lkml.org 
[lkml]   [2020]   [May]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH block/for-linus] iocost: don't let vrate run wild while there's no saturation signal
On Mon, Oct 14, 2019 at 05:18:11PM -0700, Tejun Heo wrote:
> When the QoS targets are met and nothing is being throttled, there's
> no way to tell how saturated the underlying device is - it could be
> almost entirely idle, at the cusp of saturation or anywhere inbetween.
> Given that there's no information, it's best to keep vrate as-is in
> this state. Before 7cd806a9a953 ("iocost: improve nr_lagging
> handling"), this was the case - if the device isn't missing QoS
> targets and nothing is being throttled, busy_level was reset to zero.
...
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Reported-by: Andy Newell <newella@fb.com>
> Fixes: 7cd806a9a953 ("iocost: improve nr_lagging handling")

Jens, this one fell through the cracks. It still applies with only a small
offset. Can you please apply?

Thanks.

--
tejun

\
 
 \ /
  Last update: 2020-05-14 16:52    [W:0.270 / U:0.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site