Re: [PATCH v3 1/2] block: skip elevator data initialization for flush requests
From: Tejun Heo <tj@kernel.org>
Date: 2011-02-03 13:38:28
Also in:
lkml
From: Tejun Heo <tj@kernel.org>
Date: 2011-02-03 13:38:28
Also in:
lkml
Hey, Jens. On Thu, Feb 03, 2011 at 02:24:42PM +0100, Jens Axboe wrote:
On 2011-02-02 23:55, Mike Snitzer wrote:quoted
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