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

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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.