From: Vlastimil Babka <vbabka@suse.cz>
To: Li Zhang <zhlcindy@gmail.com>,
akpm@linux-foundation.org, mgorman@techsingularity.net,
mpe@ellerman.id.au, khandual@linux.vnet.ibm.com,
aneesh.kumar@linux.vnet.ibm.com
Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org,
Li Zhang <zhlcindy@linux.vnet.ibm.com>
Subject: Re: [PATCH 1/2] mm: meminit: initialise more memory for inode/dentry hash tables in early boot
Date: Tue, 8 Mar 2016 14:25:40 +0100 [thread overview]
Message-ID: <56DED2D4.4060805@suse.cz> (raw)
In-Reply-To: <1457409354-10867-2-git-send-email-zhlcindy@gmail.com>
On 03/08/2016 04:55 AM, Li Zhang wrote:
> From: Li Zhang <zhlcindy@linux.vnet.ibm.com>
>
> This patch is based on Mel Gorman's old patch in the mailing list,
> https://lkml.org/lkml/2015/5/5/280 which is discussed but it is
> fixed with a completion to wait for all memory initialised in
> page_alloc_init_late(). It is to fix the OOM problem on X86
> with 24TB memory which allocates memory in late initialisation.
> But for Power platform with 32TB memory, it causes a call trace
> in vfs_caches_init->inode_init() and inode hash table needs more
> memory.
> So this patch allocates 1GB for 0.25TB/node for large system
> as it is mentioned in https://lkml.org/lkml/2015/5/1/627
>
> This call trace is found on Power with 32TB memory, 1024CPUs, 16nodes.
> Currently, it only allocates 2GB*16=32GB for early initialisation. But
> Dentry cache hash table needes 16GB and Inode cache hash table needs
> 16GB. So the system have no enough memory for it.
> The log from dmesg as the following:
>
> Dentry cache hash table entries: 2147483648 (order: 18,17179869184 bytes)
> vmalloc: allocation failure, allocated 16021913600 of 17179934720 bytes
> swapper/0: page allocation failure: order:0,mode:0x2080020
> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.0-0-ppc64
> Call Trace:
> [c0000000012bfa00] [c0000000007c4a50].dump_stack+0xb4/0xb664 (unreliable)
> [c0000000012bfa80] [c0000000001f93d4].warn_alloc_failed+0x114/0x160
> [c0000000012bfb30] [c00000000023c204].__vmalloc_area_node+0x1a4/0x2b0
> [c0000000012bfbf0] [c00000000023c3f4].__vmalloc_node_range+0xe4/0x110
> [c0000000012bfc90] [c00000000023c460].__vmalloc_node+0x40/0x50
> [c0000000012bfd10] [c000000000b67d60].alloc_large_system_hash+0x134/0x2a4
> [c0000000012bfdd0] [c000000000b70924].inode_init+0xa4/0xf0
> [c0000000012bfe60] [c000000000b706a0].vfs_caches_init+0x80/0x144
> [c0000000012bfef0] [c000000000b35208].start_kernel+0x40c/0x4e0
> [c0000000012bff90] [c000000000008cfc]start_here_common+0x20/0x4a4
> Mem-Info:
>
> Acked-by: Mel Gorman <mgorman@techsingularity.net>
> Signed-off-by: Li Zhang <zhlcindy@linux.vnet.ibm.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
next prev parent reply other threads:[~2016-03-08 13:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-08 3:55 [PATCH 0/2] mm: Enable page parallel initialisation for Power Li Zhang
2016-03-08 3:55 ` [PATCH 1/2] mm: meminit: initialise more memory for inode/dentry hash tables in early boot Li Zhang
2016-03-08 13:25 ` Vlastimil Babka [this message]
2016-03-08 3:55 ` [PATCH 2/2] powerpc/mm: Enable page parallel initialisation Li Zhang
2016-03-08 9:36 ` Michael Ellerman
2016-03-09 2:06 ` Li Zhang
2016-03-09 21:42 ` Andrew Morton
2016-03-10 0:28 ` Michael Ellerman
2016-03-08 14:45 ` [PATCH 0/2] mm: Enable page parallel initialisation for Power Balbir Singh
2016-03-09 4:17 ` Li Zhang
2016-03-09 4:28 ` Balbir Singh
2016-03-09 5:50 ` Li Zhang
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