Re: [PATCH] mm: meminit: Finish initialisation of struct pages before basic setup

[Nathan Zimmer]

Interesting, I found a small improvement in total clock time through the 
area.
I tweaked page_alloc_init_late have a timer, like the 
deferred_init_memmap, and this patch showed a small improvement.

Ok thanks for your help.


On 07/06/2015 12:45 PM, Daniel J Blueman wrote:
> Hi Nate,
>
> On Wed, Jun 24, 2015 at 11:50 PM, Nathan Zimmer <nzimmer@xxxxxxx> wrote:
> > My apologies for taking so long to get back to this.
> >
> > I think I did locate two potential sources of slowdown.
> > One is the set_cpus_allowed_ptr as I have noted previously.
> > However I only notice that on the very largest boxes.
> > I did cobble together a patch that seems to help.
> >
> > The other spot I suspect is the zone lock in free_one_page.
> > I haven't been able to give that much thought as of yet though.
> >
> > Daniel do you mind seeing if the attached patch helps out?
>
> Just got back from travel, so apologies for the delays.
>
> The patch doesn't mitigate the increasing initialisation time; summing 
> the per-node times for an accurate measure, there was a total of 
> 171.48s before the patch and 175.23s after. I double-checked and got 
> similar data.
>
> Thanks,
>  Daniel

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