[PATCH v3 7/7] mm: Documentation: clarify where the mTHP stats live
"Nico Pache (Red Hat)" <[email protected]> Tue, 04 Aug 2026 13:25:05 -0600
| Newsgroups | gmane.linux.documentation,gmane.linux.kernel.mm,gmane.linux.kernel |
|---|---|
| Message-ID | <[email protected]> |
The note about khugepaged counters references /proc/vmstat for the PMD case, but never mentions where the mTHPs stats can be found (i.e.: /sys/kernel/mm/transparent_hugepage/hugepages-<size>kB/stats/) Add a small addition to this section for clarity. Also fix a missing period while we are at it. Reviewed-by: Baolin Wang <[email protected]> Suggested-by: Lorenzo Stoakes <[email protected]> Acked-by: David Hildenbrand (Arm) <[email protected]> Signed-off-by: Nico Pache (Red Hat) <[email protected]> --- Documentation/admin-guide/mm/transhuge.rst | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst index 16f37135ed80..b187d618452f 100644 --- a/Documentation/admin-guide/mm/transhuge.rst +++ b/Documentation/admin-guide/mm/transhuge.rst @@ -224,7 +224,7 @@ khugepaged will be automatically started when any THP size is enabled (either of the per-size anon control or the top-level control are set to "always" or "madvise"), and it'll be automatically shutdown when all THP sizes are disabled (when both the per-size anon control and the -top-level control are "never") +top-level control are "never"). process THP controls -------------------- @@ -301,7 +301,9 @@ being replaced by a PMD mapping, or (2) physical pages replaced by one hugepage of various sizes (PMD-sized or mTHP). Each may happen independently, or together, depending on the type of memory and the failures that occur. As such, this value should be interpreted roughly as a sign of progress, -and counters in /proc/vmstat consulted for more accurate accounting):: +and counters in /proc/vmstat consulted for more accurate accounting. +Per-order mTHP collapse statistics are also available under +/sys/kernel/mm/transparent_hugepage/hugepages-<size>kB/stats/):: /sys/kernel/mm/transparent_hugepage/khugepaged/pages_collapsed -- 2.55.0