Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932834AbWKJK23 (ORCPT ); Fri, 10 Nov 2006 05:28:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932835AbWKJK23 (ORCPT ); Fri, 10 Nov 2006 05:28:29 -0500 Received: from ausmtp04.au.ibm.com ([202.81.18.152]:49297 "EHLO ausmtp04.au.ibm.com") by vger.kernel.org with ESMTP id S932635AbWKJK21 (ORCPT ); Fri, 10 Nov 2006 05:28:27 -0500 Message-ID: <45545429.7080903@in.ibm.com> Date: Fri, 10 Nov 2006 15:57:53 +0530 From: Balbir Singh Reply-To: balbir@in.ibm.com Organization: IBM User-Agent: Thunderbird 1.5.0.7 (X11/20060922) MIME-Version: 1.0 To: Pavel Emelianov CC: dev@openvz.org, ckrm-tech@lists.sourceforge.net, haveblue@us.ibm.com, Linux Kernel Mailing List , Linux MM , rohitseth@google.com Subject: Re: [ckrm-tech] [RFC][PATCH 6/8] RSS controller shares allocation References: <20061109193523.21437.86224.sendpatchset@balbir.in.ibm.com> <20061109193619.21437.84173.sendpatchset@balbir.in.ibm.com> <45544240.80609@openvz.org> In-Reply-To: <45544240.80609@openvz.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2674 Lines: 95 Pavel Emelianov wrote: > Balbir Singh wrote: >> Support shares assignment and propagation. >> >> Signed-off-by: Balbir Singh >> --- >> >> kernel/res_group/memctlr.c | 59 ++++++++++++++++++++++++++++++++++++++++++++- >> 1 file changed, 58 insertions(+), 1 deletion(-) > > [snip] > >> +static void recalc_and_propagate(struct memctlr *res, struct memctlr *parres) >> +{ >> + struct resource_group *child = NULL; >> + int child_divisor; >> + u64 numerator; >> + struct memctlr *child_res; >> + >> + if (parres) { >> + if (res->shares.max_shares == SHARE_DONT_CARE || >> + parres->shares.max_shares == SHARE_DONT_CARE) >> + return; >> + >> + child_divisor = parres->shares.child_shares_divisor; >> + if (child_divisor == 0) >> + return; >> + >> + numerator = (u64)(parres->shares.unused_min_shares * >> + res->shares.max_shares); >> + do_div(numerator, child_divisor); >> + numerator = (u64)(parres->nr_pages * numerator); >> + do_div(numerator, SHARE_DEFAULT_DIVISOR); >> + res->nr_pages = numerator; >> + } >> + >> + for_each_child(child, res->rgroup) { >> + child_res = get_memctlr(child); >> + BUG_ON(!child_res); >> + recalc_and_propagate(child_res, res); > > Recursion? Won't it eat all the stack in case of a deep tree? The depth of the hierarchy can be controlled. Recursion is needed to do a DFS walk > >> + } >> + >> +} >> + >> +static void memctlr_shares_changed(struct res_shares *shares) >> +{ >> + struct memctlr *res, *parres; >> + >> + res = get_memctlr_from_shares(shares); >> + if (!res) >> + return; >> + >> + if (is_res_group_root(res->rgroup)) >> + parres = NULL; >> + else >> + parres = get_memctlr((struct container *)res->rgroup->parent); >> + >> + recalc_and_propagate(res, parres); >> +} >> + >> struct res_controller memctlr_rg = { >> .name = res_ctlr_name, >> .ctlr_id = NO_RES_ID, >> .alloc_shares_struct = memctlr_alloc_instance, >> .free_shares_struct = memctlr_free_instance, >> .move_task = memctlr_move_task, >> - .shares_changed = NULL, >> + .shares_changed = memctlr_shares_changed, > > I didn't find where in this patches this callback is called. It's a part of the resource groups infrastructure. It's been ported on top of Paul Menage's containers patches. The code can be easily adapted to work directly with containers instead of resource groups if required. -- Balbir Singh, Linux Technology Center, IBM Software Labs - 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/