Re: inux-next: Tree for Apr 27 (uml + mm/memcontrol.c)

[David Rientjes <rientjes@xxxxxxxxxx>]

On Thu, 3 May 2012, David Rientjes wrote:

> Is this a claim that memory-intensive workloads will have the exact same 
> performance with and without memcg enabled?

I've just run specjbb2005 three times on my system both with and without 
cgroup_disable=memory on the command line and it is consistently 1% faster 
without memcg.  If I add XX:+UseLargePages to the command line to use 
hugepages it's even larger.  So why must I incur this performance 
degradation if I simply want to control who may mmap hugepages out of the 
global pool?

The functionality to control this is pretty important if I want to ensure 
applications aren't able to infringe on the preallocated hugepages of a 
higher priority application for business goals.
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