optinal load_avg to fix

user/sysinfo.c

@@ -0,0 +1,21 @@
+#include "kernel/param.h"
+#include "kernel/types.h"
+#include "kernel/stat.h"
+#include "user/user.h"
+
+int main() {
+  struct sysinfo info;
+
+  if (sysinfo(&info) < 0) {
+    printf("sysinfo: failed to retrieve system information\n");
+    exit(1);
+  }
+
+  printf("System Information:\n");
+  printf("  Free Memory: %d bytes\n", info.freemem);
+  printf("  Number of Processes: %d\n", info.nproc);
+  printf("  Unused Process Slots: %d\n", info.unused_proc_num);
+  printf("  Load Average: %d\n", info.load_avg);
+
+  exit(0);
+}

user/trace.c

@@ -6,24 +6,19 @@ int
 main(int argc, char *argv[])
 {
   int i;
-  //存储待跟踪程序的名称和参数
   char *nargv[MAXARG];
 
-  //保证trace的参数不少于三个，并且跟踪的系统调用号在0-99之间
   if(argc < 3 || (argv[1][0] < '0' || argv[1][0] > '9')){
     fprintf(2, "Usage: %s mask command\n", argv[0]);
     exit(1);
   }
-  //调用trace系统调用，传入待跟踪系统调用号
   if (trace(atoi(argv[1])) < 0) {
     fprintf(2, "%s: trace failed\n", argv[0]);
     exit(1);
   }
-  //保存待跟踪程序的名称和参数
   for(i = 2; i < argc && i < MAXARG; i++){
     nargv[i-2] = argv[i];
   }
-  //运行待跟踪的程序
   exec(nargv[0], nargv);
   exit(0);
 }