On 13.01.17 09:19:04, Will Deacon wrote:

On Thu, Jan 12, 2017 at 07:58:25PM +0100, Robert Richter wrote:

quoted

On 12.01.17 16:05:36, Will Deacon wrote:

quoted

On Mon, Jan 09, 2017 at 12:53:20PM +0100, Robert Richter wrote:

quoted

quoted

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.

I guess I'm really asking what the standard deviation is if you *do* reboot
between builds, using the same kernel. It's hard to tell whether the numbers
are due to the patches, or just because of noise incurred by the way things
happen to initialise.

Ok, I am going to test this.

-Robert