From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx145.postini.com [74.125.245.145]) by kanga.kvack.org (Postfix) with SMTP id EA7F4940001 for ; Thu, 24 May 2012 19:20:26 -0400 (EDT) Received: by dakp5 with SMTP id p5so542895dak.14 for ; Thu, 24 May 2012 16:20:26 -0700 (PDT) Date: Thu, 24 May 2012 16:20:23 -0700 (PDT) From: David Rientjes Subject: Re: [PATCH -V6 07/14] memcg: Add HugeTLB extension In-Reply-To: <20120524155727.dc6c839e.akpm@linux-foundation.org> Message-ID: References: <1334573091-18602-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <1334573091-18602-8-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <20120524155727.dc6c839e.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: "Aneesh Kumar K.V" , linux-mm@kvack.org, mgorman@suse.de, KAMEZAWA Hiroyuki , dhillf@gmail.com, aarcange@redhat.com, mhocko@suse.cz, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org On Thu, 24 May 2012, Andrew Morton wrote: > These arguments look pretty strong to me. But poorly timed :( > What I argued here is nothing new, I said the same thing back on April 27 and I was expecting it to be reproposed as a seperate controller. The counter argument that memcg shouldn't cause a performance degradation doesn't hold water: you can't expect every page to be tracked without incurring some penalty somewhere. And it certainly causes ~1% of memory to be used up at boot with all the struct page_cgroups. The counter argument that we'd have to duplicate cgroup setup and initialization code from memcg also is irrelevant: all generic cgroup mounting, creation, and initialization code should be in kernel/cgroup.c. Obviously there will be added code because we're introducing a new cgroup, but that's not a reason to force everybody who wants to control hugetlb pages to be forced to enable memcg. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org