linux-kernel - Re: [PATCH] mm: optimize find_zone_movable_pfns_for

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Message-Id: <20160809162919.266e58ca0c33896dcf417a02@linux-foundation.org>
Date:	Tue, 9 Aug 2016 16:29:19 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	zhongjiang <zhongjiang@...wei.com>
Cc:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: optimize find_zone_movable_pfns_for_nodes to avoid
 unnecessary loop.

On Fri, 5 Aug 2016 22:04:07 +0800 zhongjiang <zhongjiang@...wei.com> wrote:

> when required_kernelcore decrease to zero, we should exit the loop in time.
> because It will waste time to scan the remainder node.

The patch is rather ugly and it only affects __init code, so the only
benefit will be to boot time.

Do we have any timing measurements which would justify changing this code?