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

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Message-ID: <alpine.DEB.2.00.1205031454400.1631@chino.kir.corp.google.com>
Date:	Thu, 3 May 2012 14:57:39 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>
cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Richard Weinberger <richard@....at>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: inux-next: Tree for Apr 27 (uml + mm/memcontrol.c)

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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