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([2620:10d:c092:500::6:98ea]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-459e58400f5sm1048305e9.2.2025.08.05.05.09.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Aug 2025 05:09:35 -0700 (PDT) Message-ID: <4cb3dbf4-87bb-4946-8e43-36dcb5d9fefe@gmail.com> Date: Tue, 5 Aug 2025 13:09:31 +0100 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 4/6] docs: transhuge: document process level THP controls To: David Hildenbrand , Andrew Morton , linux-mm@kvack.org Cc: linux-fsdevel@vger.kernel.org, corbet@lwn.net, rppt@kernel.org, surenb@google.com, mhocko@suse.com, hannes@cmpxchg.org, baohua@kernel.org, shakeel.butt@linux.dev, riel@surriel.com, ziy@nvidia.com, laoar.shao@gmail.com, dev.jain@arm.com, baolin.wang@linux.alibaba.com, npache@redhat.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, vbabka@suse.cz, jannh@google.com, Arnd Bergmann , sj@kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kernel-team@meta.com References: <20250804154317.1648084-1-usamaarif642@gmail.com> <20250804154317.1648084-5-usamaarif642@gmail.com> <7828753c-98fc-4f96-bf7c-0d94f3b99e4b@redhat.com> Content-Language: en-US From: Usama Arif In-Reply-To: <7828753c-98fc-4f96-bf7c-0d94f3b99e4b@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 05/08/2025 11:24, David Hildenbrand wrote: > On 04.08.25 17:40, Usama Arif wrote: >> This includes the PR_SET_THP_DISABLE/PR_GET_THP_DISABLE pair of >> prctl calls as well the newly introduced PR_THP_DISABLE_EXCEPT_ADVISED >> flag for the PR_SET_THP_DISABLE prctl call. >> >> Signed-off-by: Usama Arif >> --- >>   Documentation/admin-guide/mm/transhuge.rst | 38 ++++++++++++++++++++++ >>   1 file changed, 38 insertions(+) >> >> diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst >> index 370fba113460..a36a04394ff5 100644 >> --- a/Documentation/admin-guide/mm/transhuge.rst >> +++ b/Documentation/admin-guide/mm/transhuge.rst >> @@ -225,6 +225,44 @@ to "always" or "madvise"), and it'll be automatically shutdown when >>   PMD-sized THP is disabled (when both the per-size anon control and the >>   top-level control are "never") >>   +process THP controls >> +-------------------- >> + >> +A process can control its own THP behaviour using the ``PR_SET_THP_DISABLE`` >> +and ``PR_GET_THP_DISABLE`` pair of prctl(2) calls. These calls support the >> +following arguments:: >> + > > Not sure if we really want to talk about MMF_ internals. > Thanks! have changed it for the next revision according to your suggestions.