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mm: Documentation: clarify where the mTHP stats live

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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.

Link: https://lore.kernel.org/20260811-khugepaged_pte_refactor-v4-7-ddac39d61c4a@linux.dev
Signed-off-by: Nico Pache (Red Hat) <nico.pache@linux.dev>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Suggested-by: Lorenzo Stoakes <ljs@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Acked-by: Pedro Falcato <pfalcato@suse.de> 
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Usama Arif <usama.arif@linux.dev>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Nico Pache (Red Hat) 2026-08-11 06:48:39 -06:00 committed by Andrew Morton
parent 27490db7ec
commit 2a0be246e3
1 changed files with 4 additions and 2 deletions
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6
Documentation/admin-guide/mm/transhuge.rst
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@ -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