lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Wed, 21 Feb 2024 17:27:55 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: akpm@...ux-foundation.org
Cc: muchun.song@...ux.dev,
	osalvador@...e.de,
	david@...hat.com,
	linmiaohe@...wei.com,
	naoya.horiguchi@....com,
	mhocko@...nel.org,
	baolin.wang@...ux.alibaba.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 3/3] docs: hugetlbpage.rst: add hugetlb migration description

Add some description of the hugetlb migration strategy.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 Documentation/admin-guide/mm/hugetlbpage.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/admin-guide/mm/hugetlbpage.rst b/Documentation/admin-guide/mm/hugetlbpage.rst
index e4d4b4a8dc97..68d7bc2165c9 100644
--- a/Documentation/admin-guide/mm/hugetlbpage.rst
+++ b/Documentation/admin-guide/mm/hugetlbpage.rst
@@ -376,6 +376,13 @@ Note that the number of overcommit and reserve pages remain global quantities,
 as we don't know until fault time, when the faulting task's mempolicy is
 applied, from which node the huge page allocation will be attempted.
 
+The hugetlb may be migrated between the per-node hugepages pool in the following
+scenarios: memory offline, memory failure, longterm pinning, syscalls(mbind,
+migrate_pages, move_pages), alloc_contig_range() and alloc_contig_pages(). Now
+only memory offline, memory failure and syscalls allow fallback to allocate a
+new hugetlb on a different node if the current node is unable to allocate during
+hugetlb migration, that means these 3 cases can break the per-node hugepages pool.
+
 .. _using_huge_pages:
 
 Using Huge Pages
-- 
2.39.3


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ