linux-kernel - Re: [RFC PATCH] mm: don't promote exclusive file folios of dying processes

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Message-ID: <34c54df6-9a7c-475d-9b91-0f8acb118231@redhat.com>
Date: Wed, 16 Apr 2025 10:32:29 +0200
From: David Hildenbrand <david@...hat.com>
To: Barry Song <21cnbao@...il.com>, akpm@...ux-foundation.org,
 linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, Barry Song <v-songbaohua@...o.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Johannes Weiner <hannes@...xchg.org>, Matthew Wilcox <willy@...radead.org>,
 Oscar Salvador <osalvador@...e.de>, Ryan Roberts <ryan.roberts@....com>,
 Zi Yan <ziy@...dia.com>
Subject: Re: [RFC PATCH] mm: don't promote exclusive file folios of dying
 processes

On 12.04.25 10:58, Barry Song wrote:
> From: Barry Song <v-songbaohua@...o.com>
> 
> Promoting exclusive file folios of a dying process is unnecessary and
> harmful. For example, while Firefox is killed and LibreOffice is
> launched, activating Firefox's young file-backed folios makes it
> harder to reclaim memory that LibreOffice doesn't use at all.

Do we know when it is reasonable to promote any folios of a dying process?

Assume you restart Firefox, would it really matter to promote them when 
unmapping? New Firefox would fault-in / touch the ones it really needs 
immediately afterwards?

-- 
Cheers,

David / dhildenb