[PATCH 2/3] tools/mm/thpmaps: fix missing order-1 file THP statistics

[Weilin Tong <tongweilin@linux.alibaba.com>]

File-backed THPs can have order 1, but the per-size counters are only
emitted for order 2 and above. Fully and contiguously mapped order-1
file THPs are therefore missing from the output.

Start emitting the per-size counters at order 1.

Fixes: 2444172cfde4 ("tools/mm: add thpmaps script to dump THP usage info")
Assisted-by: LLM
Signed-off-by: Weilin Tong <tongweilin@linux.alibaba.com>
---
 tools/mm/thpmaps | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/mm/thpmaps b/tools/mm/thpmaps
index d92aace005c1..30a8e915d677 100644
--- a/tools/mm/thpmaps
+++ b/tools/mm/thpmaps
@@ -295,7 +295,7 @@ def thp_parse(vma, kpageflags, ranges, indexes, vfns, pfns, anons, heads):
 
     def flatten_sub(type, subtype, stats):
         param = f"{type}-thp-pte-{subtype}-{{}}kB"
-        for od, nr in enumerate(stats[2:], 2):
+        for od, nr in enumerate(stats[1:], 1):
             rstats[param.format(odkb(od))] = {'type': type, 'value': nrkb(nr)}
 
     def flatten_type(type, stats):
-- 
2.43.7