From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750769AbWHVSe1 (ORCPT ); Tue, 22 Aug 2006 14:34:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750770AbWHVSe1 (ORCPT ); Tue, 22 Aug 2006 14:34:27 -0400 Received: from e31.co.us.ibm.com ([32.97.110.149]:61081 "EHLO e31.co.us.ibm.com") by vger.kernel.org with ESMTP id S1750769AbWHVSe0 (ORCPT ); Tue, 22 Aug 2006 14:34:26 -0400 Subject: Re: [ckrm-tech] [PATCH 4/7] UBC: syscalls (user interface) From: Chandra Seetharaman Reply-To: sekharan@us.ibm.com To: Magnus Damm Cc: rohitseth@google.com, Rik van Riel , ckrm-tech@lists.sourceforge.net, Dave Hansen , Linux Kernel Mailing List , Andi Kleen , Christoph Hellwig , Andrey Savochkin , Alan Cox , hugh@veritas.com, Ingo Molnar , Kirill Korotaev , devel@openvz.org, Pavel Emelianov In-Reply-To: <1156219087.21411.89.camel@localhost> References: <44E33893.6020700@sw.ru> <44E33C3F.3010509@sw.ru> <1155752277.22595.70.camel@galaxy.corp.google.com> <1155755069.24077.392.camel@localhost.localdomain> <1155756170.22595.109.camel@galaxy.corp.google.com> <44E45D6A.8000003@sw.ru> <20060817084033.f199d4c7.akpm@osdl.org> <20060818120809.B11407@castle.nmd.msu.ru> <1155912348.9274.83.camel@localhost.localdomain> <1156128426.21411.41.camel@localhost> <1156209379.11127.15.camel@galaxy.corp.google.com> <1156219087.21411.89.camel@localhost> Content-Type: text/plain Organization: IBM Date: Tue, 22 Aug 2006 11:34:18 -0700 Message-Id: <1156271658.6479.89.camel@linuxchandra> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 (2.0.4-7) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2006-08-22 at 12:58 +0900, Magnus Damm wrote: > On Mon, 2006-08-21 at 18:16 -0700, Rohit Seth wrote: > > On Mon, 2006-08-21 at 11:47 +0900, Magnus Damm wrote: > > > On Fri, 2006-08-18 at 07:45 -0700, Dave Hansen wrote: > > > > On Fri, 2006-08-18 at 12:08 +0400, Andrey Savochkin wrote: > > > > > > > > > > A) Have separate memory management for each container, > > > > > with separate buddy allocator, lru lists, page replacement mechanism. > > > > > That implies a considerable overhead, and the main challenge there > > > > > is sharing of pages between these separate memory managers. > > > > > > > > Hold on here for just a sec... > > > > > > > > It is quite possible to do memory management aimed at one container > > > > while that container's memory still participates in the main VM. > > > > > > > > There is overhead here, as the LRU scanning mechanisms get less > > > > efficient, but I'd rather pay a penalty at LRU scanning time than divide > > > > up the VM, or coarsely start failing allocations. > > > > > > This could of course be solved with one LRU per container, which is how > > > the CKRM memory controller implemented things about a year ago. > > > > Effectively Andrew's idea of faking up nodes is also giving per > > container LRUs. > > Yes, but the NUMA emulation approach is using fixed size containers > where the size is selectable at the kernel command line, while the CKRM > (and pzone) approach provides a more dynamic (and complex) solution. NUMA emulation does not allow guarantee, only limits. It also doesn't allow over commit (ove commit issue is present in pzone based approach also). > > / magnus > > > ------------------------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, security? > Get stuff done quickly with pre-integrated technology to make your job easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > _______________________________________________ > ckrm-tech mailing list > https://lists.sourceforge.net/lists/listinfo/ckrm-tech -- ---------------------------------------------------------------------- Chandra Seetharaman | Be careful what you choose.... - sekharan@us.ibm.com | .......you may get it. ----------------------------------------------------------------------