osd: flush dirty data if cache_target_dirty_ratio = 0.0

ceph will not flush all dirty data to base tier, if
target_max_bytes and target_max_objects is large enough.

Signed-off-by: Ning Yao <yaoning@unitedstack.com>

diff --git a/src/osd/PrimaryLogPG.cc b/src/osd/PrimaryLogPG.cc
index 4454f6b90093f9b1b81c9c00e34921916d3d37b0..0e41a1feee9c5026a9e94c19417514da5c5c3576 100644 (file)
--- a/src/osd/PrimaryLogPG.cc
+++ b/src/osd/PrimaryLogPG.cc
@@ -14218,7 +14218,7 @@ bool PrimaryLogPG::agent_choose_mode(bool restart, OpRequestRef op)
 
   if (dirty_micro > flush_high_target) {
     flush_mode = TierAgentState::FLUSH_MODE_HIGH;
-  } else if (dirty_micro > flush_target) {
+  } else if (dirty_micro > flush_target || (!flush_target && num_dirty > 0)) {
     flush_mode = TierAgentState::FLUSH_MODE_LOW;
   }