lkml.org 
[lkml]   [2011]   [Mar]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 07/10] fs: make generic file read/write functions plug
On Fri, Mar 04, 2011 at 02:22:21PM +0100, Jens Axboe wrote:
> Good catch, we need to modify that logic. If the task is currently
> plugged, it should not dispatch until blk_finish_plug() is called.
> Essentially SYNC will not control dispatch. Will allow us to clean up
> that logic, too.

<broken-record-mode>

Time to use the opportunity to sort out what the various bio/request
flags mean.

REQ_UNPLUG should simply go away with the explicit stack plugging.
What's left for REQ_SYNC? It'll control if the request goes into the
sync bucket and some cfq tweaks. We should clearly document what it
does.

REQ_META? Maybe we should finally agree what it does and decide if it
should be used consistenly. Especially the priority over REQ_SYNC in
cfq still looks somewhat odd, as does the totally inconsequent use.

</broken-record-mode>


\
 
 \ /
  Last update: 2011-03-06 12:29    [W:0.216 / U:0.612 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site