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sched: Add migrate_disable()

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Add the base migrate_disable() support (under protest).

While migrate_disable() is (currently) required for PREEMPT_RT, it is
also one of the biggest flaws in the system.

Notably this is just the base implementation, it is broken vs
sched_setaffinity() and hotplug, both solved in additional patches for
ease of review.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Reviewed-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Link: https://lkml.kernel.org/r/20201023102346.818170844@infradead.org
This commit is contained in:
Peter Zijlstra
2020-09-17 10:38:30 +02:00
parent 9cfc3e18ad
commit af449901b8
5 changed files with 183 additions and 8 deletions
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3
include/linux/sched.h
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@@ -714,6 +714,9 @@ struct task_struct {
int nr_cpus_allowed;
const cpumask_t *cpus_ptr;
cpumask_t cpus_mask;
#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT)
int migration_disabled;
#endif
#ifdef CONFIG_PREEMPT_RCU
int rcu_read_lock_nesting;