Re: [PATCH] memcg: implement boost mode

Kamezawa Hiroyuki
2013-04-01T09:27:45Z

(2013/04/01 16:34), Glauber Costa wrote:
> There are scenarios in which we would like our programs to run faster.
> It is a hassle, when they are contained in memcg, that some of its
> allocations will fail and start triggering reclaim. This is not good
> for the program, that will now be slower.
>
> This patch implements boost mode for memcg. It exposes a u64 file
> "memcg boost". Every time you write anything to it, it will reduce the
> counters by ~20 %. Note that we don't want to actually reclaim pages,
> which would defeat the very goal of boost mode. We just make the
> res_counters able to accomodate more.
>
> This file is also available in the root cgroup. But with a slightly
> different effect. Writing to it will make more memory physically
> available so our programs can profit.
>
> Please ack and apply.
>
Nack.

> Signed-off-by: Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>

Please update limit temporary. If you need call-shrink-explicitly-by-user,
I think you can add it.

Thanks,
-Kame