** Description changed:
== SRU Justification ==
A new regression test case "sched_rr_get_interval01" for commit 975e155ed873
("sched/rt: Show the 'sched_rr_timeslice' SCHED_RR timeslice tuning knob in
milliseconds"). Has been added to the LTP syscalls test suite.
On Xenial 4.4.0-186.216, this test is failing with:
startup='Wed Jul 8 10:36:58 2020'
tst_test.c:1247: INFO: Timeout per run is 0h 05m 00s
sched_rr_get_interval01.c:43: INFO: Testing variant: vDSO or syscall with
libc spec
sched_rr_get_interval01.c:60: PASS: sched_rr_get_interval() passed
sched_rr_get_interval01.c:68: PASS: Time quantum 0s 100000000ns
sched_rr_get_interval01.c:75: FAIL: /proc/sys/kernel/sched_rr_timeslice_ms
!= 100 got 25
tst_test.c:1247: INFO: Timeout per run is 0h 05m 00s
sched_rr_get_interval01.c:43: INFO: Testing variant: syscall with old kernel
spec
sched_rr_get_interval01.c:60: PASS: sched_rr_get_interval() passed
sched_rr_get_interval01.c:68: PASS: Time quantum 0s 100000000ns
sched_rr_get_interval01.c:75: FAIL: /proc/sys/kernel/sched_rr_timeslice_ms
!= 100 got 25
HINT: You _MAY_ be missing kernel fixes, see:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=975e155ed873
Summary:
passed 4
failed 2
skipped 0
warnings 0
tag=sched_rr_get_interval01 stime=1594204618 dur=0 exit=exited stat=1
core=no cu=0 cs=0
== Fixes ==
975e155ed873 ("sched/rt: Show the 'sched_rr_timeslice' SCHED_RR timeslice
tuning knob in milliseconds")
This patch can be cherry-picked in to the affected Xenial kernel. It's
already been applied in newer kernels.
== Test ==
Test kernel can be found here:
https://people.canonical.com/~phlin/kernel/lp-1886890-sched_rr_get_interval01/
With the patch applied, this test will pass without any issue.
+
+ And it can be simply tested with:
+ # echo 100 > /proc/sys/kernel/sched_rr_timeslice_ms
+ # cat /proc/sys/kernel/sched_rr_timeslice_ms
+ 100
+ (was 25 before the patch)
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https://bugs.launchpad.net/bugs/1886890
Title:
sched_rr_get_interval01 from ubuntu_ltp_syscalls failed on 4.4
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