Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932521AbWHRU0Z (ORCPT ); Fri, 18 Aug 2006 16:26:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932519AbWHRU0Z (ORCPT ); Fri, 18 Aug 2006 16:26:25 -0400 Received: from e34.co.us.ibm.com ([32.97.110.152]:37512 "EHLO e34.co.us.ibm.com") by vger.kernel.org with ESMTP id S932521AbWHRU0Y (ORCPT ); Fri, 18 Aug 2006 16:26:24 -0400 Subject: Re: [ckrm-tech] [RFC][PATCH 5/7] UBC: kernel memory accounting (core) From: Chandra Seetharaman Reply-To: sekharan@us.ibm.com To: Kirill Korotaev Cc: Andrew Morton , Rik van Riel , ckrm-tech@lists.sourceforge.net, Linux Kernel Mailing List , Andi Kleen , Christoph Hellwig , Andrey Savochkin , devel@openvz.org, hugh@veritas.com, Ingo Molnar , Alan Cox , Pavel Emelianov In-Reply-To: <44E33C8A.6030705@sw.ru> References: <44E33893.6020700@sw.ru> <44E33C8A.6030705@sw.ru> Content-Type: text/plain Organization: IBM Date: Fri, 18 Aug 2006 13:26:19 -0700 Message-Id: <1155932779.26155.87.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 Content-Length: 1786 Lines: 47 Kirill, IMO, a UBC with resource constraint(limit in this case) should behave no different than a kernel with limited memory. i.e it should do reclamation before it starts failing allocation requests. It could even do it preemptively. There is no guarantee support which is required for providing QoS. Each controller modifying the infrastructure code doesn't look good. We can have proper interfaces to add a new resource controller. chandra On Wed, 2006-08-16 at 19:40 +0400, Kirill Korotaev wrote: > Introduce UB_KMEMSIZE resource which accounts kernel > objects allocated by task's request. > > Reference to UB is kept on struct page or slab object. > For slabs each struct slab contains a set of pointers > corresponding objects are charged to. > > Allocation charge rules: > define1. Pages - if allocation is performed with __GFP_UBC flag - page > is charged to current's exec_ub. > 2. Slabs - kmem_cache may be created with SLAB_UBC flag - in this > case each allocation is charged. Caches used by kmalloc are > created with SLAB_UBC | SLAB_UBC_NOCHARGE flags. In this case > only __GFP_UBC allocations are charged. > > Signed-Off-By: Pavel Emelianov > Signed-Off-By: Kirill Korotaev > -- ---------------------------------------------------------------------- Chandra Seetharaman | Be careful what you choose.... - sekharan@us.ibm.com | .......you may get it. ---------------------------------------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/