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| author | Ingo Molnar <mingo@kernel.org> | 2019-06-17 12:12:27 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-06-17 12:12:27 +0200 |
| commit | 23da766ab1dc005860b675bf048226a11a748bf9 (patch) | |
| tree | 3f8dbfc2cf68f5da3faa3a377087b06dd8ad343d /kernel/cgroup/cpuset.c | |
| parent | af75d1a9a9f75bf030c2f35705f1ff6d226f96fe (diff) | |
| parent | 9e0babf2c06c73cda2c0cd37a1653d823adb40ec (diff) | |
| download | lwn-23da766ab1dc005860b675bf048226a11a748bf9.tar.gz lwn-23da766ab1dc005860b675bf048226a11a748bf9.zip | |
Merge tag 'v5.2-rc5' into sched/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/cgroup/cpuset.c')
| -rw-r--r-- | kernel/cgroup/cpuset.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index fe90fa1899e6..a1590e244f5f 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -3254,10 +3254,23 @@ void cpuset_cpus_allowed(struct task_struct *tsk, struct cpumask *pmask) spin_unlock_irqrestore(&callback_lock, flags); } +/** + * cpuset_cpus_allowed_fallback - final fallback before complete catastrophe. + * @tsk: pointer to task_struct with which the scheduler is struggling + * + * Description: In the case that the scheduler cannot find an allowed cpu in + * tsk->cpus_allowed, we fall back to task_cs(tsk)->cpus_allowed. In legacy + * mode however, this value is the same as task_cs(tsk)->effective_cpus, + * which will not contain a sane cpumask during cases such as cpu hotplugging. + * This is the absolute last resort for the scheduler and it is only used if + * _every_ other avenue has been traveled. + **/ + void cpuset_cpus_allowed_fallback(struct task_struct *tsk) { rcu_read_lock(); - do_set_cpus_allowed(tsk, task_cs(tsk)->effective_cpus); + do_set_cpus_allowed(tsk, is_in_v2_mode() ? + task_cs(tsk)->cpus_allowed : cpu_possible_mask); rcu_read_unlock(); /* |