support to utility thread offloading

kernel/include/process.h

@@ -231,6 +231,10 @@ enum mpol_rebind_step {
 #define MPOL_F_MOF	(1 << 3) /* this policy wants migrate on fault */
 #define MPOL_F_MORON	(1 << 4) /* Migrate On pte_numa Reference On Node */
 
+#define SPAWN_TO_LOCAL 0
+#define SPAWN_TO_REMOTE 1
+#define SPAWNING_TO_REMOTE 1001
+
 #include <waitq.h>
 #include <futex.h>
 
@@ -667,6 +671,11 @@ struct thread {
 
 	/* Syscall offload wait queue head */
 	struct waitq scd_wq;
+
+	int thread_offloaded;
+	int mod_clone;
+	struct uti_attr *mod_clone_arg;
+	int parent_cpuid;
 };
 
 #define VM_RANGE_CACHE_SIZE	4

kernel/include/syscall.h

@@ -517,4 +517,34 @@ struct perf_ctrl_desc {
 		};
 	};
 };
+
+#define UTI_FLAG_NUMA_SET (1ULL<<1) /* Indicates NUMA_SET is specified */
+
+#define UTI_FLAG_SAME_NUMA_DOMAIN (1ULL<<2)
+#define UTI_FLAG_DIFFERENT_NUMA_DOMAIN (1ULL<<3)
+
+#define UTI_FLAG_SAME_L1 (1ULL<<4)
+#define UTI_FLAG_SAME_L2 (1ULL<<5)
+#define UTI_FLAG_SAME_L3 (1ULL<<6)
+
+#define UTI_FLAG_DIFFERENT_L1 (1ULL<<7)
+#define UTI_FLAG_DIFFERENT_L2 (1ULL<<8)
+#define UTI_FLAG_DIFFERENT_L3 (1ULL<<9)
+
+#define UTI_FLAG_EXCLUSIVE_CPU (1ULL<<10)
+#define UTI_FLAG_CPU_INTENSIVE (1ULL<<11)
+#define UTI_FLAG_HIGH_PRIORITY (1ULL<<12)
+#define UTI_FLAG_NON_COOPERATIVE (1ULL<<13)
+
+/* Linux default value is used */
+#define UTI_MAX_NUMA_DOMAINS (1024)
+
+typedef struct uti_attr {
+	/* UTI_CPU_SET environmental variable is used to denote the preferred
+	   location of utility thread */
+	uint64_t numa_set[(UTI_MAX_NUMA_DOMAINS + sizeof(uint64_t) * 8 - 1) /
+	                   (sizeof(uint64_t) * 8)];
+	uint64_t flags; /* Representing location and behavior hints by bitmap */
+} uti_attr_t;
+
 #endif