linux-kernel - Re: [FIX PATCH] mm: pcp: fix pcp->free

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Message-ID: <87wmew72vm.fsf@DESKTOP-5N7EMDA>
Date: Wed, 15 Jan 2025 19:06:21 +0800
From: "Huang, Ying" <ying.huang@...ux.alibaba.com>
To: Nikhil Dhama <nikhil.dhama@....com>
Cc: <akpm@...ux-foundation.org>,  <raghavendra.kodsarathimmappa@....com>,
  <bharata@....com>,  <huang.ying.caritas@...il.com>,
  <linux-mm@...ck.org>,  <linux-kernel@...r.kernel.org>,
  <subramaniam.kv@....com>,  <santosh.shukla@....com>,  <shivankg@....com>
Subject: Re: [FIX PATCH] mm: pcp: fix pcp->free_count reduction on page
 allocation

Nikhil Dhama <nikhil.dhama@....com> writes:

>> The present division by two appears to be somewhat randomly chosen.
>> And as far as I can tell, this patch proposes replacing that with
>> another somewhat random adjustment.
>>
>> What's the actual design here?  What are we attempting to do and why,
>> and why is the proposed design superior to the present one?
>
> We are further analyzing both the designs and their impact on pcp list.
>
>
>> Nice, but might other workloads on other machines get slower?
>
> We are studying the impact of this on other network workloads like netperf, 
> and will post those results soon.

To tune this parameter, in addition to network workloads, other kinds of
workloads need be evaluated too.

---
Best Regards,
Huang, Ying