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

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Message-ID: <20250109114230.24203-1-nikhil.dhama@amd.com>
Date: Thu, 9 Jan 2025 17:12:29 +0530
From: Nikhil Dhama <nikhil.dhama@....com>
To: <akpm@...ux-foundation.org>
CC: <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>, Nikhil Dhama
	<nikhil.dhama@....com>
Subject: Re: [FIX PATCH] mm: pcp: fix pcp->free_count reduction on page allocation

> 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.