From: Dave Hansen <dave.hansen@intel.com>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: linux-mm@kvack.org, Mel Gorman <mgorman@techsingularity.net>,
Vlastimil Babka <vbabka@suse.cz>,
Michal Hocko <mhocko@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Michael Ellerman <mpe@ellerman.id.au>,
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
Date: Wed, 3 Aug 2016 11:17:43 -0700 [thread overview]
Message-ID: <57A23547.1070207@intel.com> (raw)
In-Reply-To: <20160803063808.GI6310@linux.vnet.ibm.com>
On 08/02/2016 11:38 PM, Srikar Dronamraju wrote:
> * Dave Hansen <dave.hansen@intel.com> [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.
OK, but I'm still not seeing what the problem is. You've said that it
crashes and that it crashes during inode/dentry cache allocation.
But, *why* does the same kernel image crash in when it is used as a
"secondary kernel"?
next prev parent reply other threads:[~2016-08-03 18:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-02 13:19 [PATCH 0/0] Disable deferred struct page initialisation on Fadump Srikar Dronamraju
2016-08-02 13:19 ` [PATCH 1/2] mm: Allow disabling deferred struct page initialisation Srikar Dronamraju
2016-08-02 18:09 ` Dave Hansen
2016-08-03 6:38 ` Srikar Dronamraju
2016-08-03 18:17 ` Dave Hansen [this message]
2016-08-04 5:25 ` Srikar Dronamraju
2016-08-02 13:19 ` [PATCH 2/2] fadump: Disable deferred page struct initialisation Srikar Dronamraju
2016-08-03 5:20 ` Balbir Singh
2016-08-03 6:07 ` Vlastimil Babka
2016-08-03 11:34 ` Michael Ellerman
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