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

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Date:	Mon, 06 Jul 2015 18:45:50 +0100
From:	Daniel J Blueman <daniel@...ascale.com>
To:	Nathan Zimmer <nzimmer@....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

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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