Re: [PATCH v9 08/20] cpuset: Cleanup cpuset_cpus_allowed_fallback() use in... | linux-arm-kernel

[PATCH v9 00/20] Add support for 32-bit tasks on asymmetric AArch32 systems · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 01/20] arm64: cpuinfo: Split AArch32 registers out into a separate struct · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 02/20] arm64: Allow mismatched 32-bit EL0 support · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 03/20] KVM: arm64: Kill 32-bit vCPUs on systems with mismatched EL0 support · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 04/20] arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 05/20] sched: Introduce task_cpu_possible_mask() to limit fallback rq selection · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 06/20] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 · Will Deacon <will@kernel.org> · 2021-06-08
Re: [PATCH v9 06/20] cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1 · Valentin Schneider <hidden> · 2021-06-10
[PATCH v9 07/20] cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus() · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 08/20] cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq() · Will Deacon <will@kernel.org> · 2021-06-08
Re: [PATCH v9 08/20] cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq() · Valentin Schneider <hidden> · 2021-06-10
[PATCH v9 09/20] sched: Reject CPU affinity changes based on task_cpu_possible_mask() · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 10/20] sched: Introduce task_struct::user_cpus_ptr to track requested affinity · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 11/20] sched: Split the guts of sched_setaffinity() into a helper function · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 12/20] sched: Allow task CPU affinity to be restricted on asymmetric systems · Will Deacon <will@kernel.org> · 2021-06-08
Re: [PATCH v9 12/20] sched: Allow task CPU affinity to be restricted on asymmetric systems · Valentin Schneider <hidden> · 2021-06-10
[PATCH v9 13/20] sched: Introduce dl_task_check_affinity() to check proposed affinity · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 14/20] arm64: Implement task_cpu_possible_mask() · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 15/20] arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0 · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 16/20] arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 17/20] arm64: Advertise CPUs capable of running 32-bit applications in sysfs · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 18/20] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 19/20] arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores · Will Deacon <will@kernel.org> · 2021-06-08
[PATCH v9 20/20] Documentation: arm64: describe asymmetric 32-bit support · Will Deacon <will@kernel.org> · 2021-06-08
Re: [PATCH v9 00/20] Add support for 32-bit tasks on asymmetric AArch32 systems · Will Deacon <will@kernel.org> · 2021-06-11

Re: [PATCH v9 08/20] cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq()

From: Valentin Schneider <hidden>
Date: 2021-06-10 13:00:04
Also in: linux-arch, lkml

On 08/06/21 19:03, Will Deacon wrote:

select_fallback_rq() only needs to recheck for an allowed CPU if the
affinity mask of the task has changed since the last check.

Return a 'bool' from cpuset_cpus_allowed_fallback() to indicate whether
the affinity mask was updated, and use this to elide the allowed check
when the mask has been left alone.

No functional change.

Suggested-by: Valentin Schneider <redacted>
Signed-off-by: Will Deacon <will@kernel.org>

Thanks!

Reviewed-by: Valentin Schneider <redacted>

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