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SubjectRe: [PATCH v6] fork: free vmapped stacks in cache when cpus are offline
On Sun, 12 Feb 2017, Hoeun Ryu wrote:

> Using virtually mapped stack, kernel stacks are allocated via vmalloc.
> In the current implementation, two stacks per cpu can be cached when
> tasks are freed and the cached stacks are used again in task duplications.
> but the cached stacks may remain unfreed even when cpu are offline.
> By adding a cpu hotplug callback to free the cached stacks when a cpu
> goes offline, the pages of the cached stacks are not wasted.
>
> Signed-off-by: Hoeun Ryu <hoeun.ryu@gmail.com>
> Acked-by: Michal Hocko <mhocko@suse.com>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

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