for-next/pgtable branch: OOM error with 16K page size

Hi,

On Tue, Mar 01, 2016 at 10:48:02AM +0000, Jaggi, Manish wrote:

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From: linux-arm-kernel <redacted> on behalf of Jaggi, Manish <redacted>
Sent: Monday, February 29, 2016 5:56 PM
To: linux-arm-kernel at lists.infradead.org
Subject: for-next/pgtable branch: OOM error with 16K page size

Hi All,

I am trying to use the for-next/pgtable branch with the top commit,

The same issue is observed with for-next/core branch

I take it that you do not see this issue on v4.5-rc4?

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commit 068a17a5805dfbca4bbf03e664ca6b19709cc7a8
Author: Mark Rutland [off-list ref]
Date:   Mon Jan 25 11:45:12 2016 +0000

  arm64: mm: create new fine-grained mappings at boot

Setup: ARMv8, Cavium ThunderX, 48Cores 64G ram.
linux config: defconfig + 16k page size.

Observations:
a) During linux boot I see some oom messages
http://pastebin.com/8jSMFhqf

Could you try again with "efi=debug"? If possible, also
"memblock=debug", though the latter will hugely increase the dmesg
output.

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b) cat /proc/meminfo

MemTotal:         66613760 kB
MemFree:          307328 kB
MemAvailable:      22416 kB

Available memory is very less compared to total.

c) With 64K pagesize
MemTotal:       66831552 kB
MemFree:         3541184 kB
MemAvailable:    3298752 kB

The former does look very odd.

Could you dump the full contents of /proc/meminfo for both of these
cases?

Thanks,
Mark.