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sched: Consolidate the notifier maze

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We can maintain the ordering of the scheduler cpu hotplug functionality nicely
in one notifer. Get rid of the maze.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: rt@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2016-03-10 12:54:11 +01:00
parent e26fbffd32
commit 135fb3e197
2 changed files with 73 additions and 113 deletions
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12
include/linux/cpu.h
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@ -61,19 +61,15 @@ struct notifier_block;
enum {
/*
* SCHED_ACTIVE marks a cpu which is coming up active during
* CPU_ONLINE and CPU_DOWN_FAILED and must be the first
* notifier. CPUSET_ACTIVE adjusts cpuset according to
* cpu_active mask right after SCHED_ACTIVE. During
* CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are
* ordered in the similar way.
* CPU_ONLINE and CPU_DOWN_FAILED and must be the first notifier. Is
* also cpuset according to cpu_active mask right after activating the
* cpu. During CPU_DOWN_PREPARE, SCHED_INACTIVE reversed the operation.
*
* This ordering guarantees consistent cpu_active mask and
* migration behavior to all cpu notifiers.
*/
CPU_PRI_SCHED_ACTIVE = INT_MAX,
CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1,
CPU_PRI_SCHED_INACTIVE = INT_MIN + 1,
CPU_PRI_CPUSET_INACTIVE = INT_MIN,
CPU_PRI_SCHED_INACTIVE = INT_MIN,
/* migration should happen before other stuff but after perf */
CPU_PRI_PERF = 20,