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From: Vivek Goyal <vgoyal@redhat.com>
To: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <jaxboe@fusionio.com>,
	Mike Snitzer <snitzer@redhat.com>,
	"tytso@mit.edu" <tytso@mit.edu>,
	"djwong@us.ibm.com" <djwong@us.ibm.com>,
	"shli@kernel.org" <shli@kernel.org>,
	"neilb@suse.de" <neilb@suse.de>,
	"adilger.kernel@dilger.ca" <adilger.kernel@dilger.ca>,
	"jack@suse.cz" <jack@suse.cz>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"kmannth@us.ibm.com" <kmannth@us.ibm.com>,
	"cmm@us.ibm.com" <cmm@us.ibm.com>,
	"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
	"rwheeler@redhat.com" <rwheeler@redhat.com>,
	"hch@lst.de" <hch@lst.de>, "josef@redhat.com" <josef@redhat.com>,
	"jmoyer@redhat.com" <jmoyer@redhat.com>
Subject: Re: [PATCH v3 1/2] block: skip elevator data initialization for flush requests
Date: Fri, 4 Feb 2011 10:04:57 -0500	[thread overview]
Message-ID: <20110204150456.GD32190@redhat.com> (raw)
In-Reply-To: <20110203133820.GF2570@htj.dyndns.org>

On Thu, Feb 03, 2011 at 02:38:20PM +0100, Tejun Heo wrote:
> Hey, Jens.
> 
> On Thu, Feb 03, 2011 at 02:24:42PM +0100, Jens Axboe wrote:
> > On 2011-02-02 23:55, Mike Snitzer wrote:
> > > REQ_SORTED is not set for flush requests because they are never put on
> > > the IO scheduler.
> > 
> > That looks very wrong. REQ_SORTED gets set _when_ the request is sorted
> > into the IO scheduler. This is gross misuse, a bad hack.
> 
> 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.

Thanks
Vivek

  reply	other threads:[~2011-02-04 15:05 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-21 15:59 [PATCHSET] block: reimplement FLUSH/FUA to support merge Tejun Heo
2011-01-21 15:59 ` [PATCH 1/3] block: add REQ_FLUSH_SEQ Tejun Heo
2011-01-21 15:59 ` [PATCH 2/3] block: improve flush bio completion Tejun Heo
2011-01-21 15:59 ` [PATCH 3/3] block: reimplement FLUSH/FUA to support merge Tejun Heo
2011-01-21 18:56   ` Vivek Goyal
2011-01-21 19:19     ` Vivek Goyal
2011-01-23 10:25     ` Tejun Heo
2011-01-23 10:29       ` Tejun Heo
2011-01-24 20:31       ` Darrick J. Wong
2011-01-25 10:21         ` Tejun Heo
2011-01-25 11:39           ` Jens Axboe
2011-03-23 23:37             ` Darrick J. Wong
2011-01-25 22:56           ` Darrick J. Wong
2011-01-22  0:49   ` Mike Snitzer
2011-01-23 10:31     ` Tejun Heo
2011-01-25 20:46       ` Vivek Goyal
2011-01-25 21:04         ` Mike Snitzer
2011-01-23 10:48   ` [PATCH UPDATED " Tejun Heo
2011-01-25 20:41   ` [KNOWN BUGGY RFC PATCH 4/3] block: skip elevator initialization for flush requests Mike Snitzer
2011-01-25 21:55     ` Mike Snitzer
2011-01-26  5:27       ` [RFC PATCH 4/3] block: skip elevator initialization for flush requests -- was never BUGGY relative to upstream Mike Snitzer
2011-01-26 10:03     ` [KNOWN BUGGY RFC PATCH 4/3] block: skip elevator initialization for flush requests Tejun Heo
2011-01-26 10:05       ` Tejun Heo
2011-02-01 17:38       ` [RFC " Mike Snitzer
2011-02-01 18:52         ` Tejun Heo
2011-02-01 22:46           ` [PATCH v2 1/2] " Mike Snitzer
2011-02-02 21:51             ` Vivek Goyal
2011-02-02 22:06               ` Mike Snitzer
2011-02-02 22:55             ` [PATCH v3 1/2] block: skip elevator data " Mike Snitzer
2011-02-03  9:28               ` Tejun Heo
2011-02-03 14:48                 ` [PATCH v4 " Mike Snitzer
2011-02-03 13:24               ` [PATCH v3 " Jens Axboe
2011-02-03 13:38                 ` Tejun Heo
2011-02-04 15:04                   ` Vivek Goyal [this message]
2011-02-04 15:08                     ` Tejun Heo
2011-02-04 16:58                     ` [PATCH v5 " Mike Snitzer
2011-02-03 14:54                 ` [PATCH v3 " Mike Snitzer
2011-02-01 22:46           ` [PATCH v2 2/2] block: share request flush fields with elevator_private Mike Snitzer
2011-02-02 21:52             ` Vivek Goyal
2011-02-03  9:24             ` Tejun Heo
2011-02-11 10:08             ` Jens Axboe

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