linux-kernel - Re: [RFC PATCH 0/2] mm: improve folio refcount scalability

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Message-ID: <d9fe0fb8-2c83-4eeb-8513-853522909253@h-partners.com>
Date: Mon, 12 Jan 2026 17:32:10 +0300
From: Gladyshev Ilya <gladyshev.ilya1@...artners.com>
To: Kiryl Shutsemau <kirill@...temov.name>
CC: <guohanjun@...wei.com>, <wangkefeng.wang@...wei.com>,
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Subject: Re: [RFC PATCH 0/2] mm: improve folio refcount scalability

On 1/12/2026 2:49 PM, Kiryl Shutsemau wrote:
> On Mon, Jan 12, 2026 at 11:30:38AM +0300, Gladyshev Ilya wrote:
>> Gentle ping on this proposal
> 
> I generally like the idea, but I would like to hear from folks who
> actually understand serialization.
> 
> Also, do you have number for "a full CAS loop when the counter is
> approaching overflow" thing?
> 
I am not sure that overflow is a real problem because you need a very 
specific race condition over a long time to achieve it... But as a 
safeguard, everything lower than 2^31 - #max concurrent accesses (~#num 
cpu) should work, so let's say 2^30