From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3s43L46dhbzDqQt for ; Wed, 3 Aug 2016 16:38:20 +1000 (AEST) Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.11/8.16.0.11) with SMTP id u736XsnR135765 for ; Wed, 3 Aug 2016 02:38:19 -0400 Received: from e23smtp03.au.ibm.com (e23smtp03.au.ibm.com [202.81.31.145]) by mx0a-001b2d01.pphosted.com with ESMTP id 24k0bmp1k3-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Wed, 03 Aug 2016 02:38:18 -0400 Received: from localhost by e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 3 Aug 2016 16:38:16 +1000 Received: from d23relay06.au.ibm.com (d23relay06.au.ibm.com [9.185.63.219]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id E0BCE3578052 for ; Wed, 3 Aug 2016 16:38:12 +1000 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay06.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u736cClq26804228 for ; Wed, 3 Aug 2016 16:38:12 +1000 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u736cBas027504 for ; Wed, 3 Aug 2016 16:38:12 +1000 Date: Wed, 3 Aug 2016 12:08:08 +0530 From: Srikar Dronamraju To: Dave Hansen Cc: linux-mm@kvack.org, Mel Gorman , Vlastimil Babka , Michal Hocko , Andrew Morton , Michael Ellerman , linuxppc-dev@lists.ozlabs.org, mahesh@linux.vnet.ibm.com, hbathini@linux.vnet.ibm.com Subject: Re: [PATCH 1/2] mm: Allow disabling deferred struct page initialisation Reply-To: Srikar Dronamraju References: <1470143947-24443-1-git-send-email-srikar@linux.vnet.ibm.com> <1470143947-24443-2-git-send-email-srikar@linux.vnet.ibm.com> <57A0E1D1.8020608@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 In-Reply-To: <57A0E1D1.8020608@intel.com> Message-Id: <20160803063808.GI6310@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , * Dave Hansen [2016-08-02 11:09:21]: > On 08/02/2016 06:19 AM, Srikar Dronamraju wrote: > > Kernels compiled with CONFIG_DEFERRED_STRUCT_PAGE_INIT will initialise > > only certain size memory per node. The certain size takes into account > > the dentry and inode cache sizes. However such a kernel when booting a > > secondary kernel will not be able to allocate the required amount of > > memory to suffice for the dentry and inode caches. This results in > > crashes like the below on large systems such as 32 TB systems. > > What's a "secondary kernel"? > I mean the kernel thats booted to collect the crash, On fadump, the first kernel acts as the secondary kernel i.e the same kernel is booted to collect the crash. -- Thanks and Regards Srikar Dronamraju