(2013/04/01 18:37), Michal Hocko wrote:
On Mon 01-04-13 13:30:22, Glauber Costa wrote:
On 04/01/2013 01:27 PM, Kamezawa Hiroyuki wrote:
(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@xxxxxxxxxxxxx>
Please update limit temporary. If you need call-shrink-explicitly-by-user,
I think you can add it.
I don't want to shrink memory because that will make applications
slower. I want them to be faster, so they need to have more memory.
There is solid research backing up my approach:
http://www.dilbert.com/fast/2008-05-08/
:)
;)
-Kame
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