linux-kernel - Re: [PATCH 10/13] x86: mm: Enable deferred struct page initialisation on x86-64

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Message-Id: <20150422164500.121a355e6b578243cb3650e3@linux-foundation.org>
Date:	Wed, 22 Apr 2015 16:45:00 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Linux-MM <linux-mm@...ck.org>, Nathan Zimmer <nzimmer@....com>,
	Dave Hansen <dave.hansen@...el.com>,
	Waiman Long <waiman.long@...com>,
	Scott Norton <scott.norton@...com>,
	Daniel J Blueman <daniel@...ascale.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/13] x86: mm: Enable deferred struct page
 initialisation on x86-64

On Wed, 22 Apr 2015 18:07:50 +0100 Mel Gorman <mgorman@...e.de> wrote:

> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -32,6 +32,7 @@ config X86
>  	select HAVE_UNSTABLE_SCHED_CLOCK
>  	select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
>  	select ARCH_SUPPORTS_INT128 if X86_64
> +	select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT if X86_64 && NUMA

Put this in the "config X86_64" section and skip the "X86_64 &&"?

Can we omit the whole defer_meminit= thing and permanently enable the
feature?  That's simpler, provides better test coverage and is, we
hope, faster.

And can this be used on non-NUMA?  Presumably that won't speed things
up any if we're bandwidth limited but again it's simpler and provides
better coverage.
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