linux-kernel - Re: [PATCH 03/13] mm: add PG

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: <u5ug67m23arro2zlpr4c6sy3xivqpuvxosflfsdhed4ssjui3x@4br4puj5ckjs>
Date: Fri, 8 Nov 2024 21:25:30 +0200
From: "Kirill A. Shutemov" <kirill@...temov.name>
To: Jens Axboe <axboe@...nel.dk>
Cc: linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, hannes@...xchg.org, 
	clm@...a.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/13] mm: add PG_uncached page flag

On Fri, Nov 08, 2024 at 10:43:26AM -0700, Jens Axboe wrote:
> Add a page flag that file IO can use to indicate that the IO being done
> is uncached, as in it should not persist in the page cache after the IO
> has been completed.

Flag bits are precious resource. It would be nice to re-use an existing
bit if possible.

PG_reclaim description looks suspiciously close to what you want.
I wounder if it would be valid to re-define PG_reclaim behaviour to drop
the page after writeback instead of moving to the tail of inactive list.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov