linux-kernel - Re: [PATCH v4 2/3] mm/free_pcppages_bulk: do not hold lock when picking pages to free

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Date:   Fri, 2 Mar 2018 13:25:35 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Aaron Lu <aaron.lu@...el.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Huang Ying <ying.huang@...el.com>,
        Kemi Wang <kemi.wang@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Matthew Wilcox <willy@...radead.org>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v4 2/3] mm/free_pcppages_bulk: do not hold lock when
 picking pages to free

On 03/02/2018 01:23 PM, Andrew Morton wrote:
>> On my Sandybridge desktop, with will-it-scale/page_fault1/single process
>> run to emulate uniprocessor system, the score is(average of 3 runs):
>>
>> base(patch 1/3):	649710 
>> this patch:		653554 +0.6%
> Does that mean we got faster or slower?

Faster.  The unit of measurement here is iterations through a loop.
More iterations are better.