From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nick Piggin Subject: Re: [RFC][PATCH] Remove cgroup member from struct page Date: Tue, 9 Sep 2008 13:58:27 +1000 References: <20080901161927.a1fe5afc.kamezawa.hiroyu@jp.fujitsu.com> <20080908152810.GA12065@balbir.in.ibm.com> <20080909125751.37042345.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20080909125751.37042345.kamezawa.hiroyu@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200809091358.28350.nickpiggin@yahoo.com.au> Sender: owner-linux-mm@kvack.org Return-Path: To: KAMEZAWA Hiroyuki Cc: balbir@linux.vnet.ibm.com, Andrew Morton , hugh@veritas.com, menage@google.com, xemul@openvz.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Tuesday 09 September 2008 13:57, KAMEZAWA Hiroyuki wrote: > On Mon, 8 Sep 2008 20:58:10 +0530 > > Balbir Singh wrote: > > Sorry for the delay in sending out the new patch, I am traveling and > > thus a little less responsive. Here is the update patch > > Hmm.. I've considered this approach for a while and my answer is that > this is not what you really want. > > Because you just moves the placement of pointer from memmap to > radix_tree both in GFP_KERNEL, total kernel memory usage is not changed. > So, at least, you have to add some address calculation (as I did in March) > to getting address of page_cgroup. But page_cgroup itself consumes 32bytes > per page. Then..... Just keep in mind that an important point is to make it more attractive to configure cgroup into the kernel, but have it disabled or unused at runtime. -- 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/ . Don't email: email@kvack.org