[LTP] [PATCH v3] sched: starvation: Autocallibrate the timeout

[Petr Vorel]

Hi,

> Hi!
> > tst_tmpdir.c:316: TINFO: Using /tmp/LTP_starv8seE as tmpdir (tmpfs filesystem)
> > tst_test.c:1806: TINFO: LTP version: 20240524
> > tst_test.c:1650: TINFO: Timeout per run is 0h 00m 30s
> > starvation.c:71: TINFO: Setting affinity to CPU 0
> > tst_test.c:1658: TINFO: Updating max runtime to 0h 04m 00s
> > tst_test.c:1650: TINFO: Timeout per run is 0h 04m 30s
> > starvation.c:117: TPASS: wait_for_pid(child_pid) passed

> > => test runs ~ 13s - 19s on aarch64, ppc64le and x86_64. Therefore not sure if
> > 04m max runtime is good.

OK, now testing with your patchset :)
https://github.com/pevik/ltp/commit/0392e5142c5e8cb1d38dec9916a9f0118cf27afe

All tests are on KVM.

* aarch64 6.10.1-1-default (8s)
tst_test.c:1650: TINFO: Timeout per run is 0h 00m 30s
starvation.c:52: TINFO: CPU did 120000000 loops in 42654us
tst_test.c:1658: TINFO: Updating max runtime to 0h 00m 42s
tst_test.c:1650: TINFO: Timeout per run is 0h 01m 12s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* ppc64le 6.10.1-1-default (9s)
...
tst_test.c:1650: TINFO: Timeout per run is 0h 00m 30s
starvation.c:52: TINFO: CPU did 120000000 loops in 98081us
tst_test.c:1658: TINFO: Updating max runtime to 0h 01m 38s
=> FYI HERE IS DIFFERENCE over 1 min
tst_test.c:1650: TINFO: Timeout per run is 0h 02m 08s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* x86_64 6.10.1-1-default (10s)
tst_test.c:1650: TINFO: Timeout per run is 0h 00m 30s
starvation.c:52: TINFO: CPU did 120000000 loops in 41908us
tst_test.c:1658: TINFO: Updating max runtime to 0h 00m 41s
tst_test.c:1650: TINFO: Timeout per run is 0h 01m 11s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

Some SLES
* s390x 6.4 (6s)
starvation.c:52: TINFO: CPU did 120000000 loops in 53599us
tst_test.c:1659: TINFO: Updating max runtime to 0h 00m 53s
tst_test.c:1652: TINFO: Timeout per run is 0h 01m 23s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* s390x 6.4 (6s)
starvation.c:52: TINFO: CPU did 120000000 loops in 53599us
tst_test.c:1659: TINFO: Updating max runtime to 0h 00m 53s
tst_test.c:1652: TINFO: Timeout per run is 0h 01m 23s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* x86_64 5.14.21 (5s)
starvation.c:52: TINFO: CPU did 120000000 loops in 75176us
tst_test.c:1659: TINFO: Updating max runtime to 0h 01m 15s
tst_test.c:1652: TINFO: Timeout per run is 0h 01m 45s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* aarch64 5.14.21 (9s)
starvation.c:52: TINFO: CPU did 120000000 loops in 42404us
tst_test.c:1659: TINFO: Updating max runtime to 0h 00m 42s
tst_test.c:1652: TINFO: Timeout per run is 0h 01m 12s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* ppc64le 5.14.21 (16s)
starvation.c:52: TINFO: CPU did 120000000 loops in 147223us
tst_test.c:1659: TINFO: Updating max runtime to 0h 02m 27s
tst_test.c:1652: TINFO: Timeout per run is 0h 02m 57s
=> FYI HERE IS DIFFERENCE 2 min
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* aarch64 5.3.18 (8s)
starvation.c:52: TINFO: CPU did 120000000 loops in 42382us
tst_test.c:1659: TINFO: Updating max runtime to 0h 00m 42s
tst_test.c:1652: TINFO: Timeout per run is 0h 01m 12s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* ppc64le 5.3.18 (50s)
starvation.c:52: TINFO: CPU did 120000000 loops in 140564us
tst_test.c:1659: TINFO: Updating max runtime to 0h 02m 20s
tst_test.c:1652: TINFO: Timeout per run is 0h 02m 50s
=> FYI HERE IS DIFFERENCE 2 min
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* aarch64 4.12.14 (12s)
starvation.c:52: TINFO: CPU did 120000000 loops in 55491us
tst_test.c:1659: TINFO: Updating max runtime to 0h 00m 55s
tst_test.c:1652: TINFO: Timeout per run is 0h 01m 25s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* ppc64le 4.12.14 (1m 9s FYI HIGHEST RUNTIME)
starvation.c:52: TINFO: CPU did 120000000 loops in 147102us
tst_test.c:1659: TINFO: Updating max runtime to 0h 02m 27s
tst_test.c:1652: TINFO: Timeout per run is 0h 02m 57s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* s390x 4.12.14 (5s)
starvation.c:52: TINFO: CPU did 120000000 loops in 49973us
tst_test.c:1659: TINFO: Updating max runtime to 0h 00m 49s
tst_test.c:1652: TINFO: Timeout per run is 0h 01m 19s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

* x86_64 4.4.180 (10s)
starvation.c:52: TINFO: CPU did 120000000 loops in 37042us
tst_test.c:1659: TINFO: Updating max runtime to 0h 00m 37s
tst_test.c:1652: TINFO: Timeout per run is 0h 01m 07s
starvation.c:150: TPASS: Haven't reproduced scheduller starvation.

Kind regards,
Petr