overlay: Make it easier to renice

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/overlay/overlay.c b/overlay/overlay.c
index 55c2aa3..6513786 100644 (file)
--- a/overlay/overlay.c
+++ b/overlay/overlay.c
@@ -774,13 +774,13 @@ int main(int argc, char **argv)
        struct overlay_context ctx;
        struct config config;
        int index, sample_period;
-       int daemonize = 1;
+       int daemonize = 1, renice = 0;
        int i;
 
        config_init(&config);
 
        opterr = 0;
-       while ((i = getopt_long(argc, argv, "c:f", long_options, &index)) != -1) {
+       while ((i = getopt_long(argc, argv, "c:fn?", long_options, &index)) != -1) {
                switch (i) {
                case 'c':
                        config_parse_string(&config, optarg);
@@ -797,6 +797,11 @@ int main(int argc, char **argv)
                case 'f':
                        daemonize = 0;
                        break;
+               case 'n':
+                       renice = -20;
+                       if (optarg)
+                               renice = atoi(optarg);
+                       break;
                }
        }
 
@@ -820,6 +825,9 @@ int main(int argc, char **argv)
        if (daemonize && daemon(0, 0))
                return EINVAL;
 
+       if (renice)
+               nice(renice);
+
        signal(SIGUSR1, signal_snapshot);
 
        debugfs_init();