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

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Date:	Thu, 9 Jul 2015 12:49:05 -0500
From:	Nathan Zimmer <nzimmer@....com>
To:	Daniel J Blueman <daniel@...ascale.com>
CC:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Waiman Long <waiman.long@...com>,
	Dave Hansen <dave.hansen@...el.com>,
	Scott Norton <scott.norton@...com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Steffen Persvold <sp@...ascale.com>
Subject: Re: [PATCH] mm: meminit: Finish initialisation of struct pages before
 basic setup

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@....com> 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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