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Message-ID: <64b5b420-4c2a-423e-825b-b2c309274d71@redhat.com>
Date: Tue, 22 Jul 2025 09:59:09 +0200
From: David Hildenbrand <david@...hat.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: Zi Yan <ziy@...dia.com>, Baolin Wang <baolin.wang@...ux.alibaba.com>,
"Liam R . Howlett" <Liam.Howlett@...cle.com>, Nico Pache
<npache@...hat.com>, Ryan Roberts <ryan.roberts@....com>,
Dev Jain <dev.jain@....com>, Barry Song <baohua@...nel.org>,
Jonathan Corbet <corbet@....net>, linux-mm@...ck.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] docs: update THP documentation to clarify sysfs "never"
setting
On 22.07.25 09:20, David Hildenbrand wrote:
> On 21.07.25 17:55, Lorenzo Stoakes wrote:
>> Rather confusingly, setting all Transparent Huge Page sysfs settings to
>> "never" does not in fact result in THP being globally disabled.
>>
>> Rather, it results in khugepaged being disabled, but one can still obtain
>> THP pages using madvise(..., MADV_COLLAPSE).
>>
>> This is something that has remained poorly documented for some time, and it
>> is likely the received wisdom of most users of THP that never does, in
>> fact, mean never.
>>
>> It is therefore important to highlight, very clearly, that this is not the
>> ase.
>>
>> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
>> ---
>
> Can we also somehow tone down or clarify the "entirely disabled"?
Ah, missed that you touched that already.
Acked-by: David Hildenbrand <david@...hat.com>
--
Cheers,
David / dhildenb
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