linux-kernel - [PATCH 0/2] Fix broken cpuset affinity handling on heterogeneous systems

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Date:   Tue, 31 Jan 2023 22:17:17 +0000
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Waiman Long <longman@...hat.com>,
        Zefan Li <lizefan.x@...edance.com>, Tejun Heo <tj@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org
Subject: [PATCH 0/2] Fix broken cpuset affinity handling on heterogeneous systems

Hi folks,

These two patches fix a couple of CPU affinity issues involving cpusets
on heterogeneous systems. A concrete example of this is running 32-bit
tasks on recent arm64 SoCs, where some of the cores are only capable of
64-bit execution.

The first patch (from Peter) fixes a regression introduced during the
recent merge window which is causing test failures in Android where the
problematic patches have been backported. The second patch fixes a
longer-standing issue, which I noticed while testing fixes for the
initial regression.

Ideally, both of these would land together, but fixing the regression
for 6.2 is my main concern.

Anyway, I don't think either Peter or I would call ourselves cpuset
experts (far from it!), so please have a look.

Cheers,

Will

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Waiman Long <longman@...hat.com>
Cc: Zefan Li <lizefan.x@...edance.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: cgroups@...r.kernel.org

--->8

Peter Zijlstra (1):
  cpuset: Fix cpuset_cpus_allowed() to not filter offline CPUs

Will Deacon (1):
  cpuset: Call set_cpus_allowed_ptr() with appropriate mask for task

 kernel/cgroup/cpuset.c | 57 +++++++++++++++++++++++++++++++++---------
 1 file changed, 45 insertions(+), 12 deletions(-)

-- 
2.39.1.456.gfc5497dd1b-goog