linux-kernel - Re: [PATCH 7/9] mm: delete NR_PAGES_SCANNED and pgdat

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Message-ID: <078201d29305$e98da760$bca8f620$@alibaba-inc.com>
Date:   Thu, 02 Mar 2017 11:34:34 +0800
From:   "Hillf Danton" <hillf.zj@...baba-inc.com>
To:     "'Johannes Weiner'" <hannes@...xchg.org>,
        "'Andrew Morton'" <akpm@...ux-foundation.org>
Cc:     "'Jia He'" <hejianet@...il.com>, "'Michal Hocko'" <mhocko@...e.cz>,
        "'Mel Gorman'" <mgorman@...e.de>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <kernel-team@...com>
Subject: Re: [PATCH 7/9] mm: delete NR_PAGES_SCANNED and pgdat_reclaimable()

On March 01, 2017 5:40 AM Johannes Weiner wrote: 
> 
> NR_PAGES_SCANNED counts number of pages scanned since the last page
> free event in the allocator. This was used primarily to measure the
> reclaimability of zones and nodes, and determine when reclaim should
> give up on them. In that role, it has been replaced in the preceeding
> patches by a different mechanism.
> 
> Being implemented as an efficient vmstat counter, it was automatically
> exported to userspace as well. It's however unlikely that anyone
> outside the kernel is using this counter in any meaningful way.
> 
> Remove the counter and the unused pgdat_reclaimable().
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> ---
Acked-by: Hillf Danton <hillf.zj@...baba-inc.com>