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Date: Mon, 9 Jan 2017 12:53:20 +0100
From: Robert Richter <robert.richter@cavium.com>
Subject: Re: [PATCH v3] arm64: mm: Fix NOMAP page initialization
Message-ID: <20170109115320.GI4930@rric.localdomain>
References: <20161216165437.21612-1-rrichter@cavium.com>
 <CAKv+Gu_SmTNguC=tSCwYOL2kx-DogLvSYRZc56eGP=JhdrUOsA@mail.gmail.com>
 <c74d6ec6-16ba-dccc-3b0d-a8bedcb46dc5@linaro.org>
 <cbbf14fd-a1cc-2463-ba67-acd6d61e9db1@linaro.org>
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Sender: owner-linux-mm@kvack.org
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To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Hanjun Guo <hanjun.guo@linaro.org>, Russell King <linux@armlinux.org.uk>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, David Daney <david.daney@cavium.com>, Mark Rutland <mark.rutland@arm.com>, James Morse <james.morse@arm.com>, Yisheng Xie <xieyisheng1@huawei.com>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>

On 06.01.17 08:37:25, Ard Biesheuvel wrote:
> Any comments on the performance impact (including boot time) ?

I did a kernel compile test and kernel mode time increases by about
2.2%. Though this is already significant, we need a more suitable mem
benchmark here for further testing.

For boot time I dont see significant changes.

-Robert


Boot times:

pfn_valid_within():
[   25.929134]
[   25.548830]
[   25.503225]

early_pfn_valid() v3:
[   25.773814]
[   25.548428]
[   25.765290]


Kernel compile times (3 runs each):

pfn_valid_within():

real    6m4.088s
user    372m57.607s
sys     16m55.158s

real    6m1.532s
user    372m48.453s
sys     16m50.370s

real    6m4.061s
user    373m18.753s
sys     16m57.027s


early_pfn_valid() v3:

real    6m3.261s
user    373m15.816s
sys     16m30.019s

real    6m2.980s
user    373m9.019s
sys     16m32.992s

real    6m2.574s
user    372m45.146s
sys     16m33.218s

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