linux-kernel - Re: [PATCH 0/2 v6] add ioctl/sysfs to donate file-backed pages

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 for Android: free password hash cracker in your pocket

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

Message-ID: <Z6JAcsAOCCWp-y66@google.com>
Date: Tue, 4 Feb 2025 16:29:38 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Matthew Wilcox <willy@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 0/2 v6] add ioctl/sysfs to donate file-backed pages

On 01/17, Jaegeuk Kim wrote:
> On 01/17, Matthew Wilcox wrote:
> > On Fri, Jan 17, 2025 at 06:48:55PM +0000, Jaegeuk Kim wrote:
> > > > I don't understand how this is different from MADV_COLD.  Please
> > > > explain.
> > > 
> > > MADV_COLD is a vma range, while this is a file range. So, it's more close to
> > > fadvise(POSIX_FADV_DONTNEED) which tries to reclaim the file-backed pages
> > > at the time when it's called. The idea is to keep the hints only, and try to
> > > reclaim all later when admin expects system memory pressure soon.
> > 
> > So you're saying you want POSIX_FADV_COLD?
> 
> Yeah, the intention looks similar like marking it cold and paging out later.

Kindly ping, for the feedback on the direction. If there's demand for something
generalized api, I'm happy to explore.