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

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Message-ID: <20170825151615.4eb04cf4@redhat.com>
Date:   Fri, 25 Aug 2017 15:16:15 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Kemi Wang <kemi.wang@...el.com>,
        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>,
        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>, brouer@...hat.com
Subject: Re: [PATCH v2 0/3] Separate NUMA statistics from zone statistics

On Fri, 25 Aug 2017 09:04:37 +0100
Mel Gorman <mgorman@...hsingularity.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@...hsingularity.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@...hat.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