linux-kernel - Re: [PATCH v2 0/3] Separate NUMA statistics from zone statistics

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Message-ID: <20170825080437.wyikqunw6mtj22hu@techsingularity.net>
Date:   Fri, 25 Aug 2017 09:04:37 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Kemi Wang <kemi.wang@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Christopher Lameter <cl@...ux.com>,
        Dave <dave.hansen@...ux.intel.com>,
        Andi Kleen <andi.kleen@...el.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Ying Huang <ying.huang@...el.com>,
        Aaron Lu <aaron.lu@...el.com>, Tim Chen <tim.c.chen@...el.com>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/3] Separate NUMA statistics from zone statistics

On Thu, Aug 24, 2017 at 05:59:58PM +0800, Kemi Wang wrote:
> Each page allocation updates a set of per-zone statistics with a call to
> zone_statistics(). As discussed in 2017 MM summit, these are a substantial
> source of overhead in the page allocator and are very rarely consumed. This
> significant overhead in cache bouncing caused by zone counters (NUMA
> associated counters) update in parallel in multi-threaded page allocation
> (pointed out by Dave Hansen).
> 

For the series;

Acked-by: Mel Gorman <mgorman@...hsingularity.net>

-- 
Mel Gorman
SUSE Labs