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

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Message-ID: <57AA936E.3080503@huawei.com>
Date:	Wed, 10 Aug 2016 10:37:34 +0800
From:	zhong jiang <zhongjiang@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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 2016/8/10 7:29, Andrew Morton wrote:
> 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.
   yes
> Do we have any timing measurements which would justify changing this code?
  I am sorry for that.  That is a only theoretical analysis.
>