From: SeongJae Park <sj@kernel.org>
To: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: SeongJae Park <sj@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@redhat.com>, Zi Yan <ziy@nvidia.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>,
Nico Pache <npache@redhat.com>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
linux-mm@kvack.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] docs: update THP documentation to clarify sysfs "never" setting
Date: Mon, 21 Jul 2025 09:27:31 -0700 [thread overview]
Message-ID: <20250721162731.9822-1-sj@kernel.org> (raw)
In-Reply-To: <20250721155530.75944-1-lorenzo.stoakes@oracle.com>
On Mon, 21 Jul 2025 16:55:30 +0100 Lorenzo Stoakes <lorenzo.stoakes@oracle.com> 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.
case?
>
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: SeongJae Park <sj@kernel.org>
Thanks,
SJ
[...]
next prev parent reply other threads:[~2025-07-21 16:27 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-21 15:55 [PATCH] docs: update THP documentation to clarify sysfs "never" setting Lorenzo Stoakes
2025-07-21 16:27 ` SeongJae Park [this message]
2025-07-22 1:13 ` Zi Yan
2025-07-22 1:30 ` Baolin Wang
2025-07-22 2:23 ` Barry Song
2025-07-22 2:33 ` Baolin Wang
2025-07-22 3:37 ` Barry Song
2025-07-22 5:29 ` Lorenzo Stoakes
2025-07-23 15:41 ` Lorenzo Stoakes
2025-07-22 5:24 ` Lorenzo Stoakes
2025-07-22 5:25 ` Lorenzo Stoakes
2025-07-22 5:34 ` Lorenzo Stoakes
2025-07-22 5:59 ` Baolin Wang
2025-07-22 8:19 ` Barry Song
2025-07-22 7:20 ` David Hildenbrand
2025-07-22 7:59 ` David Hildenbrand
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