linux-kernel - Re: [PATCH RFC v2] mm: memory-tiering: Fix PGPROMOTE

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Message-ID: <a2a57ee3-949a-44d7-b564-3236ac9e3f8d@fujitsu.com>
Date: Wed, 25 Jun 2025 07:39:58 +0000
From: "Zhijian Li (Fujitsu)" <lizhijian@...itsu.com>
To: "Huang, Ying" <ying.huang@...ux.alibaba.com>
CC: "linux-mm@...ck.org" <linux-mm@...ck.org>, "akpm@...ux-foundation.org"
	<akpm@...ux-foundation.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "Yasunori Gotou (Fujitsu)"
	<y-goto@...itsu.com>, Ingo Molnar <mingo@...hat.com>, Peter Zijlstra
	<peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot
	<vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel
 Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
	"lkp@...el.com" <lkp@...el.com>
Subject: Re: [PATCH RFC v2] mm: memory-tiering: Fix PGPROMOTE_CANDIDATE
 accounting



On 25/06/2025 14:11, Huang, Ying wrote:
>> V2:
>> Fix compiling error # Reported by LKP
>>
>> As Ying suggested, we need to assess whether this change causes regression.
>> However, considering the stringent conditions this patch involves,
>> properly evaluating it may be challenging, as the outcomes depend on your
>> perspective. Much like in a zero-sum game, if someone benefits, another
>> might lose.
>>
>> If there are subsequent results, I will update them here.
> I understand that it's hard to identify all possible regressions.
> However, at least done some test to check some common use cases?
> 

Yes, I'm working on it. I'm currently using `pmbench` for testing,
the approach[1] you took when introducing the rate limit.

And, I also hope LKP can run tests concurrently.


[1] https://lore.kernel.org/all/20220713083954.34196-1-ying.huang@intel.com/t/#u