X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/399f2f401c6fc3d489e2e40ffc78638425e3a09e..b33ef40105391502d9e44443fd4e337c06396468:/src/zmalloc.c

diff --git a/src/zmalloc.c b/src/zmalloc.c
index 5c1b5e9a..544155e7 100644
--- a/src/zmalloc.c
+++ b/src/zmalloc.c
@@ -32,6 +32,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <pthread.h>
+
 #include "config.h"
 
 #if defined(__sun)
@@ -170,3 +171,69 @@ size_t zmalloc_used_memory(void) {
 void zmalloc_enable_thread_safeness(void) {
     zmalloc_thread_safe = 1;
 }
+
+/* Fragmentation = RSS / allocated-bytes */
+
+#if defined(HAVE_PROCFS)
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+float zmalloc_get_fragmentation_ratio(void) {
+    size_t allocated = zmalloc_used_memory();
+    int page = sysconf(_SC_PAGESIZE);
+    size_t rss;
+    char buf[4096];
+    char filename[256];
+    int fd, count;
+    char *p, *x;
+
+    snprintf(filename,256,"/proc/%d/stat",getpid());
+    if ((fd = open(filename,O_RDONLY)) == -1) return 0;
+    if (read(fd,buf,4096) <= 0) {
+        close(fd);
+        return 0;
+    }
+    close(fd);
+
+    p = buf;
+    count = 23; /* RSS is the 24th field in /proc/<pid>/stat */
+    while(p && count--) {
+        p = strchr(p,' ');
+        if (p) p++;
+    }
+    if (!p) return 0;
+    x = strchr(p,' ');
+    if (!x) return 0;
+    *x = '\0';
+
+    rss = strtoll(p,NULL,10);
+    rss *= page;
+    return (float)rss/allocated;
+}
+#elif defined(HAVE_TASKINFO)
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <mach/task.h>
+#include <mach/mach_init.h>
+
+float zmalloc_get_fragmentation_ratio(void) {
+    task_t task = MACH_PORT_NULL;
+    struct task_basic_info t_info;
+    mach_msg_type_number_t t_info_count = TASK_BASIC_INFO_COUNT;
+
+    if (task_for_pid(current_task(), getpid(), &task) != KERN_SUCCESS)
+        return 0;
+    task_info(task, TASK_BASIC_INFO, (task_info_t)&t_info, &t_info_count);
+
+    return (float)t_info.resident_size/zmalloc_used_memory();
+}
+#else
+float zmalloc_get_fragmentation_ratio(void) {
+    return 0;
+}
+#endif