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scx_userland: refreshing output option. #2903

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scx_userland: refreshing output option. #2903

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12 changes: 10 additions & 2 deletions scheds/c/scx_userland.c
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,7 @@ const char help_fmt[] =
"Usage: %s [-b BATCH]\n"
"\n"
" -b BATCH The number of tasks to batch when dispatching (default: 8)\n"
" -r Refresh the output instead of printing new lines\n"
" -v Print libbpf debug messages\n"
" -h Display this help and exit\n";

Expand All @@ -51,6 +52,7 @@ const char help_fmt[] =
static __u32 batch_size = 8;

static bool verbose;
static bool refresh;
static volatile int exit_req;
static int enqueued_fd, dispatched_fd;

Expand Down Expand Up @@ -309,7 +311,10 @@ static void *run_stats_printer(void *arg)
printf("| disp: %10llu |\n", nr_vruntime_dispatches);
printf("| failed: %10llu |\n", nr_vruntime_failed);
printf("o-----------------------o\n");
printf("\n\n");
if (refresh)
printf("\033[16A");
else
printf("\n\n");
fflush(stdout);
sleep(1);
}
Expand Down Expand Up @@ -372,14 +377,17 @@ static void pre_bootstrap(int argc, char **argv)
err = syscall(__NR_sched_setscheduler, getpid(), SCHED_EXT, &sched_param);
SCX_BUG_ON(err, "Failed to set scheduler to SCHED_EXT");

while ((opt = getopt(argc, argv, "b:vh")) != -1) {
while ((opt = getopt(argc, argv, "b:vrh")) != -1) {
switch (opt) {
case 'b':
batch_size = strtoul(optarg, NULL, 0);
break;
case 'v':
verbose = true;
break;
case 'r':
refresh = true;
break;
default:
fprintf(stderr, help_fmt, basename(argv[0]));
exit(opt != 'h');
Expand Down