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

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Message-ID: <CAA1CXcB-A9U8GEodPrm3QdndzB2MY7eZHnoojVYU5fi_DJBbcw@mail.gmail.com>
Date: Sun, 8 Jun 2025 13:50:27 -0600
From: Nico Pache <npache@...hat.com>
To: 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, baolin.wang@...ux.alibaba.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 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"

-- Nico
>
> >
> > -- Nico
> >
>