crimson/os/seastore/segment_cleaner: delay reclaim until near full

It should be generically better to delay reclaim as much as possible, so
that:
* unalive/unavailable can higher to reduce reclaim efforts;
* less conflicts between mutate and reclaim transactions;

Signed-off-by: Yingxin Cheng <yingxin.cheng@intel.com>

diff --git a/src/crimson/os/seastore/segment_cleaner.h b/src/crimson/os/seastore/segment_cleaner.h
index f244f2689db95d599bd011cbc3255f0945ebd1f9..e7a41d549865ddb3d63560549794c353d6d4fe38 100644 (file)
--- a/src/crimson/os/seastore/segment_cleaner.h
+++ b/src/crimson/os/seastore/segment_cleaner.h
@@ -516,10 +516,10 @@ public:
          12,   // target_journal_segments
          16,   // max_journal_segments
          2,    // target_backref_inflight_segments
-         .9,   // available_ratio_gc_max
-         .2,   // available_ratio_hard_limit
-         .8,   // reclaim_ratio_hard_limit
-         .6,   // reclaim_ratio_gc_threshold
+         .1,   // available_ratio_gc_max
+         .05,  // available_ratio_hard_limit
+         .9,   // reclaim_ratio_hard_limit
+         .1,   // reclaim_ratio_gc_threshold
          1<<20,// reclaim_bytes_per_cycle
          1<<17,// rewrite_dirty_bytes_per_cycle
          1<<24 // rewrite_backref_bytes_per_cycle