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cpu-hotplug: refcount based cpu hotplug

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This patch implements a Refcount + Waitqueue based model for
cpu-hotplug.

Now, a thread which wants to prevent cpu-hotplug, will bump up a global
refcount and the thread which wants to perform a cpu-hotplug operation
will block till the global refcount goes to zero.

The readers, if any, during an ongoing cpu-hotplug operation are blocked
until the cpu-hotplug operation is over.

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Paul Jackson <pj@sgi.com> [For !CONFIG_HOTPLUG_CPU ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Gautham R Shenoy
2008-01-25 21:08:01 +01:00
committed by Ingo Molnar
parent 6b2d770026
commit d221938c04
3 changed files with 115 additions and 41 deletions
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3
include/linux/cpu.h
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@@ -83,6 +83,9 @@ static inline void unregister_cpu_notifier(struct notifier_block *nb)
#endif /* CONFIG_SMP */
extern struct sysdev_class cpu_sysdev_class;
extern void cpu_hotplug_init(void);
extern void cpu_maps_update_begin(void);
extern void cpu_maps_update_done(void);
#ifdef CONFIG_HOTPLUG_CPU
/* Stop CPUs going up and down. */