DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 143F980478
Date: Fri, 25 Aug 2017 15:16:15 +0200
From: Jesper Dangaard Brouer <brouer@redhat.com>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: Kemi Wang <kemi.wang@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@suse.com>, Johannes Weiner <hannes@cmpxchg.org>,
        Christopher Lameter <cl@linux.com>, Dave <dave.hansen@linux.intel.com>,
        Andi Kleen <andi.kleen@intel.com>, Ying Huang <ying.huang@intel.com>,
        Aaron Lu <aaron.lu@intel.com>, Tim Chen <tim.c.chen@intel.com>,
        Linux MM <linux-mm@kvack.org>,
        Linux Kernel <linux-kernel@vger.kernel.org>, brouer@redhat.com
Subject: Re: [PATCH v2 0/3] Separate NUMA statistics from zone statistics
Message-ID: <20170825151615.4eb04cf4@redhat.com>
In-Reply-To: <20170825080437.wyikqunw6mtj22hu@techsingularity.net>
References: <1503568801-21305-1-git-send-email-kemi.wang@intel.com>
        <20170825080437.wyikqunw6mtj22hu@techsingularity.net>
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On Fri, 25 Aug 2017 09:04:37 +0100
Mel Gorman <mgorman@techsingularity.net> wrote:

> 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@techsingularity.net>
> 

I'm very happy to see these issues being worked on, from our MM-summit
interactions. I would like to provide/have a:

Reported-by: Jesper Dangaard Brouer <brouer@redhat.com>

As I'm not sure an acked-by from me have any value/merit here ;-)
-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer