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Merge tag 'sched_ext-for-7.0-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext

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Pull sched_ext fixes from Tejun Heo:

 - Various bug fixes for the example schedulers and selftests

* tag 'sched_ext-for-7.0-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext:
  tools/sched_ext: fix getopt not re-parsed on restart
  tools/sched_ext: scx_userland: fix data races on shared counters
  tools/sched_ext: scx_pair: fix stride == 0 crash on single-CPU systems
  tools/sched_ext: scx_central: fix CPU_SET and skeleton leak on early exit
  tools/sched_ext: scx_userland: fix stale data on restart
  tools/sched_ext: scx_flatcg: fix potential stack overflow from VLA in fcg_read_stats
  selftests/sched_ext: Fix rt_stall flaky failure
  tools/sched_ext: scx_userland: fix restart and stats thread lifecycle bugs
  tools/sched_ext: scx_central: fix sched_setaffinity() call with the set size
  tools/sched_ext: scx_flatcg: zero-initialize stats counter array
This commit is contained in:
Linus Torvalds
2026-02-21 09:38:59 -08:00
parent 8eb604d4ee 640c9dc72f
commit 4cf4465788
8 changed files with 96 additions and 18 deletions
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49
tools/testing/selftests/sched_ext/rt_stall.c
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@@ -23,6 +23,30 @@
#define CORE_ID 0 /* CPU to pin tasks to */
#define RUN_TIME 5 /* How long to run the test in seconds */
/* Signal the parent that setup is complete by writing to a pipe */
static void signal_ready(int fd)
{
char c = 1;
if (write(fd, &c, 1) != 1) {
perror("write to ready pipe");
exit(EXIT_FAILURE);
}
close(fd);
}
/* Wait for a child to signal readiness via a pipe */
static void wait_ready(int fd)
{
char c;
if (read(fd, &c, 1) != 1) {
perror("read from ready pipe");
exit(EXIT_FAILURE);
}
close(fd);
}
/* Simple busy-wait function for test tasks */
static void process_func(void)
{
@@ -122,14 +146,24 @@ static bool sched_stress_test(bool is_ext)
float ext_runtime, rt_runtime, actual_ratio;
int ext_pid, rt_pid;
int ext_ready[2], rt_ready[2];
ksft_print_header();
ksft_set_plan(1);
if (pipe(ext_ready) || pipe(rt_ready)) {
perror("pipe");
ksft_exit_fail();
}
/* Create and set up a EXT task */
ext_pid = fork();
if (ext_pid == 0) {
close(ext_ready[0]);
close(rt_ready[0]);
close(rt_ready[1]);
set_affinity(CORE_ID);
signal_ready(ext_ready[1]);
process_func();
exit(0);
} else if (ext_pid < 0) {
@@ -140,8 +174,12 @@ static bool sched_stress_test(bool is_ext)
/* Create an RT task */
rt_pid = fork();
if (rt_pid == 0) {
close(ext_ready[0]);
close(ext_ready[1]);
close(rt_ready[0]);
set_affinity(CORE_ID);
set_sched(SCHED_FIFO, 50);
signal_ready(rt_ready[1]);
process_func();
exit(0);
} else if (rt_pid < 0) {
@@ -149,6 +187,17 @@ static bool sched_stress_test(bool is_ext)
ksft_exit_fail();
}
/*
* Wait for both children to complete their setup (affinity and
* scheduling policy) before starting the measurement window.
* This prevents flaky failures caused by the RT child's setup
* time eating into the measurement period.
*/
close(ext_ready[1]);
close(rt_ready[1]);
wait_ready(ext_ready[0]);
wait_ready(rt_ready[0]);
/* Let the processes run for the specified time */
sleep(RUN_TIME);