Date: Sun, 12 Feb 2017 16:23:36 +0100 (CET) From: Thomas Gleixner <tglx@...utronix.de> To: Hoeun Ryu <hoeun.ryu@...il.com> cc: Andrew Morton <akpm@...ux-foundation.org>, Michal Hocko <mhocko@...e.com>, Ingo Molnar <mingo@...nel.org>, Andy Lutomirski <luto@...nel.org>, Kees Cook <keescook@...omium.org>, "Eric W. Biederman" <ebiederm@...ssion.com>, Oleg Nesterov <oleg@...hat.com>, Mateusz Guzik <mguzik@...hat.com>, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com Subject: Re: [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@...il.com> > Acked-by: Michal Hocko <mhocko@...e.com> Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
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