support min_dynamic_memory in gs_guc

src/bin/gs_guc/cluster_guc.conf

@@ -401,6 +401,7 @@ memorypool_enable|bool|0,0|NULL|NULL|
 memorypool_size|int|131072,1073741823|kB|NULL|
 memory_detail_tracking|string|0,0|NULL|This parameter memory_detail_tracking only can be used in debug version. If it is set in the release version, it will lead the cluster does not work properly. Therefore, before making the settings, please make sure that the cluster version is debug.|
 memory_tracking_mode|enum|none,normal,executor,fullexec|NULL|NULL|
+min_dynamic_memory|int|-1,2147483647|NULL|NULL|
 minimum_pool_size|int|1,65535|NULL|NULL|
 modify_initial_password|bool|0,0|NULL|NULL|
 most_available_sync|bool|0,0|NULL|NULL|

src/common/backend/utils/misc/guc.cpp

@@ -4018,7 +4018,7 @@ static void InitConfigureNamesInt()
             gettext_noop("Sets the min number of dynamic memory hold by the process."),
             NULL,
             GUC_UNIT_KB},
-            &g_instance.attr.attr_memory.min_dynamic_memory,
+            &u_sess->attr.attr_memory.min_dynamic_memory,
             -1,
             -1,
             INT_MAX,

src/common/backend/utils/mmgr/memprot.cpp

@@ -602,7 +602,7 @@ static bool memTracker_ReserveMemChunks(int32 numChunksToReserve, bool needProte
     /* Query memory quota is exhausted. Reset the counter then return false. */
     if (MemoryIsNotEnough(total, *maxSize, needProtect)) {
         gs_atomic_add_32(currSize, -numChunksToReserve);
-        if (g_instance.attr.attr_memory.min_dynamic_memory >= 0) {
+        if (u_sess && u_sess->attr.attr_memory.min_dynamic_memory >= 0) {
             int current = pg_atomic_add_fetch_u32(&g_instance.exec_cxt.oomTimes, 1);
             if (current == 1) {
                 g_instance.exec_cxt.firstTime = GetCurrentTimestamp();
@@ -610,7 +610,7 @@ static bool memTracker_ReserveMemChunks(int32 numChunksToReserve, bool needProte
             if (current == OOM_TIME_THRESHOLD) {
                 if (!TimestampDifferenceExceeds(g_instance.exec_cxt.firstTime, GetCurrentTimestamp(),
                     OOM_TIME_INTERVAL_MSEC)) {
-                    CleanConnectionByMemory(g_instance.attr.attr_memory.min_dynamic_memory);
+                    CleanConnectionByMemory(u_sess->attr.attr_memory.min_dynamic_memory);
                 }
 		g_instance.exec_cxt.oomTimes = 0;
             }

src/include/knl/knl_guc/knl_instance_attr_memory.h

@@ -45,7 +45,6 @@ typedef struct knl_instance_attr_memory {
     bool enable_memory_limit;
     int memorypool_size;
     int max_process_memory;
-    int min_dynamic_memory;
     int local_syscache_threshold;
 } knl_instance_attr_memory;
 

src/include/knl/knl_guc/knl_session_attr_memory.h

@@ -50,6 +50,7 @@ typedef struct knl_session_attr_memory {
     char* memory_detail_tracking;
     char* uncontrolled_memory_context;
     int memory_tracking_mode;
+    int min_dynamic_memory;
 } knl_session_attr_memory;
 
 #endif /* SRC_INCLUDE_KNL_KNL_SESSION_ATTR_MEMORY_H_ */