linux-kernel - Re: [PATCH v3 4/6] docs: transhuge: document process level THP controls

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Message-ID: <4cb3dbf4-87bb-4946-8e43-36dcb5d9fefe@gmail.com>
Date: Tue, 5 Aug 2025 13:09:31 +0100
From: Usama Arif <usamaarif642@...il.com>
To: David Hildenbrand <david@...hat.com>,
 Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc: linux-fsdevel@...r.kernel.org, corbet@....net, rppt@...nel.org,
 surenb@...gle.com, mhocko@...e.com, hannes@...xchg.org, baohua@...nel.org,
 shakeel.butt@...ux.dev, riel@...riel.com, ziy@...dia.com,
 laoar.shao@...il.com, dev.jain@....com, baolin.wang@...ux.alibaba.com,
 npache@...hat.com, lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com,
 ryan.roberts@....com, vbabka@...e.cz, jannh@...gle.com,
 Arnd Bergmann <arnd@...db.de>, sj@...nel.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH v3 4/6] docs: transhuge: document process level THP
 controls



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 <usamaarif642@...il.com>
>> ---
>>   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.