- scheduler: add optional <host_summary_regex> element to plan_class_spec.xml.

This regular expression is matched against the "host summary" string
    stored in host.serialnum.
    You can use this, e.g., to allow only particular GPU models.

sched/plan_class_spec.cpp

@@ -93,6 +93,20 @@ bool PLAN_CLASS_SPEC::check(SCHEDULER_REQUEST& sreq, HOST_USAGE& hu) {
         return false;
     }
 
+    // host summary
+    //
+    if (have_host_summary_regex
+        && regexec(&(host_summary_regex), g_reply->host.serialnum, 0, NULL, 0)
+    ) {
+        if (config.debug_version_select) {
+            log_messages.printf(MSG_NORMAL,
+                "[version] plan_class_spec: host summary '%s' didn't match regexp\n",
+                g_reply->host.serialnum
+            );
+        }
+        return false;
+    }
+
     // OS version
     //
     if (have_os_regex && regexec(&(os_regex), sreq.host.os_version, 0, NULL, 0)) {
@@ -632,6 +646,14 @@ int PLAN_CLASS_SPEC::parse(XML_PARSER& xp) {
             have_os_regex = true;
             continue;
         }
+        if (xp.parse_str("host_summary_regex", buf, sizeof(buf))) {
+            if (regcomp(&(host_summary_regex), buf, REG_EXTENDED|REG_NOSUB) ) {
+                log_messages.printf(MSG_CRITICAL, "BAD REGEXP: %s\n", buf);
+                return ERR_XML_PARSE;
+            }
+            have_host_summary_regex = true;
+            continue;
+        }
         if (xp.parse_str("project_prefs_tag", project_prefs_tag, sizeof(project_prefs_tag))) continue;
         if (xp.parse_str("project_prefs_regex", buf, sizeof(buf))) {
             if (regcomp(&(project_prefs_regex), buf, REG_EXTENDED|REG_NOSUB) ) {
@@ -710,6 +732,7 @@ PLAN_CLASS_SPEC::PLAN_CLASS_SPEC() {
     max_threads = 1;
     projected_flops_scale = 1;
     have_os_regex = false;
+    have_host_summary_regex = false;
     strcpy(project_prefs_tag, "");
     have_project_prefs_regex = false;
     avg_ncpus = 0;

sched/plan_class_spec.h

@@ -44,6 +44,8 @@ struct PLAN_CLASS_SPEC {
     int min_core_client_version;
     int max_core_client_version;
         // for non-compute-intensive, or override for GPU apps
+    bool have_host_summary_regex;
+    regex_t host_summary_regex;
 
     // GPU apps
     //