From: Minchan Kim <minchan@kernel.org>
To: PINTU KUMAR <pintu.k@samsung.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
jaejoon.seo@samsung.com, jy0.jeon@samsung.com,
vishnu.ps@samsung.com
Subject: Re: [linux-mm] Drastic increase in application memory usage with Kernel version upgrade
Date: Fri, 5 Aug 2016 17:20:15 +0900 [thread overview]
Message-ID: <20160805082015.GA28235@bbox> (raw)
In-Reply-To: <01a001d1eed5$c50726c0$4f157440$@samsung.com>
On Fri, Aug 05, 2016 at 10:26:37AM +0530, PINTU KUMAR wrote:
> 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.
One of culprit is [8c6e50b0290c, mm: introduce vm_ops->map_pages()].
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next prev parent reply other threads:[~2016-08-05 15:36 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20160805045709epcas3p1dc6f12f2fa3031112c4da5379e33b5e9@epcas3p1.samsung.com>
2016-08-05 4:56 ` [linux-mm] Drastic increase in application memory usage with Kernel version upgrade PINTU KUMAR
2016-08-05 8:20 ` Minchan Kim [this message]
2016-08-05 14:47 ` PINTU KUMAR
2016-08-05 20:50 ` Pavel Machek
2016-08-10 13:26 ` PINTU KUMAR
2016-08-11 4:53 ` vinayak menon
2016-08-11 5:45 ` PINTU KUMAR
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