization for
 flush requests

Hello,

On Fri, Feb 04, 2011 at 10:04:57AM -0500, Vivek Goyal wrote:
> > The rationale behind suggesting was that it indicates to the allocator
> > that the request may be sorted as how the request will be used is
> > communicated using @rw_flags to the allocator.  The patch is buggy
> > that the flag actually ends up on the request.  Any better idea how to
> > communicate it?
> 
> Though you did not like the V1 of patch, personally I also liked just parsing
> FLUSH or FUA flag in get_request().
> 
> Or how about intoducing a helper function blk_rq_should_init_elevator() 
> or something like that and this function will parse FLUSH, FUA flags.

I suppose it's Jens' call, but if the FLUSH/FUA testing goes inside
the alloc function, please decorate with big fat comment and mention
it in the comment for the union definition too.

Thank you.

-- 
tejun
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