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 3sNBlb4FsKzDrJq for ; Mon, 29 Aug 2016 23:07:55 +1000 (AEST) Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.11/8.16.0.11) with SMTP id u7TD4TP7090501 for ; Mon, 29 Aug 2016 09:07:52 -0400 Received: from e23smtp03.au.ibm.com (e23smtp03.au.ibm.com [202.81.31.145]) by mx0a-001b2d01.pphosted.com with ESMTP id 253713f254-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 29 Aug 2016 09:07:52 -0400 Received: from localhost by e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 29 Aug 2016 23:07:50 +1000 Received: from d23relay07.au.ibm.com (d23relay07.au.ibm.com [9.190.26.37]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id A3BD22BB0057 for ; Mon, 29 Aug 2016 23:07:48 +1000 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay07.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u7TD7m1S62324984 for ; Mon, 29 Aug 2016 23:07:48 +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 u7TD7lY1013041 for ; Mon, 29 Aug 2016 23:07:48 +1000 From: Srikar Dronamraju To: Andrew Morton Cc: Srikar Dronamraju , linux-mm@kvack.org, Mel Gorman , Vlastimil Babka , Michal Hocko , Michael Ellerman , linuxppc-dev@lists.ozlabs.org, Mahesh Salgaonkar , Hari Bathini , Dave Hansen , Balbir Singh Subject: [PATCH v3 0/3] Account reserved memory when allocating system hash Date: Mon, 29 Aug 2016 18:36:47 +0530 Message-Id: <1472476010-4709-1-git-send-email-srikar@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Fadump kernel reserves large chunks of memory even before the pages are initialised. This could mean memory that corresponds to several nodes might fall in memblock reserved regions. 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. Dentry cache hash table entries: 536870912 (order: 16, 4294967296 bytes) vmalloc: allocation failure, allocated 4097114112 of 17179934720 bytes swapper/0: page allocation failure: order:0, mode:0x2080020(GFP_ATOMIC) CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.6-master+ #3 Call Trace: [c00000000108fb10] [c0000000007fac88] dump_stack+0xb0/0xf0 (unreliable) [c00000000108fb50] [c000000000235264] warn_alloc_failed+0x114/0x160 [c00000000108fbf0] [c000000000281484] __vmalloc_node_range+0x304/0x340 [c00000000108fca0] [c00000000028152c] __vmalloc+0x6c/0x90 [c00000000108fd40] [c000000000aecfb0] alloc_large_system_hash+0x1b8/0x2c0 [c00000000108fe00] [c000000000af7240] inode_init+0x94/0xe4 [c00000000108fe80] [c000000000af6fec] vfs_caches_init+0x8c/0x13c [c00000000108ff00] [c000000000ac4014] start_kernel+0x50c/0x578 [c00000000108ff90] [c000000000008c6c] start_here_common+0x20/0xa8 This patchset solves this problem by accounting the size of reserved memory when calculating the size of large system hashes. While this patchset applies on v4.8-rc3, it cannot be tested on v4.8-rc3 because of http://lkml.kernel.org/r/20160829093844.GA2592@linux.vnet.ibm.com However it has been tested on v4.7/v4.6 and v4.4 v2: http://lkml.kernel.org/r/1470330729-6273-1-git-send-email-srikar@linux.vnet.ibm.com Cc: linux-mm@kvack.org Cc: Mel Gorman Cc: Vlastimil Babka Cc: Michal Hocko Cc: Andrew Morton Cc: Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org Cc: Mahesh Salgaonkar Cc: Hari Bathini Cc: Dave Hansen Cc: Balbir Singh Cc: Srikar Dronamraju Srikar Dronamraju (3): mm: Introduce arch_reserved_kernel_pages() mm/memblock: Expose total reserved memory powerpc: Implement arch_reserved_kernel_pages arch/powerpc/include/asm/mmzone.h | 3 +++ arch/powerpc/kernel/fadump.c | 5 +++++ include/linux/memblock.h | 1 + include/linux/mm.h | 3 +++ mm/memblock.c | 5 +++++ mm/page_alloc.c | 12 ++++++++++++ 6 files changed, 29 insertions(+) -- 1.8.5.6