lkml.org 
[lkml]   [2023]   [Jan]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v9 3/8] cpuset: Rebuild root domain deadline accounting information
On 12/20/22 11:43, Qais Yousef wrote:
> On 12/19/22 09:07, Vincent Guittot wrote:
> > On Sat, 17 Dec 2022 at 00:35, Qais Yousef <qyousef@layalina.io> wrote:
> > >
> > > Hi
> > >
> > > On 07/19/19 15:59, Juri Lelli wrote:
> > > > When the topology of root domains is modified by CPUset or CPUhotplug
> > > > operations information about the current deadline bandwidth held in the
> > > > root domain is lost.
> > > >
> > > > This patch addresses the issue by recalculating the lost deadline
> > > > bandwidth information by circling through the deadline tasks held in
> > > > CPUsets and adding their current load to the root domain they are
> > > > associated with.
> > > >
> > > > Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> > > > Signed-off-by: Juri Lelli <juri.lelli@redhat.com>
> > > > ---
> > >
> > > We see that rebuild_root_domain() can take 10+ ms (I get a max of 20ms quite
> > > consistently) on suspend/resume.
> > >
> > > Do we actually need to rebuild_root_domain() if we're going through
> > > a suspend/resume cycle?
> >
> > During suspend to ram, there are cpus hotplug operation but If you use
> > suspend to idle, you will skip cpus hotplug operation and its
> > associated rebuild.
>
> Thanks Vincent. I'll check on that - but if we want to keep suspend to ram?
> Do we really to incur this hit?

Using s2idle is not an option actually. I'll prepare v2 to address Waiman
comment if I don't get more feedback in the next few days.


Thanks!

--
Qais Yousef

\
 
 \ /
  Last update: 2023-03-26 23:42    [W:0.053 / U:0.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site