On Thu, 1 Feb 2018 09:51:02 -0700
Mathieu Poirier <mathieu.poir...@linaro.org> wrote:
> This is the follow-up patchset to  that attempt to fix a problem
> reported by Steve Rostedt  where DL bandwidth accounting is not
> recomputed after CPUset and CPU hotplug operations. When CPU hotplug and
> some CUPset manipulation take place root domains are destroyed and new ones
> created, loosing at the same time DL accounting information pertaining to
> utilisation. Please see  for a full description of the approach.
I do not know the cgroup / cpuset code too much, so I have no useful
comments on your patches... But I think this patchset is a nice
improvemnt respect to the current situation.
> A notable addition is patch 7/7 - it addresses a problem seen when hot
> plugging out a CPU where a DL task is running (see changelog for full
> details). The issue is unrelated to this patchset and will manifest
> itself on a mainline kernel.
I think I introduced this bug with my reclaiming patches, so I am
When a cpu is hot-plugged out, which code in the kernel is responsible
for migrating the tasks that are executing on such CPU? I was sure I
was handling all the relevant codepaths, but this bug clearly shows
that I was wrong.