diff options
| -rw-r--r-- | kernel/cgroup/cpuset.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 142303abb055..f321ed515f3a 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -581,12 +581,24 @@ static int validate_change(struct cpuset *cur, struct cpuset *trial) /* * We can't shrink if we won't have enough room for SCHED_DEADLINE - * tasks. + * tasks. This check is not done when scheduling is disabled as the + * users should know what they are doing. + * + * For v1, effective_cpus == cpus_allowed & user_xcpus() returns + * cpus_allowed. + * + * For v2, is_cpu_exclusive() & is_sched_load_balance() are true only + * for non-isolated partition root. At this point, the target + * effective_cpus isn't computed yet. user_xcpus() is the best + * approximation. + * + * TBD: May need to precompute the real effective_cpus here in case + * incorrect scheduling of SCHED_DEADLINE tasks in a partition + * becomes an issue. */ ret = -EBUSY; - if (is_cpu_exclusive(cur) && - !cpuset_cpumask_can_shrink(cur->cpus_allowed, - trial->cpus_allowed)) + if (is_cpu_exclusive(cur) && is_sched_load_balance(cur) && + !cpuset_cpumask_can_shrink(cur->effective_cpus, user_xcpus(trial))) goto out; /* |