Testing calloc performance

src/lxcstat.c

@@ -1,19 +1,20 @@
-#include <stdlib.h>
-#include <stdio.h>
-#include <errno.h>
-
 #include "lxcstat.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
 #include "parsing.h"
 
 int parseLxcConfigFile(lxcinfo *lxc, char *filedata) {
-  lxc->cpucount = 0;
-  lxc->memlimit = 0;
-
   char *temp = filedata;
   lxc->cpucount = findAndParseField(&temp, "cores");
   temp = filedata;
 
   lxc->memlimit = findAndParseField(&temp, "memory") * 1024 * 1024;
+  temp = filedata;
+
+  lxc->swaplimit = findAndParseField(&temp, "swap") * 1024 * 1024;
 
   char *ptr = strstr(filedata, "hostname:");
   ptr += strlen("hostname:");
@@ -48,7 +49,7 @@ lxcinfo *getLXCInfo(lxcinfo **lxcs, int lxcid) {
     lxc = lxc->next;
   }
 
-  lxc = malloc(sizeof(lxcinfo));
+  lxc = calloc(1, sizeof(lxcinfo));
   lxc->lxcid = lxcid;
 
   if (readLxcConfig(lxc, lxcid)) {

src/lxcstat.h

@@ -8,6 +8,7 @@ typedef struct _lxc_info {
   int lxcid;
   int cpucount;
   int memlimit;
+  int swaplimit;
   char hostname[128];
 } lxcinfo;
 

src/server.c

@@ -61,16 +61,8 @@ int parseStatFile(Process *proc, char *filedata) {
   proc->cpuTime += fast_str2ull(&location);
   location += 1;
 
-  // (16) cutime - %lu
-  proc->childCpuTime = fast_str2ull(&location);
-  location += 1;
-
-  // (17) cstime - %lu
-  proc->childCpuTime += fast_str2ull(&location);
-  location += 1;
-
-  // skip 18-19
-  skipRange(18, 20);
+  // skip 16-19
+  skipRange(16, 20);
 
   // (20) num_threads - %ld
   proc->nThreads = fast_str2ull(&location);
@@ -118,9 +110,7 @@ char *readProcesses(char *procdir) {
   char first;
   FILE *file;
 
-  Process *cur = malloc(sizeof(Process));
-  cur->prev = NULL;
-  cur->next = NULL;
+  Process *cur = calloc(1, sizeof(Process));
   Process *head = cur;
   lxcinfo *lxcs = NULL;
 
@@ -172,7 +162,7 @@ char *readProcesses(char *procdir) {
     }
 
   nextProcess:
-    cur->next = malloc(sizeof(Process));
+    cur->next = calloc(1, sizeof(Process));
     cur->next->prev = cur;
     cur = cur->next;
   }
@@ -211,6 +201,7 @@ char *readProcesses(char *procdir) {
     sprintf(buffer, "lxc=\"%d\",lxcname=\"%s\"", lxc->lxcid, lxc->hostname);
     ptr += sprintf(ptr, "lxc_cpu_core_count{%s} %u\n", buffer, lxc->cpucount);
     ptr += sprintf(ptr, "lxc_memory_limit_bytes{%s} %llu\n", buffer, lxc->memlimit);
+    ptr += sprintf(ptr, "lxc_swap_limit_bytes{%s} %llu\n", buffer, lxc->swaplimit);
     // free and proceed
     lxcinfo *prev = lxc;
     lxc = lxc->next;