diff options
| author | Frederic Weisbecker <frederic@kernel.org> | 2024-09-27 00:48:59 +0200 |
|---|---|---|
| committer | Frederic Weisbecker <frederic@kernel.org> | 2025-01-08 18:14:23 +0100 |
| commit | 3a5446612a3f2579c751ddb77c5e16b9a0d47001 (patch) | |
| tree | 85821711656799136a08430662f71e211a936463 /include/linux | |
| parent | 4a1567b466ecaa411cfe54c82009de7899e96171 (diff) | |
sched,arm64: Handle CPU isolation on last resort fallback rq selection
When a kthread or any other task has an affinity mask that is fully
offline or unallowed, the scheduler reaffines the task to all possible
CPUs as a last resort.
This default decision doesn't mix up very well with nohz_full CPUs that
are part of the possible cpumask but don't want to be disturbed by
unbound kthreads or even detached pinned user tasks.
Make the fallback affinity setting aware of nohz_full.
Suggested-by: Michal Hocko <mhocko@suse.com>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mmu_context.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mmu_context.h b/include/linux/mmu_context.h index bbaec80c78c5..ac01dc4eb2ce 100644 --- a/include/linux/mmu_context.h +++ b/include/linux/mmu_context.h @@ -24,6 +24,7 @@ static inline void leave_mm(void) { } #ifndef task_cpu_possible_mask # define task_cpu_possible_mask(p) cpu_possible_mask # define task_cpu_possible(cpu, p) true +# define task_cpu_fallback_mask(p) housekeeping_cpumask(HK_TYPE_TICK) #else # define task_cpu_possible(cpu, p) cpumask_test_cpu((cpu), task_cpu_possible_mask(p)) #endif |