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Date: Thu, 21 Dec 2017 09:39:01 +0800 From: kemi <kemi.wang@...el.com> To: Christopher Lameter <cl@...ux.com> Cc: Michal Hocko <mhocko@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...hsingularity.net>, Johannes Weiner <hannes@...xchg.org>, YASUAKI ISHIMATSU <yasu.isimatu@...il.com>, Andrey Ryabinin <aryabinin@...tuozzo.com>, Nikolay Borisov <nborisov@...e.com>, Pavel Tatashin <pasha.tatashin@...cle.com>, David Rientjes <rientjes@...gle.com>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Dave <dave.hansen@...ux.intel.com>, Andi Kleen <andi.kleen@...el.com>, Tim Chen <tim.c.chen@...el.com>, Jesper Dangaard Brouer <brouer@...hat.com>, Ying Huang <ying.huang@...el.com>, Aaron Lu <aaron.lu@...el.com>, Aubrey Li <aubrey.li@...el.com>, Linux MM <linux-mm@...ck.org>, Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v2 4/5] mm: use node_page_state_snapshot to avoid deviation On 2017年12月20日 23:58, Christopher Lameter wrote: > On Wed, 20 Dec 2017, kemi wrote: > >>> You are making numastats special and I yet haven't heard any sounds >>> arguments for that. But that should be discussed in the respective >>> patch. >>> >> >> That is because we have much larger threshold size for NUMA counters, that means larger >> deviation. So, the number in local cpus may not be simply ignored. > > Some numbers showing the effect of these changes would be helpful. You can > probably create some in kernel synthetic tests to start with which would > allow you to see any significant effects of those changes. > > Then run the larger testsuites (f.e. those that Mel has published) and > benchmarks to figure out how behavior of real apps *may* change? > OK. I will do that when available. Let's just drop this patch in this series and consider this issue in another patch.
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