linux-kernel - Re: [linus:master] [x86] 4817f70c25: stress-ng.mmapaddr.ops_per

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Message-ID: <0feb6506a91ea47b306ad50143bde375f462af63.camel@surriel.com>
Date: Fri, 31 Jan 2025 16:11:47 -0500
From: Rik van Riel <riel@...riel.com>
To: Qi Zheng <zhengqi.arch@...edance.com>
Cc: "Paul E. McKenney" <paulmck@...nel.org>, Matthew Wilcox	
 <willy@...radead.org>, Peter Zijlstra <peterz@...radead.org>, David
 Hildenbrand	 <david@...hat.com>, kernel test robot <oliver.sang@...el.com>,
 	oe-lkp@...ts.linux.dev, lkp@...el.com, linux-kernel@...r.kernel.org,
 Andrew Morton	 <akpm@...ux-foundation.org>, Dave Hansen
 <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>, Catalin
 Marinas <catalin.marinas@....com>, David Rientjes	 <rientjes@...gle.com>,
 Hugh Dickins <hughd@...gle.com>, Jann Horn	 <jannh@...gle.com>, Lorenzo
 Stoakes <lorenzo.stoakes@...cle.com>, Mel Gorman	 <mgorman@...e.de>, Muchun
 Song <muchun.song@...ux.dev>, Peter Xu	 <peterx@...hat.com>, Will Deacon
 <will@...nel.org>, Zach O'Keefe	 <zokeefe@...gle.com>, Dan Carpenter
 <dan.carpenter@...aro.org>, Frederic Weisbecker <frederic@...nel.org>,
 Neeraj Upadhyay <neeraj.upadhyay@...nel.org>
Subject: Re: [linus:master] [x86] 4817f70c25: stress-ng.mmapaddr.ops_per_sec
 63.0% regression

On Thu, 2025-01-30 at 01:33 +0800, Qi Zheng wrote:
> 
> stress-ng: info:  [671] stressor       bogo ops real time  usr time 
> sys 
> time   bogo ops/s   bogo ops/s
> stress-ng: info:  [671]                           (secs)    (secs) 
> (secs)   (real time) (usr+sys time)
> stress-ng: info:  [671] mmapaddr       19803127     60.01    235.20 
> 1146.76    330007.29     14329.74

How stable are these numbers?

It looks like the bogo ops/s number without the local_bh_disable
was 17233711, while the number is 19803127 after.

That looks like a 14% speedup.

This is not back to the 28440843 you had before 
MMU_GATHER_RCU_TABLE_FREE was enabled unconditionally,
but it does reduce the size of the regression
considerably, from 40% to 31%.

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