Hi,
I wrote a small test program to play around with SCHED_DEADLINE which
triggered various PI related crashes. Steven convinced me to get
the test somehow upstream. I figured pi_stress is very simular with my
test program. So here my attempt to merge the essence of my test
into pi_stress.c
patch 1: hackbench: Don't re-assign context for each fd
patch 2: rt-tests.h: Remove unused header file
patch 3: pi_stress: Remove unused TIMER_SIGNAL definition
Not really related to this series. Just found it while
browsing the code a bit. Are you interested in such
patches?
patch 4: error: Add debug() function
patch 5: pi_stress: Use error.h for logging and debugging
I didn't want to add the sched_setattr() code directly
to pi_stress.c. As soon rt-utils.h is used you get also
error.h which brings info() and friends it collides
in pi_stress.c.
Several other tests also implement info() and friends.
Would it make sense to convert them using error.h too?
Then I would also suggest to get --verbose and
--debug options handled in a central way. Maybe something
like the GLib does with parsing the argc first and hanlding
those flags. What do you think?
patch 6: rt-sched: Add sched_setattr/sched_getattr API
patch 7: rt-utils: Add helper to parse/print scheduling policies
patch 8: rt-utils: Add gettid()
Add to the library some of the code which could be reused
by other tests as well. Nothing really fancy.
patch 9: pi_stress: Store schedule attributes per thread
Finally this adds the a command line arguments which
allows the user to define which scheduler setting is
used for each thread catagory:
# ./pi_stress --sched id=high,policy=deadline,runtime=100000,deadline=200000,period=200000
Starting PI Stress Test
Number of thread groups: 1
Duration of test run: infinite
Number of inversions per group: unlimited
Admin thread SCHED_FIFO priority 4
1 groups of 3 threads will be created
High thread SCHED_DEADLINE runtime 100000 deadline 200000 period 200000
Med thread SCHED_FIFO priority 2
Low thread SCHED_FIFO priority 1
Current Inversions: 2446249
Stopping test
Terminated
WARNING: Do no run this on older kernels (<3.18-rc3) it will crash your
system. You have been warned!
Obviously, you can also do some stupid stuff like:
# ./pi_stress --rr --sched id=high,policy=deadline,h=dl,runtime=100000,deadline=200000,period=200000 --sched id=low,policy=fifo,priority=3
Starting PI Stress Test
Number of thread groups: 1
Duration of test run: infinite
Number of inversions per group: unlimited
Admin thread SCHED_RR priority 4
1 groups of 3 threads will be created
High thread SCHED_DEADLINE runtime 100000 deadline 200000 period 200000
Med thread SCHED_RR priority 2
Low thread SCHED_FIFO priority 3
Current Inversions: 352306
Stopping test
Terminated
cheers,
daniel
Cc: Clark Williams <williams@xxxxxxxxxx>
Cc: John Kacur <jkacur@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Dario Faggioli <raistlin@xxxxxxxx>
Cc: <linux-rt-users@xxxxxxxxxxxxxxx>
Daniel Wagner (9):
hackbench: Don't re-assign context for each fd
rt-tests.h: Remove unused header file
pi_stress: Remove unused TIMER_SIGNAL definition
error: Add debug() function
pi_stress: Use error.h for logging and debugging
rt-sched: Add sched_setattr/sched_getattr API
rt-utils: Add helper to parse/print scheduling policies
rt-utils: Add gettid()
pi_stress: Store schedule attributes per thread
Makefile | 4 +-
src/hackbench/hackbench.c | 8 +-
src/include/error.h | 1 +
src/include/rt-sched.h | 76 +++++++
src/include/rt-tests.h | 124 ------------
src/include/rt-utils.h | 7 +
src/lib/error.c | 10 +
src/lib/rt-sched.c | 43 ++++
src/lib/rt-utils.c | 44 ++++
src/pi_tests/pi_stress.c | 500 ++++++++++++++++++++++++++++++----------------
10 files changed, 512 insertions(+), 305 deletions(-)
create mode 100644 src/include/rt-sched.h
delete mode 100644 src/include/rt-tests.h
create mode 100644 src/lib/rt-sched.c
--
1.9.3
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