Messages in this thread | | | From | Valentin Schneider <> | Subject | Re: [PATCH v8 07/19] cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() | Date | Fri, 04 Jun 2021 18:11:20 +0100 |
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On 02/06/21 17:47, Will Deacon wrote: > Asymmetric systems may not offer the same level of userspace ISA support > across all CPUs, meaning that some applications cannot be executed by > some CPUs. As a concrete example, upcoming arm64 big.LITTLE designs do > not feature support for 32-bit applications on both clusters. > > Modify guarantee_online_cpus() to take task_cpu_possible_mask() into > account when trying to find a suitable set of online CPUs for a given > task. This will avoid passing an invalid mask to set_cpus_allowed_ptr() > during ->attach() and will subsequently allow the cpuset hierarchy to be > taken into account when forcefully overriding the affinity mask for a > task which requires migration to a compatible CPU. > > Cc: Li Zefan <lizefan@huawei.com> > Cc: Tejun Heo <tj@kernel.org> > Cc: Johannes Weiner <hannes@cmpxchg.org> > Signed-off-by: Will Deacon <will@kernel.org>
Reviewed-by: Valentin Schneider <Valentin.Schneider@arm.com>
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