linux-kernel - Re: [PATCH v7 12/12] Documentation: mm: update the admin guide for mTHP collapse

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Message-ID: <4a2c359e-79d9-447b-a43e-164333d08319@linux.alibaba.com>
Date: Mon, 9 Jun 2025 11:06:42 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: Nico Pache <npache@...hat.com>, Dev Jain <dev.jain@....com>
Cc: linux-mm@...ck.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 david@...hat.com, ziy@...dia.com, lorenzo.stoakes@...cle.com,
 Liam.Howlett@...cle.com, ryan.roberts@....com, corbet@....net,
 rostedt@...dmis.org, mhiramat@...nel.org, mathieu.desnoyers@...icios.com,
 akpm@...ux-foundation.org, baohua@...nel.org, willy@...radead.org,
 peterx@...hat.com, wangkefeng.wang@...wei.com, usamaarif642@...il.com,
 sunnanyong@...wei.com, vishal.moola@...il.com,
 thomas.hellstrom@...ux.intel.com, yang@...amperecomputing.com,
 kirill.shutemov@...ux.intel.com, aarcange@...hat.com, raquini@...hat.com,
 anshuman.khandual@....com, catalin.marinas@....com, tiwai@...e.de,
 will@...nel.org, dave.hansen@...ux.intel.com, jack@...e.cz, cl@...two.org,
 jglisse@...gle.com, surenb@...gle.com, zokeefe@...gle.com,
 hannes@...xchg.org, rientjes@...gle.com, mhocko@...e.com,
 rdunlap@...radead.org, Bagas Sanjaya <bagasdotme@...il.com>
Subject: Re: [PATCH v7 12/12] Documentation: mm: update the admin guide for
 mTHP collapse



On 2025/6/9 03:50, Nico Pache wrote:
> On Sat, Jun 7, 2025 at 8:35 AM Dev Jain <dev.jain@....com> wrote:
>>
>>
>> On 07/06/25 6:27 pm, Nico Pache wrote:
>>> On Sat, Jun 7, 2025 at 12:45 AM Dev Jain <dev.jain@....com> wrote:
>>>>
>>>> On 15/05/25 8:52 am, Nico Pache wrote:
>>>>
>>>> Now that we can collapse to mTHPs lets update the admin guide to
>>>> reflect these changes and provide proper guidence on how to utilize it.
>>>>
>>>> Reviewed-by: Bagas Sanjaya <bagasdotme@...il.com>
>>>> Signed-off-by: Nico Pache <npache@...hat.com>
>>>> ---
>>>>    Documentation/admin-guide/mm/transhuge.rst | 14 +++++++++++++-
>>>>    1 file changed, 13 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst
>>>> index dff8d5985f0f..5c63fe51b3ad 100644
>>>> --- a/Documentation/admin-guide/mm/transhuge.rst
>>>> +++ b/Documentation/admin-guide/mm/transhuge.rst
>>>>
>>>>
>>>> We need to modify/remove the following paragraph:
>>>>
>>>> khugepaged currently only searches for opportunities to collapse to
>>>> PMD-sized THP and no attempt is made to collapse to other THP
>>>> sizes.
>>> On this version this is currently still true, but once I add Baolin's
>>> patch it will not be true. Thanks for the reminder :)
>>
>> You referenced Baolin's patch in the other email too, can you send the link,
>> or the patch?
> 
> He didn't send it to the mailing list, but rather off chain to all the
> recipients of this series. You should have it in your email look for
> 
> Subject: "mm: khugepaged: allow khugepaged to check all anonymous mTHP
> orders" and "mm: khugepaged: kick khugepaged for enabling
> none-PMD-sized mTHPs"

You can find them at the following link:
https://lore.kernel.org/all/ac9ed6d71b439611f9c94b3506a8ce975d4636e9.1748435162.git.baolin.wang@linux.alibaba.com/