osd: cache tiering: fix the atime logic of the eviction

Reported-by: Xinze Chi <xmdxcxz@gmail.com>
Signed-off-by: Zhiqiang Wang <zhiqiang.wang@intel.com>
(cherry picked from commit 622c5ac)

src/osd/ReplicatedPG.cc

@@ -11409,8 +11409,7 @@ bool ReplicatedPG::agent_maybe_evict(ObjectContextRef& obc)
 
     // FIXME: ignore temperature for now.
 
-    // KISS: if [lower,upper] spans our target effort, evict it.
-    if (atime_lower >= agent_state->evict_effort)
+    if (1000000 - atime_upper >= agent_state->evict_effort)
       return false;
   }