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Shutemov" cc: Hui Zhu , hannes@cmpxchg.org, mhocko@kernel.org, vdavydov.dev@gmail.com, akpm@linux-foundation.org, hughd@google.com, yang.shi@linux.alibaba.com, dan.j.williams@intel.com, aneesh.kumar@linux.ibm.com, sean.j.christopherson@intel.com, thellstrom@vmware.com, guro@fb.com, shakeelb@google.com, chris@chrisdown.name, tj@kernel.org, tglx@linutronix.de, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, Hui Zhu Subject: Re: [PATCH] mm, memcg: Add memory.transparent_hugepage_disabled In-Reply-To: <20200324121758.paxxthsi2f4hngfa@box> Message-ID: References: <1585045916-27339-1-git-send-email-teawater@gmail.com> <20200324121758.paxxthsi2f4hngfa@box> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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.