[linux-mm] Drastic increase in application memory usage with Kernel version upgrade

From	PINTU KUMAR <pintu.k@samsung.com>
Newsgroups	linux.kernel
Subject	[linux-mm] Drastic increase in application memory usage with Kernel version upgrade
Date	2016-08-05 07:00 +0200
Message-ID	<s2FoJ-2RO-5@gated-at.bofh.it> (permalink)
References	<s2FoJ-2RO-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi All,

For one of our ARM embedded product, we recently updated the Kernel version from
3.4 to 3.18 and we noticed that the same application memory usage (PSS value)
gone up by ~10% and for some cases it even crossed ~50%.
There is no change in platform part. All platform component was built with ARM
32-bit toolchain.
However, the Kernel is changed from 32-bit to 64-bit.

Is upgrading Kernel version and moving from 32-bit to 64-bit is such a risk ?
After the upgrade, what can we do further to reduce the application memory usage
?
Is there any other factor that will help us to improve without major
modifications in platform ?

As a proof, we did a small experiment on our Ubuntu-32 bit machine.
We upgraded Ubuntu Kernel version from 3.13 to 4.01 and we observed the
following:
--------------------------------------------------------------------------------
-------------
|UBUNTU-32 bit		|Kernel 3.13	|Kernel 4.03	|DIFF	|
|CALCULATOR PSS	|6057 KB	|6466 KB	|409 KB	|
--------------------------------------------------------------------------------
-------------
So, just by upgrading the Kernel version: PSS value for calculator is increased
by 409KB.

If anybody knows any in-sight about it please point out more details about the
root cause.

Thank You!

Regards,
Pintu

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Thread

[linux-mm] Drastic increase in application memory usage with Kernel  version upgrade PINTU KUMAR <pintu.k@samsung.com> - 2016-08-05 07:00 +0200
  Re: [linux-mm] Drastic increase in application memory usage with  Kernel version upgrade Minchan Kim <minchan@kernel.org> - 2016-08-05 10:20 +0200
    RE: [linux-mm] Drastic increase in application memory usage with  Kernel version upgrade PINTU KUMAR <pintu.k@samsung.com> - 2016-08-05 16:50 +0200
      Re: [linux-mm] Drastic increase in application memory usage with  Kernel version upgrade Pavel Machek <pavel@ucw.cz> - 2016-08-05 23:00 +0200
        RE: [linux-mm] Drastic increase in application memory usage with  Kernel version upgrade PINTU KUMAR <pintu.k@samsung.com> - 2016-08-10 21:40 +0200

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