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From: Jens Axboe <jaxboe@fusionio.com>
To: Mike Snitzer <snitzer@redhat.com>
Cc: Tejun Heo <tj@kernel.org>, "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>,
	"vgoyal@redhat.com" <vgoyal@redhat.com>
Subject: Re: [PATCH v3 1/2] block: skip elevator data initialization for flush requests
Date: Thu, 3 Feb 2011 14:24:42 +0100	[thread overview]
Message-ID: <4D4AAC9A.4050407@fusionio.com> (raw)
In-Reply-To: <20110202225549.GA28109@redhat.com>

On 2011-02-02 23:55, Mike Snitzer wrote:
> Set REQ_SORTED, in the @rw_flags passed to the request allocator, for
> any request that may be put on IO scheduler.  Skip elevator data
> initialization during request allocation if REQ_SORTED is not set.
> 
> 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.

-- 
Jens Axboe


  parent reply	other threads:[~2011-02-03 13:24 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               ` Jens Axboe [this message]
2011-02-03 13:38                 ` [PATCH v3 " Tejun Heo
2011-02-04 15:04                   ` Vivek Goyal
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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