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zmalloc_get_private_dirty() function added (Linux only).

For non Linux systmes it just returns 0.

This function is useful to estimate copy-on-write because of childs
saving stuff on disk.
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commit 3bfeb9c1a7044cd96c1bd77677dfe8b575c73c5f 1 parent af0b220
@antirez authored
Showing with 26 additions and 0 deletions.
  1. +25 −0 src/zmalloc.c
  2. +1 −0  src/zmalloc.h
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25 src/zmalloc.c
@@ -324,3 +324,28 @@ size_t zmalloc_get_rss(void) {
float zmalloc_get_fragmentation_ratio(void) {
return (float)zmalloc_get_rss()/zmalloc_used_memory();
}
+
+#if defined(HAVE_PROCFS)
+size_t zmalloc_get_private_dirty(void) {
+ char line[1024];
+ size_t pd = 0;
+ FILE *fp = fopen("/proc/self/smaps","r");
+
+ if (!fp) return 0;
+ while(fgets(line,sizeof(line),fp) != NULL) {
+ if (strncmp(line,"Private_Dirty:",14) == 0) {
+ char *p = strchr(line,'k');
+ if (p) {
+ *p = '\0';
+ pd += strtol(line+14,NULL,10) * 1024;
+ }
+ }
+ }
+ fclose(fp);
+ return pd;
+}
+#else
+size_t zmalloc_get_private_dirty(void) {
+ return 0;
+}
+#endif
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1  src/zmalloc.h
@@ -75,6 +75,7 @@ void zmalloc_enable_thread_safeness(void);
void zmalloc_set_oom_handler(void (*oom_handler)(size_t));
float zmalloc_get_fragmentation_ratio(void);
size_t zmalloc_get_rss(void);
+size_t zmalloc_get_private_dirty(void);
void zlibc_free(void *ptr);
#ifndef HAVE_MALLOC_SIZE
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