linux-kernel - Re: [RFC v2 0/5] mm: introduce THP deferred setting

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: <CAA1CXcAK8tMVhWJLO9OrkyBpA6ZdPv7f99igBphLhLxVM5zJxA@mail.gmail.com>
Date: Mon, 17 Feb 2025 12:23:45 -0700
From: Nico Pache <npache@...hat.com>
To: Usama Arif <usamaarif642@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, linux-mm@...ck.org, ryan.roberts@....com, 
	anshuman.khandual@....com, catalin.marinas@....com, cl@...two.org, 
	vbabka@...e.cz, mhocko@...e.com, apopple@...dia.com, 
	dave.hansen@...ux.intel.com, will@...nel.org, baohua@...nel.org, jack@...e.cz, 
	srivatsa@...il.mit.edu, haowenchao22@...il.com, hughd@...gle.com, 
	aneesh.kumar@...nel.org, yang@...amperecomputing.com, peterx@...hat.com, 
	ioworker0@...il.com, wangkefeng.wang@...wei.com, ziy@...dia.com, 
	jglisse@...gle.com, surenb@...gle.com, vishal.moola@...il.com, 
	zokeefe@...gle.com, zhengqi.arch@...edance.com, jhubbard@...dia.com, 
	21cnbao@...il.com, willy@...radead.org, kirill.shutemov@...ux.intel.com, 
	david@...hat.com, aarcange@...hat.com, raquini@...hat.com, dev.jain@....com, 
	sunnanyong@...wei.com, audra@...hat.com, akpm@...ux-foundation.org, 
	rostedt@...dmis.org, mathieu.desnoyers@...icios.com, tiwai@...e.de, 
	baolin.wang@...ux.alibaba.com, corbet@....net, shuah@...nel.org
Subject: Re: [RFC v2 0/5] mm: introduce THP deferred setting

On Mon, Feb 17, 2025 at 7:54 AM Usama Arif <usamaarif642@...il.com> wrote:
>
>
>
> On 11/02/2025 00:40, Nico Pache wrote:
> > This series is a follow-up to [1], which adds mTHP support to khugepaged.
> > mTHP khugepaged support was necessary for the global="defer" and
> > mTHP="inherit" case (and others) to make sense.
> >
>
> Hi Nico,
>
> Thanks for the patches!
Hi Usama,

Thank you for the review!

>
> Why is mTHP khugepaged a prerequisite for THP=defer?
> THP=defer applies to PMD hugepages as well, so they should be independent.

Its not a hard prerequisite, but I explained it a little here:
https://lore.kernel.org/lkml/CAA1CXcBPt4jHfH0Ggio5ghSYAQAXf08rO8R6b1faHzdjFf_Ajw@mail.gmail.com/

In general, the sysfs didnt really make sense without it, and given
mTHPs came along right when i was working on defer, I decided to add
it to mTHP too.

I worked on and tested these together so it felt right to sync up the
V2s for both of them.

Cheers,
-- Nico


>
>
>