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[3/3] docs: hugetlbpage.rst: add hugetlb migration description

Message ID 574e5bfbaa2b6930aad4a64e1c3da25c4ee5c9ee.1709041586.git.baolin.wang@linux.alibaba.com
State New
Headers
Series make the hugetlb migration strategy consistent |

Commit Message

Baolin Wang Feb. 27, 2024, 1:52 p.m. UTC 
  Add some description of the hugetlb migration strategy.

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

Patch

diff --git a/Documentation/admin-guide/mm/hugetlbpage.rst b/Documentation/admin-guide/mm/hugetlbpage.rst
index e4d4b4a8dc97..f34a0d798d5b 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 and move_pages), alloc_contig_range() and alloc_contig_pages().
+Now only memory offline, memory failure and syscalls allow fallbacking 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