linux-kernel - Re: [PATCH 08/13] mm: meminit: Initialise remaining struct pages in parallel with kswapd

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Message-Id: <20150427154350.4d649694a56e5bbc519e1fb4@linux-foundation.org>
Date:	Mon, 27 Apr 2015 15:43:50 -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 08/13] mm: meminit: Initialise remaining struct pages in
 parallel with kswapd

On Thu, 23 Apr 2015 11:33:11 +0100 Mel Gorman <mgorman@...e.de> wrote:

> Only a subset of struct pages are initialised at the moment. When this patch
> is applied kswapd initialise the remaining struct pages in parallel. This
> should boot faster by spreading the work to multiple CPUs and initialising
> data that is local to the CPU.  The user-visible effect on large machines
> is that free memory will appear to rapidly increase early in the lifetime
> of the system until kswapd reports that all memory is initialised in the
> kernel log.  Once initialised there should be no other user-visibile effects.
> 
> ...
>
> +	pr_info("kswapd %d initialised deferred memory in %ums\n", nid,
> +					jiffies_to_msecs(jiffies - start));

It might be nice to tell people how much deferred memory kswapd
initialised.
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