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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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5
lib/smp_processor_id.c
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@@ -26,6 +26,11 @@ unsigned int check_preemption_disabled(const char *what1, const char *what2)
if (current->nr_cpus_allowed == 1)
goto out;
#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT)
if (current->migration_disabled)
goto out;
#endif
/*
* It is valid to assume CPU-locality during early bootup:
*/