Docs/admin-guide/mm/damon/reclaim: document auto-tuning parameters

Update DAMON_RECLAIM usage document for the user/self feedback based
auto-tuning of the quota.

Link: https://lkml.kernel.org/r/20240219194431.159606-21-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Documentation/admin-guide/mm/damon/reclaim.rst

@@ -117,6 +117,33 @@ milliseconds.
 
 1 second by default.
 
+quota_mem_pressure_us
+---------------------
+
+Desired level of memory pressure-stall time in microseconds.
+
+While keeping the caps that set by other quotas, DAMON_RECLAIM automatically
+increases and decreases the effective level of the quota aiming this level of
+memory pressure is incurred.  System-wide ``some`` memory PSI in microseconds
+per quota reset interval (``quota_reset_interval_ms``) is collected and
+compared to this value to see if the aim is satisfied.  Value zero means
+disabling this auto-tuning feature.
+
+Disabled by default.
+
+quota_autotune_feedback
+-----------------------
+
+User-specifiable feedback for auto-tuning of the effective quota.
+
+While keeping the caps that set by other quotas, DAMON_RECLAIM automatically
+increases and decreases the effective level of the quota aiming receiving this
+feedback of value ``10,000`` from the user.  DAMON_RECLAIM assumes the feedback
+value and the quota are positively proportional.  Value zero means disabling
+this auto-tuning feature.
+
+Disabled by default.
+
 wmarks_interval
 ---------------