tree fb73c8cd8bc992da346a032268e9203c31056b02
parent 18ae0b471b9a0c4a95b5e17144d79d47edfea0fb
author Yoshiki Iguchi <yoshiki@chromium.org> 1585807515 +0000
committer LaMont Jones <lamontjones@chromium.org> 1585850162 +0000

Revert "init: Mount cpuset in v2 mode if possible"

This reverts commit 0614530defbccd7b048aa53c9c704c84641fd94e.

Reason for revert: This is a possible cause of b/153026763.

Original change's description:
> init: Mount cpuset in v2 mode if possible
> 
> On systems with cpuset_v2_mode, we should use it to get cgroup v2 cpuset
> behavior in cgroup v1 so that the kernel does not need cpuset hotplug
> fixes to v1 and makes backporting efforts much less of ancient kernel
> patches (both in terms of forgetting to backport, and backporting
> incorrectly).
> 
> The difference between v1 vs v2 is:
> 1. Offlining all cpus in a set don't migrate tasks in v1.
> 2. Offlining and onlining cpus restores CPUs in v2.
> 3. Differences in behavior of having child be subset of parent's CPUs.
> 
> For ChromeOS, we want the behavior in #2. #1 and #3. don't effect us. We
> can make v1 cpusets behave like v2 with the cpuset_v2_mode mount option
> which fixes the hotplug issue.
> 
> BUG=b:152062524
> TEST=Boot with both types of systems and verify cpuset mount.
> 
> Change-Id: I5ace34766c7d117051f069ed6a01ff5f2b180dea
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2122436
> Tested-by: Joel Fernandes <joelaf@google.com>
> Tested-by: Sonny Rao <sonnyrao@chromium.org>
> Auto-Submit: Joel Fernandes <joelaf@google.com>
> Reviewed-by: Mike Frysinger <vapier@chromium.org>
> Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
> Commit-Queue: Sonny Rao <sonnyrao@chromium.org>

Bug: b:152062524
Bug: b:153026763
Change-Id: Ic959d9e71fb432eaf2b2264e5669b29ef8e8d0db
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2133509
Commit-Queue: Sonny Rao <sonnyrao@chromium.org>
Tested-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Auto-Submit: Yoshiki Iguchi <yoshiki@chromium.org>