lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:   Sun, 12 Feb 2017 16:23:36 +0100 (CET)
From:   Thomas Gleixner <>
To:     Hoeun Ryu <>
cc:     Andrew Morton <>,
        Michal Hocko <>, Ingo Molnar <>,
        Andy Lutomirski <>,
        Kees Cook <>,
        "Eric W. Biederman" <>,
        Oleg Nesterov <>,
        Mateusz Guzik <>,,
Subject: Re: [PATCH v6] fork: free vmapped stacks in cache when cpus are

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 <>
> Acked-by: Michal Hocko <>

Reviewed-by: Thomas Gleixner <>

Powered by blists - more mailing lists