From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f71.google.com (mail-wm0-f71.google.com [74.125.82.71]) by kanga.kvack.org (Postfix) with ESMTP id 888956B0253 for ; Thu, 4 Aug 2016 09:45:45 -0400 (EDT) Received: by mail-wm0-f71.google.com with SMTP id l4so147385072wml.0 for ; Thu, 04 Aug 2016 06:45:45 -0700 (PDT) Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com. [148.163.158.5]) by mx.google.com with ESMTPS id ev12si13720180wjc.104.2016.08.04.06.45.44 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 04 Aug 2016 06:45:44 -0700 (PDT) Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.11/8.16.0.11) with SMTP id u74DiFds012666 for ; Thu, 4 Aug 2016 09:45:43 -0400 Received: from e23smtp03.au.ibm.com (e23smtp03.au.ibm.com [202.81.31.145]) by mx0a-001b2d01.pphosted.com with ESMTP id 24kkak58tp-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 04 Aug 2016 09:45:42 -0400 Received: from localhost by e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 4 Aug 2016 23:45:37 +1000 Received: from d23relay08.au.ibm.com (d23relay08.au.ibm.com [9.185.71.33]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id 61EE82BB0057 for ; Thu, 4 Aug 2016 23:45:35 +1000 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay08.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u74DjZIL22610084 for ; Thu, 4 Aug 2016 23:45:35 +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 u74DjYhn025733 for ; Thu, 4 Aug 2016 23:45:35 +1000 From: Srikar Dronamraju Subject: [PATCH] fadump: Register the memory reserved by fadump Date: Thu, 4 Aug 2016 19:12:45 +0530 Message-Id: <1470318165-2521-1-git-send-email-srikar@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, Mel Gorman , Vlastimil Babka , Michal Hocko , Andrew Morton , Michael Ellerman , linuxppc-dev@lists.ozlabs.org, Mahesh Salgaonkar , Hari Bathini Cc: Dave Hansen , Balbir Singh , Srikar Dronamraju Fadump kernel reserves large chunks of memory even before the pages are initialized. This could mean memory that corresponds to several nodes might fall in memblock reserved regions. Kernels compiled with CONFIG_DEFERRED_STRUCT_PAGE_INIT will initialize only certain size memory per node. The certain size takes into account the dentry and inode cache sizes. Currently the cache sizes are calculated based on the total system memory including the reserved memory. However such a kernel when booting the same kernel as fadump 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 Register the memory reserved by fadump, so that the cache sizes are calculated based on the free memory (i.e Total memory - reserved memory). Suggested-by: Mel Gorman Signed-off-by: Srikar Dronamraju --- arch/powerpc/kernel/fadump.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index 3cb3b02a..eae547d 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -330,6 +330,7 @@ int __init fadump_reserve_mem(void) } fw_dump.reserve_dump_area_start = base; fw_dump.reserve_dump_area_size = size; + set_dma_reserve(size/PAGE_SIZE); return 1; } -- 1.8.5.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org