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| author | Frederic Weisbecker <frederic@kernel.org> | 2025-06-02 13:32:32 +0300 |
|---|---|---|
| committer | Frederic Weisbecker <frederic@kernel.org> | 2026-02-03 17:23:34 +0300 |
| commit | 1c3329df409b9b50517bf4a1399ed793d277a20c (patch) | |
| tree | 077b8a36df282db2be1e7f0b2eb6c100fec934aa /include/linux | |
| parent | 6440966067dc078f7b46942b3e2cb5d1035fc0b9 (diff) | |
| download | linux-1c3329df409b9b50517bf4a1399ed793d277a20c.tar.xz | |
sched/isolation: Remove HK_TYPE_TICK test from cpu_is_isolated()
It doesn't make sense to use nohz_full without also isolating the
related CPUs from the domain topology, either through the use of
isolcpus= or cpuset isolated partitions.
And now HK_TYPE_DOMAIN includes all kinds of domain isolated CPUs.
This means that HK_TYPE_DOMAIN should always be a subset of
HK_TYPE_KERNEL_NOISE (of which HK_TYPE_TICK is only an alias).
Therefore if a CPU is not HK_TYPE_DOMAIN, it shouldn't be
HK_TYPE_KERNEL_NOISE either. Testing the former is then enough.
Simplify cpu_is_isolated() accordingly.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Waiman Long <longman@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Marco Crivellari <marco.crivellari@suse.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Waiman Long <longman@redhat.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/sched/isolation.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index d0fb0f647318..dc3975ff1b2e 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -82,8 +82,7 @@ static inline bool housekeeping_cpu(int cpu, enum hk_type type) static inline bool cpu_is_isolated(int cpu) { - return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN) || - !housekeeping_test_cpu(cpu, HK_TYPE_TICK); + return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN); } #endif /* _LINUX_SCHED_ISOLATION_H */ |