From patchwork Tue Jun 19 16:32:56 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Pieralisi X-Patchwork-Id: 10475045 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 512F160383 for ; Tue, 19 Jun 2018 16:33:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3D4C528973 for ; Tue, 19 Jun 2018 16:33:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2EA6B289D6; Tue, 19 Jun 2018 16:33:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CAE6328973 for ; Tue, 19 Jun 2018 16:33:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Jz5PERL2ES6lK643DMlLK1XBNlFzTdVdM7yj2a5XPy0=; b=YXi244fr1WfnH/ cG2MwPYoa+y3urM27ZKu445pexjFN+r1AipZaQp4qAMjjeYJWfHWspNwdE1UDoJJu2Pdj/NacyjJ7 bHg4/Dp+3++g/B0lUthmLysRlgWAyj91LUjUmHx9vhdah8g92p+3fGOZZ04EGF/waimDLgs2LbFcB MWO9iwJL9ci1eTiNUMutdTsBclpSH0Mx26GKCoJweUXmb3B6ditjdxeI8E3lvPk8yt2iKMrIgyM1Z fJ4FCrHgG2sxDEcKoyuC8DniC907UVQuzIsHsbSsSWM5+fFnoCNsbvr6Q2CtYX948I7XScCb5QRnx 6UT3INP/xlj+orukel6g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fVJZK-0003bg-0U; Tue, 19 Jun 2018 16:33:22 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fVJZG-0003aC-3X for linux-arm-kernel@lists.infradead.org; Tue, 19 Jun 2018 16:33:19 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 594461596; Tue, 19 Jun 2018 09:33:05 -0700 (PDT) Received: from e107981-ln.cambridge.arm.com (e107981-ln.cambridge.arm.com [10.1.207.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 443693F246; Tue, 19 Jun 2018 09:33:02 -0700 (PDT) Date: Tue, 19 Jun 2018 17:32:56 +0100 From: Lorenzo Pieralisi To: Punit Agrawal Subject: Re: [PATCH 1/2] arm64: avoid alloc memory on offline node Message-ID: <20180619163256.GA18952@e107981-ln.cambridge.arm.com> References: <20180611145330.GO13364@dhcp22.suse.cz> <87lgbk59gs.fsf@e105922-lin.cambridge.arm.com> <87bmce60y3.fsf@e105922-lin.cambridge.arm.com> <8b715082-14d4-f10b-d2d6-b23be7e4bf7e@huawei.com> <20180619120714.GE13685@dhcp22.suse.cz> <874lhz3pmn.fsf@e105922-lin.cambridge.arm.com> <20180619140818.GA16927@e107981-ln.cambridge.arm.com> <87wouu3jz1.fsf@e105922-lin.cambridge.arm.com> <20180619151425.GH13685@dhcp22.suse.cz> <87r2l23i2b.fsf@e105922-lin.cambridge.arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87r2l23i2b.fsf@e105922-lin.cambridge.arm.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180619_093318_159387_AE70DCC5 X-CRM114-Status: GOOD ( 25.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , tnowicki@caviumnetworks.com, Xie XiuQi , linux-pci@vger.kernel.org, "Rafael J. Wysocki" , Will Deacon , Linux Kernel Mailing List , Jarkko Sakkinen , Michal Hocko , linux-mm@kvack.org, Greg Kroah-Hartman , Bjorn Helgaas , linux-arm , Hanjun Guo , Bjorn Helgaas , Andrew Morton , zhongjiang , wanghuiqiang@huawei.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP On Tue, Jun 19, 2018 at 04:35:40PM +0100, Punit Agrawal wrote: > Michal Hocko writes: > > > On Tue 19-06-18 15:54:26, Punit Agrawal wrote: > > [...] > >> In terms of $SUBJECT, I wonder if it's worth taking the original patch > >> as a temporary fix (it'll also be easier to backport) while we work on > >> fixing these other issues and enabling memoryless nodes. > > > > Well, x86 already does that but copying this antipatern is not really > > nice. So it is good as a quick fix but it would be definitely much > > better to have a robust fix. Who knows how many other places might hit > > this. You certainly do not want to add a hack like this all over... > > Completely agree! I was only suggesting it as a temporary measure, > especially as it looked like a proper fix might be invasive. > > Another fix might be to change the node specific allocation to node > agnostic allocations. It isn't clear why the allocation is being > requested from a specific node. I think Lorenzo suggested this in one of > the threads. I think that code was just copypasted but it is better to fix the underlying issue. > I've started putting together a set fixing the issues identified in this > thread. It should give a better idea on the best course of action. On ACPI ARM64, this diff should do if I read the code correctly, it should be (famous last words) just a matter of mapping PXMs to nodes for every SRAT GICC entry, feel free to pick it up if it works. Yes, we can take the original patch just because it is safer for an -rc cycle even though if the patch below would do delaying the fix for a couple of -rc (to get it tested across ACPI ARM64 NUMA platforms) is not a disaster. Lorenzo -- >8 -- diff --git a/arch/arm64/kernel/acpi_numa.c b/arch/arm64/kernel/acpi_numa.c index d190a7b231bf..877b268ef9fa 100644 --- a/arch/arm64/kernel/acpi_numa.c +++ b/arch/arm64/kernel/acpi_numa.c @@ -70,12 +70,6 @@ void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa) if (!(pa->flags & ACPI_SRAT_GICC_ENABLED)) return; - if (cpus_in_srat >= NR_CPUS) { - pr_warn_once("SRAT: cpu_to_node_map[%d] is too small, may not be able to use all cpus\n", - NR_CPUS); - return; - } - pxm = pa->proximity_domain; node = acpi_map_pxm_to_node(pxm); @@ -85,6 +79,14 @@ void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa) return; } + node_set(node, numa_nodes_parsed); + + if (cpus_in_srat >= NR_CPUS) { + pr_warn_once("SRAT: cpu_to_node_map[%d] is too small, may not be able to use all cpus\n", + NR_CPUS); + return; + } + mpidr = acpi_map_madt_entry(pa->acpi_processor_uid); if (mpidr == PHYS_CPUID_INVALID) { pr_err("SRAT: PXM %d with ACPI ID %d has no valid MPIDR in MADT\n", @@ -95,7 +97,6 @@ void __init acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa) early_node_cpu_hwid[cpus_in_srat].node_id = node; early_node_cpu_hwid[cpus_in_srat].cpu_hwid = mpidr; - node_set(node, numa_nodes_parsed); cpus_in_srat++; pr_info("SRAT: PXM %d -> MPIDR 0x%Lx -> Node %d\n", pxm, mpidr, node);