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Date: Thu, 12 Jan 2017 19:58:25 +0100
From: Robert Richter <robert.richter@cavium.com>
Subject: Re: [PATCH v3] arm64: mm: Fix NOMAP page initialization
Message-ID: <20170112185825.GE5020@rric.localdomain>
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To: Will Deacon <will.deacon@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>, Hanjun Guo <hanjun.guo@linaro.org>, Russell King <linux@armlinux.org.uk>, Catalin Marinas <catalin.marinas@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 12.01.17 16:05:36, Will Deacon wrote:
> On Mon, Jan 09, 2017 at 12:53:20PM +0100, Robert Richter wrote:

> > 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
> 
> Did you reboot the machine between each build here, or only when changing
> kernel? If the latter, do you see variations in kernel build time by simply
> rebooting the same Image?

I built it in a loop on the shell, so no reboots between builds. Note
that I was building the kernel in /dev/shm to not access harddisks. I
think build times should be comparable then since there is no fs
caching.

-Robert

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