linux-kernel - Re: [PATCH] PR_*ET_THP_DISABLE.2const: document addition of PR_THP_DISABLE_EXCEPT

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Message-ID: <d45bfc2d-91da-4a70-90d2-4e0319c5241c@gmail.com>
Date: Mon, 1 Sep 2025 17:18:22 +0100
From: Usama Arif <usamaarif642@...il.com>
To: alx@...nel.org
Cc: linux-man@...r.kernel.org, david@...hat.com, lorenzo.stoakes@...cle.com,
 hannes@...xchg.org, baohua@...nel.org, shakeel.butt@...ux.dev,
 ziy@...dia.com, laoar.shao@...il.com, baolin.wang@...ux.alibaba.com,
 Liam.Howlett@...cle.com, linux-kernel@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH] PR_*ET_THP_DISABLE.2const: document addition of
 PR_THP_DISABLE_EXCEPT_ADVISED



On 01/09/2025 17:09, Usama Arif wrote:
> PR_THP_DISABLE_EXCEPT_ADVISED extended PR_SET_THP_DISABLE to only provide
> THPs when advised. IOW, it allows individual processes to opt-out of THP =
> "always" into THP = "madvise", without affecting other workloads on the
> system. The series has been merged in [1].
> 
> This patch documents the changes introduced due to the addition of
> PR_THP_DISABLE_EXCEPT_ADVISED flag:
> - PR_GET_THP_DISABLE returns a value whose bits indicate how THP-disable
>   is configured for the calling thread (with or without
>   PR_THP_DISABLE_EXCEPT_ADVISED).
> - PR_SET_THP_DISABLE now uses arg3 to specify whether to disable THP
>   completely for the process, or disable except madvise
>   (PR_THP_DISABLE_EXCEPT_ADVISED).
> 
> [1] https://lore.kernel.org/all/20250815135549.130506-1-usamaarif642@gmail.com/
> 
> Signed-off-by: Usama Arif <usamaarif642@...il.com>
> ---
>  man/man2/madvise.2                      |  4 +-
>  man/man2const/PR_GET_THP_DISABLE.2const | 18 ++++++---
>  man/man2const/PR_SET_THP_DISABLE.2const | 52 +++++++++++++++++++++----
>  3 files changed, 61 insertions(+), 13 deletions(-)
> 

I am not sure what the right time is to send the mandoc changes.
The patches have been merged into mm-new for more than 2 weeks.
We can still review it and I can resend if needed after the kernel release if that
is a more appropriate time?

Thanks!
Usama