linux-kernel - Re: [RFC PATCH v4 0/6] Promotion of Unmapped Page Cache Folios.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f4131737-fe1b-46a9-acde-73d1e29cda98@linux.ibm.com>
Date: Sun, 13 Apr 2025 10:53:48 +0530
From: Donet Tom <donettom@...ux.ibm.com>
To: Matthew Wilcox <willy@...radead.org>, Gregory Price <gourry@...rry.net>
Cc: linux-mm@...ck.org, cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...a.com, akpm@...ux-foundation.org, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, hannes@...xchg.org, mhocko@...nel.org,
        roman.gushchin@...ux.dev, shakeel.butt@...ux.dev,
        Huang Ying <ying.huang@...ux.alibaba.com>,
        Keith Busch <kbusch@...a.com>, Feng Tang <feng.tang@...el.com>,
        Neha Gholkar <nehagholkar@...a.com>
Subject: Re: [RFC PATCH v4 0/6] Promotion of Unmapped Page Cache Folios.


On 4/12/25 5:19 AM, Matthew Wilcox wrote:
> On Fri, Apr 11, 2025 at 06:11:05PM -0400, Gregory Price wrote:
>> Unmapped page cache pages can be demoted to low-tier memory, but
> No.  Page cache should never be demoted to low-tier memory.
> NACK this patchset.

Hi Mathew,

I have one doubt. Under memory pressure, page cache allocations can
fall back to lower-tier memory, right? So later, if those page cache pages
become hot, shouldn't we promote them?

Thanks
Donet