linux-kernel - Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on collapse

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]

Date: Fri, 2 Feb 2024 13:57:35 +0100
From: Michal Hocko <mhocko@...e.com>
To: Lance Yang <ioworker0@...il.com>
Cc: akpm@...ux-foundation.org, zokeefe@...gle.com, david@...hat.com,
	songmuchun@...edance.com, shy828301@...il.com, peterx@...hat.com,
	minchan@...nel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] mm/khugepaged: skip copying lazyfree pages on
 collapse

On Fri 02-02-24 20:52:48, Lance Yang wrote:
> On Fri, Feb 2, 2024 at 8:27 PM Michal Hocko <mhocko@...e.com> wrote:
> >
> > On Fri 02-02-24 19:18:31, Lance Yang wrote:
> > > IMO, since it's treated the same as pte_none,
> > > perhaps lazyfree pages shouldn't be copied to
> > > the new huge page.
> >
> > Why? The content of MADV_FREE page is valid until it is reclaimed.
> 
> IMO, if MADV_FREE pages are considered valid until
> reclaimed, treating them the same as pte_none might
> pose a conflict.

What kind of conflict?
-- 
Michal Hocko
SUSE Labs