Added additional column to monitor OOM killer score of each process

Process.c

@@ -81,6 +81,9 @@ typedef enum ProcessField_ {
    #ifdef HAVE_CGROUP
    CGROUP,
    #endif
+   #ifdef HAVE_OOM
+   OOM,
+   #endif
    IO_PRIORITY,
    LAST_PROCESSFIELD
 } ProcessField;
@@ -177,6 +180,9 @@ typedef struct Process_ {
    #ifdef HAVE_CGROUP
    char* cgroup;
    #endif
+   #ifdef HAVE_OOM
+   unsigned int oom;
+   #endif
 } Process;
 
 }*/
@@ -202,6 +208,9 @@ const char *Process_fieldNames[] = {
 #endif
 #ifdef HAVE_CGROUP
    "CGROUP",
+#endif
+#ifdef HAVE_OOM
+   "OOM",
 #endif
    "IO_PRIORITY",
 "*** report bug! ***"
@@ -228,6 +237,9 @@ const int Process_fieldFlags[] = {
 #endif
 #ifdef HAVE_CGROUP
    PROCESS_FLAG_CGROUP,
+#endif
+#ifdef HAVE_OOM
+   0,
 #endif
    PROCESS_FLAG_IOPRIO
 };
@@ -253,6 +265,9 @@ const char *Process_fieldTitles[] = {
 #endif
 #ifdef HAVE_CGROUP
    "    CGROUP ",
+#endif
+#ifdef HAVE_OOM
+   "    OOM ",
 #endif
    "IO ",
 "*** report bug! ***"
@@ -276,6 +291,9 @@ void Process_getMaxPid() {
       Process_fieldTitles[TGID] =    "   TGID ";
       Process_fieldTitles[PGRP] =    "   PGRP ";
       Process_fieldTitles[SESSION] = "   SESN ";
+      #ifdef HAVE_OOM
+      Process_fieldTitles[OOM] =     "    OOM ";
+      #endif
       Process_pidFormat = "%7u ";
       Process_tpgidFormat = "%7d ";
    } else {
@@ -285,6 +303,9 @@ void Process_getMaxPid() {
       Process_fieldTitles[TGID] =    " TGID ";
       Process_fieldTitles[PGRP] =    " PGRP ";
       Process_fieldTitles[SESSION] = " SESN ";
+      #ifdef HAVE_OOM
+      Process_fieldTitles[OOM] =     "  OOM ";
+      #endif
       Process_pidFormat = "%5u ";
       Process_tpgidFormat = "%5d ";
    }
@@ -545,6 +566,9 @@ static void Process_writeField(Process* this, RichString* str, ProcessField fiel
    #ifdef HAVE_CGROUP
    case CGROUP: snprintf(buffer, n, "%-10s ", this->cgroup); break;
    #endif
+   #ifdef HAVE_OOM
+   case OOM: snprintf(buffer, n, Process_pidFormat, this->oom); break;
+   #endif
    case IO_PRIORITY: {
       int klass = IOPriority_class(this->ioPriority);
       if (klass == IOPRIO_CLASS_NONE) {
@@ -814,6 +838,10 @@ int Process_compare(const void* v1, const void* v2) {
    case CGROUP:
       return strcmp(p1->cgroup ? p1->cgroup : "", p2->cgroup ? p2->cgroup : "");
    #endif
+   #ifdef HAVE_OOM
+   case OOM:
+      return (p1->oom - p2->oom);
+   #endif
    case IO_PRIORITY:
       return Process_effectiveIOPriority(p1) - Process_effectiveIOPriority(p2);
    default:

Process.h

@@ -60,6 +60,9 @@ typedef enum ProcessField_ {
    #ifdef HAVE_CGROUP
    CGROUP,
    #endif
+   #ifdef HAVE_OOM
+   OOM,
+   #endif
    IO_PRIORITY,
    LAST_PROCESSFIELD
 } ProcessField;
@@ -156,6 +159,9 @@ typedef struct Process_ {
    #ifdef HAVE_CGROUP
    char* cgroup;
    #endif
+   #ifdef HAVE_OOM
+   unsigned int oom;
+   #endif
 } Process;
 
 

ProcessList.c

@@ -660,6 +660,28 @@ static void ProcessList_readVServerData(Process* process, const char* dirname, c
 
 #endif
 
+#ifdef HAVE_OOM
+
+static void ProcessList_readOomData(Process* process, const char* dirname, const char* name) {
+   char filename[MAX_NAME+1];
+   snprintf(filename, MAX_NAME, "%s/%s/oom_score", dirname, name);
+   FILE* file = fopen(filename, "r");
+   if (!file)
+	  return;
+   char buffer[256];
+   if (!fgets(buffer, 255, file)) {
+	   return;
+   }
+   unsigned int oom;
+   int ok = sscanf(buffer, "%u", &oom);
+   if (ok >= 1) {
+	   process->oom = oom;
+   }
+   fclose(file);
+}
+
+#endif
+
 static bool ProcessList_readCmdlineFile(Process* process, const char* dirname, const char* name) {
    if (Process_isKernelThread(process))
       return true;
@@ -784,6 +806,10 @@ static bool ProcessList_processEntries(ProcessList* this, const char* dirname, P
             ProcessList_readVServerData(process, dirname, name);
          #endif
          
+         #ifdef HAVE_OOM
+         ProcessList_readOomData(process, dirname, name);
+         #endif
+
          if (! ProcessList_readCmdlineFile(process, dirname, name))
             goto errorReadingProcess;
 

ProcessList.h

@@ -172,6 +172,10 @@ void ProcessList_sort(ProcessList* this);
 
 #endif
 
+#ifdef HAVE_OOM
+
+#endif
+
 
 void ProcessList_scan(ProcessList* this);
 

configure.ac

@@ -145,5 +145,10 @@ then
    AC_CHECK_HEADERS([hwloc.h],[:], [missing_headers="$missing_headers $ac_header"])
 fi
 
+AC_ARG_ENABLE(oom, [AC_HELP_STRING([--enable-oom], [enable OOM score reporting])], ,enable_oom="no")
+if test "x$enable_oom" = xyes; then
+    AC_DEFINE(HAVE_OOM, 1, [Define if OOM score support enabled.])
+fi
+
 AC_CONFIG_FILES([Makefile htop.1])
 AC_OUTPUT

htop.1.in

@@ -313,6 +313,9 @@ OpenVZ process ID.
 .B VXID
 VServer process ID.
 .TP
+.B OOM
+OOM killer score.
+.TP
 .B All other flags
 Currently unsupported (always displays '-').