Pre-map file mappings from /dev/shm (--mpol-shm-premap mcexec argument)

kernel/include/memobj.h

@@ -36,6 +36,7 @@ enum {
 	MF_ZEROFILL = 0x0010,
 	MF_REG_FILE = 0x1000,
 	MF_DEV_FILE = 0x2000,
+	MF_PREMAP   = 0x8000,
 	MF_HOST_RELEASED = 0x80000000,
 	MF_END
 };
@@ -49,6 +50,10 @@ struct memobj {
 	uint32_t status;
 	size_t size;
 	ihk_spinlock_t lock;
+
+	/* For pre-mapped memobjects */
+	void **pages;
+	int nr_pages;
 };
 
 typedef void memobj_release_func_t(struct memobj *obj);

kernel/include/syscall.h

@@ -163,6 +163,7 @@ typedef unsigned long __cpu_set_unit;
 #define MPOL_NO_HEAP              0x01
 #define MPOL_NO_STACK             0x02
 #define MPOL_NO_BSS               0x04
+#define MPOL_SHM_PREMAP           0x08
 
 struct program_load_desc {
 	int num_sections;