pctl Display memory usage and process state

kernel/syscall/processctl.c

@@ -142,6 +142,12 @@ int32_t SYSCALL5(sys_processctl, pid1, cmd1, arg1, arg2, arg3) {
           hal_strcpy(stat->name, p->name);
           stat->state = p->state;
           stat->kern = p->kern;
+
+          VasRange *range = p->vas;
+          while (range) {
+            stat->usemem += range->size;
+            range = range->next;
+          }
           break;
         }
 

user/pctl/ls.c

@@ -6,18 +6,69 @@
 #include <errors.h>
 #include <uprintf.h>
 #include <string/string.h>
+#include <dlmalloc/malloc.h>
+
+const char *human_size(uint64_t bytes, char *buf, size_t bufsize) {
+  static const char *units[] = { "B", "KiB", "MiB", "GiB", "TiB", "PiB" };
+  int unit = 0;
+
+  // Scale down until value fits nicely
+  uint64_t rem = 0;
+  while (bytes >= 1024 && unit < (int)(sizeof(units)/sizeof(units[0])) - 1) {
+    rem = bytes % 1024;
+    bytes /= 1024;
+    unit++;
+  }
+
+  if (unit == 0) {
+    // Just bytes
+    usnprintf(buf, bufsize, "%llu %s", (unsigned long long)bytes, units[unit]);
+  } else {
+    // Show one decimal place without using floats
+    // Multiply remainder by 10 to get first decimal digit
+    uint64_t frac = (rem * 10 + 512) / 1024; // rounded
+    if (frac == 10) { // handle carry, e.g. 1023.9 -> 1024.0
+      bytes++;
+      frac = 0;
+    }
+
+    if (frac > 0) usnprintf(buf, bufsize, "%llu.%llu %s", (unsigned long long)bytes, (unsigned long long)frac, units[unit]);
+    else usnprintf(buf, bufsize, "%llu %s", (unsigned long long)bytes, units[unit]);
+  }
+
+  return buf;
+}
+  
   
 void pctl_ls(void) {
+  static const char *states[] = {"embryo", "ready", "zombie", "waiting", "died"};
+
   uint64_t procslen = processctl(-1, PCTL_PLS_SZ, 0, 0, 0);
-  uprintf("%-30s %s %-6s\n", "NAME", "PID", "TYPE");
+
+  char *namebuf = dlmalloc(34);
+  char *membuf = dlmalloc(20);
+  
+  uprintf("%-30s %s %-6s %-15s %-8s\n", "NAME", "PID", "TYPE", "MEMORY", "STATE");
   for (size_t i = 0; i < procslen; i++) {
     ProcStat stat = ZERO(&stat);
-    char namebuf[34] = {0};
+
+    string_memset(namebuf, 0, 34);
+    string_memset(membuf, 0, 20);
+
     int32_t r = processctl(-1, PCTL_PLS_STAT, i, (uint64_t)&stat, 0);
     if (r == E_OK) {
       string_memcpy(namebuf, stat.name, 30);
       namebuf[31] = namebuf[32] = namebuf[33] = '.';
-      uprintf("%-30s %3lu %-6s\n", namebuf, stat.pid, stat.kern ? "KERNEL" : "USER");
+
+      // Too big format string causes a stack overflow. This is an issue with printf ;(
+      uprintf("%-30s %-3lu %-6s %-15s ",
+              namebuf,
+              stat.pid,
+              stat.kern ? "KERNEL" : "USER",
+              human_size(stat.usemem, membuf, 20)
+            );
+      uprintf("%-8s", states[stat.state]);
+      uprintf("\n");
     }
   }
 }