todo: Update

Signed-off-by: SeongJae Park <sj@kernel.org>
diff --git a/todo b/todo
index 9e45eeb..62be277 100644
--- a/todo
+++ b/todo
@@ -29,15 +29,20 @@
 Planning / Considering
 ----------------------
 
+- Access/Contiguity-aware Memory Auto-scaling
+  - https://lore.kernel.org/damon/20231112195114.61474-1-sj@kernel.org/
+- write-only monitoring
 - Documentation cleanup: Move more conceptual technical detail to design
 - Documentation cleanup: Make link from design to API, usage
+- DAMON sysfs interface refactoring
+  - Make the dirty callback based implementation simple
+    - Have a purpose-driven callback?
+  - Move scheme update to core logic
 - Selftests: Test DAMON online tuning
 - Selftests: Test DAMOS online tuning
 - Selftests: Test DAMOS filter
 - Selftests: Test DAMOS quota goals
 - Selftests: Test DAMOS tried_regions,bytes
-- Access/Contiguity-aware Memory Auto-scaling
-  - https://lore.kernel.org/damon/20231112195114.61474-1-sj@kernel.org/
 - Make 'age' counted by sample_interval rather than aggregation interval
 - CPU time quota for DAMON monitirng
 - monitoring part CPU usage statistics
@@ -59,7 +64,6 @@
 - let kdamond name be user-defined
 - let DAMON modules share one kdamond
 - unify DAMON modules
-- write-only monitoring
   - There is a patch doing the work already:
     https://lore.kernel.org/lkml/20220203131237.298090-1-pedrodemargomes@gmail.com/
   Need to wait until soft-dirty bugs are fixed, though.