diff --git a/sys/compat/linuxkpi/common/include/linux/mm.h b/sys/compat/linuxkpi/common/include/linux/mm.h
--- a/sys/compat/linuxkpi/common/include/linux/mm.h
+++ b/sys/compat/linuxkpi/common/include/linux/mm.h
@@ -144,9 +144,11 @@
 };
 
 struct sysinfo {
-	uint64_t totalram;
-	uint64_t totalhigh;
-	uint32_t mem_unit;
+	uint64_t totalram;	/* Total usable main memory size */
+	uint64_t freeram;	/* Available memory size */
+	uint64_t totalhigh;	/* Total high memory size */
+	uint64_t freehigh;	/* Available high memory size */
+	uint32_t mem_unit;	/* Memory unit size in bytes */
 };
 
 /*
diff --git a/sys/compat/linuxkpi/common/src/linux_page.c b/sys/compat/linuxkpi/common/src/linux_page.c
--- a/sys/compat/linuxkpi/common/src/linux_page.c
+++ b/sys/compat/linuxkpi/common/src/linux_page.c
@@ -79,7 +79,9 @@
 si_meminfo(struct sysinfo *si)
 {
 	si->totalram = physmem;
+	si->freeram = vm_free_count();
 	si->totalhigh = 0;
+	si->freehigh = 0;
 	si->mem_unit = PAGE_SIZE;
 }