Re: [PATCH v5 6/6] mm: shmem: add mTHP counters for anonymous shmem

[Baolin Wang <baolin.wang@linux.alibaba.com>]

On 2024/6/12 22:18, Lance Yang wrote:
> On Tue, Jun 11, 2024 at 6:11 PM Baolin Wang
> <baolin.wang@linux.alibaba.com> wrote:
>>
>> Add mTHP counters for anonymous shmem.
>>
>> Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
> 
> LGTM. Feel free to add:
> Reviewed-by: Lance Yang <ioworker0@gmail.com>

Thanks.

> 
> Just a friendly reminder: We also need to update the documentation
> for the counters in transhuge.rst.

Indeed.

Andrew, could you help to fold following changes into this patch? Thanks.

diff --git a/Documentation/admin-guide/mm/transhuge.rst 
b/Documentation/admin-guide/mm/transhuge.rst
index e7232b46fe14..8f6ffbfc4b16 100644
--- a/Documentation/admin-guide/mm/transhuge.rst
+++ b/Documentation/admin-guide/mm/transhuge.rst
@@ -501,6 +501,19 @@ swpout_fallback
         Usually because failed to allocate some continuous swap space
         for the huge page.

+file_alloc
+        is incremented every time a file huge page is successfully
+        allocated.
+
+file_fallback
+        is incremented if a file huge page is attempted to be allocated
+        but fails and instead falls back to using small pages.
+
+file_fallback_charge
+        is incremented if a file huge page cannot be charged and instead
+        falls back to using small pages even though the allocation was
+        successful.
+
  As the system ages, allocating huge pages may be expensive as the
  system uses memory compaction to copy data around memory to free a
  huge page for use. There are some counters in ``/proc/vmstat`` to help