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
Date: Fri, 25 Aug 2017 15:16:15 +0200 [thread overview]
Message-ID: <20170825151615.4eb04cf4@redhat.com> (raw)
In-Reply-To: <20170825080437.wyikqunw6mtj22hu@techsingularity.net>
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
--
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WARNING: multiple messages have this Message-ID (diff)
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
Date: Fri, 25 Aug 2017 15:16:15 +0200 [thread overview]
Message-ID: <20170825151615.4eb04cf4@redhat.com> (raw)
In-Reply-To: <20170825080437.wyikqunw6mtj22hu@techsingularity.net>
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
next prev parent reply other threads:[~2017-08-25 13:16 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-24 9:59 [PATCH v2 0/3] Separate NUMA statistics from zone statistics Kemi Wang
2017-08-24 9:59 ` Kemi Wang
2017-08-24 9:59 ` [PATCH v2 1/3] mm: Change the call sites of numa statistics items Kemi Wang
2017-08-24 9:59 ` Kemi Wang
2017-08-24 10:00 ` [PATCH v2 2/3] mm: Update NUMA counter threshold size Kemi Wang
2017-08-24 10:00 ` Kemi Wang
2017-08-24 10:00 ` [PATCH v2 3/3] mm: Consider the number in local CPUs when *reads* NUMA stats Kemi Wang
2017-08-24 10:00 ` Kemi Wang
2017-08-25 8:04 ` [PATCH v2 0/3] Separate NUMA statistics from zone statistics Mel Gorman
2017-08-25 8:04 ` Mel Gorman
2017-08-25 13:16 ` Jesper Dangaard Brouer [this message]
2017-08-25 13:16 ` Jesper Dangaard Brouer
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