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Date: Thu, 3 Feb 2011 14:38:20 +0100 From: Tejun Heo <tj@...nel.org> To: Jens Axboe <jaxboe@...ionio.com> Cc: 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>, "vgoyal@...hat.com" <vgoyal@...hat.com> Subject: Re: [PATCH v3 1/2] block: skip elevator data initialization for flush requests 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? Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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