linux-kernel - Re: [PATCH] mm, memcg: Add memory.transparent_hugepage

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] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.21.2003241215580.34058@chino.kir.corp.google.com>
Date:   Tue, 24 Mar 2020 12:17:11 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
cc:     Hui Zhu <teawater@...il.com>, hannes@...xchg.org,
        mhocko@...nel.org, vdavydov.dev@...il.com,
        akpm@...ux-foundation.org, hughd@...gle.com,
        yang.shi@...ux.alibaba.com, dan.j.williams@...el.com,
        aneesh.kumar@...ux.ibm.com, sean.j.christopherson@...el.com,
        thellstrom@...are.com, guro@...com, shakeelb@...gle.com,
        chris@...isdown.name, tj@...nel.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, Hui Zhu <teawaterz@...ux.alibaba.com>
Subject: Re: [PATCH] mm, memcg: Add memory.transparent_hugepage_disabled

On Tue, 24 Mar 2020, Kirill A. Shutemov wrote:

> On Tue, Mar 24, 2020 at 06:31:56PM +0800, Hui Zhu wrote:
> > /sys/kernel/mm/transparent_hugepage/enabled is the only interface to
> > control if the application can use THP in system level.
> 
> No. We have prctl(PR_SET_THP_DISABLE) too.
> 

Yeah, I think this is the key point since this can be inherited across 
fork and thus you already have the ability to disable thp for a process 
where you cannot even modify the binary to do MADV_NOHUGEPAGE.