Merge pull request #6384 from devnexen/apple_smaps_impl

Getting region date per process in Darwin

src/zmalloc.c

@@ -427,7 +427,28 @@ size_t zmalloc_get_smap_bytes_by_field(char *field, long pid) {
     return bytes;
 }
 #else
+/* Get sum of the specified field from libproc api call.
+ * As there are per page value basis we need to convert
+ * them accordingly.
+ *
+ * Note that AnonHugePages is a no-op as THP feature
+ * is not supported in this platform
+ */
 size_t zmalloc_get_smap_bytes_by_field(char *field, long pid) {
+#if defined(__APPLE__)
+    struct proc_regioninfo pri;
+    if (proc_pidinfo(pid, PROC_PIDREGIONINFO, 0, &pri, PROC_PIDREGIONINFO_SIZE) ==
+	PROC_PIDREGIONINFO_SIZE) {
+	if (!strcmp(field, "Private_Dirty:")) {
+            return (size_t)pri.pri_pages_dirtied * 4096;
+	} else if (!strcmp(field, "Rss:")) {
+            return (size_t)pri.pri_pages_resident * 4096;
+	} else if (!strcmp(field, "AnonHugePages:")) {
+            return 0;
+	}
+    }
+    return 0;
+#endif
     ((void) field);
     ((void) pid);
     return 0;

src/zmalloc.h

@@ -57,6 +57,7 @@
 
 #elif defined(__APPLE__)
 #include <malloc/malloc.h>
+#include <libproc.h>
 #define HAVE_MALLOC_SIZE 1
 #define zmalloc_size(p) malloc_size(p)
 #endif