@@ -836,6 +836,8 @@ static void display_help(int error)
" --laptop Save battery when running cyclictest\n"
" This will give you poorer realtime results\n"
" but will not drain your battery so quickly\n"
+ " --mainaffinity=[CPUSET] Run the main thread on CPU #N. This only affects\n"
+ " the main thread and not the measurement threads\n"
"-m --mlockall lock current and future memory allocations\n"
"-M --refresh_on_max delay updating the screen until a new max\n"
" latency is hit. Useful for low bandwidth.\n"
@@ -891,6 +893,7 @@ static int quiet;
static int interval = DEFAULT_INTERVAL;
static int distance = -1;
static struct bitmask *affinity_mask = NULL;
+static struct bitmask *main_affinity_mask = NULL;
static int smp = 0;
static int clocksources[] = {
@@ -943,7 +946,7 @@ enum option_values {
OPT_AFFINITY=1, OPT_BREAKTRACE, OPT_CLOCK,
OPT_DISTANCE, OPT_DURATION, OPT_LATENCY,
OPT_FIFO, OPT_HISTOGRAM, OPT_HISTOFALL, OPT_HISTFILE,
- OPT_INTERVAL, OPT_LOOPS, OPT_MLOCKALL, OPT_REFRESH,
+ OPT_INTERVAL, OPT_LOOPS, OPT_MAINAFFINITY, OPT_MLOCKALL, OPT_REFRESH,
OPT_NANOSLEEP, OPT_NSECS, OPT_OSCOPE, OPT_PRIORITY,
OPT_QUIET, OPT_PRIOSPREAD, OPT_RELATIVE, OPT_RESOLUTION,
OPT_SYSTEM, OPT_SMP, OPT_THREADS, OPT_TRIGGER,
@@ -980,6 +983,7 @@ static void process_options(int argc, char *argv[], int max_cpus)
{"interval", required_argument, NULL, OPT_INTERVAL },
{"laptop", no_argument, NULL, OPT_LAPTOP },
{"loops", required_argument, NULL, OPT_LOOPS },
+ {"mainaffinity", required_argument, NULL, OPT_MAINAFFINITY},
{"mlockall", no_argument, NULL, OPT_MLOCKALL },
{"refresh_on_max", no_argument, NULL, OPT_REFRESH },
{"nsecs", no_argument, NULL, OPT_NSECS },
@@ -1071,6 +1075,16 @@ static void process_options(int argc, char *argv[], int max_cpus)
case 'l':
case OPT_LOOPS:
max_cycles = atoi(optarg); break;
+ case OPT_MAINAFFINITY:
+ if (optarg) {
+ parse_cpumask(optarg, max_cpus, &main_affinity_mask);
+ } else if (optind < argc &&
+ (atoi(argv[optind]) ||
+ argv[optind][0] == '0' ||
+ argv[optind][0] == '!')) {
+ parse_cpumask(argv[optind], max_cpus, &main_affinity_mask);
+ }
+ break;
case 'm':
case OPT_MLOCKALL:
lockall = 1; break;
@@ -1777,7 +1791,9 @@ int main(int argc, char **argv)
}
/* Restrict the main pid to the affinity specified by the user */
- if (affinity_mask) {
+ if (main_affinity_mask) {
+ try_numa_sched_setaffinity(getpid(), main_affinity_mask);
+ } else if (affinity_mask) {
try_numa_sched_setaffinity(getpid(), affinity_mask);
if (verbose)
printf("Using %u cpus.\n",
This allows the user to specify a separate cpuset for the main pid, e.g. on a housekeeping CPU. If --mainaffinity is not specified, but --affinity is, then the current behaviour is preserved and the main pid is bound to the cpuset specified by --affinity Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com> --- src/cyclictest/cyclictest.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-)