so a normal user is able to take a look on the available options
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Clark Williams <williams@redhat.com>
if cyclictest is started with invalid arguments or $SOMETHING, then it
prints the help screen and the exit code is 0 which is wrong.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Clark Williams <williams@redhat.com>
moved policy display from individual threads to header with load average
did some sanity checking so that policy and priority match
Signed-off-by: Clark Williams <williams@redhat.com>
"cyclictest --help".
From: GeunSik Lim <leemgs1@gmail.com>
Reply-To: leemgs1@gmail.com
To: williams <williams@redhat.com>
Cc: linux-rt-users <linux-rt-users@vger.kernel.org>, tglx <tglx@linutronix.de>
When we use "#> cyclictest --help" command, we are confusing because of
random order of many options. Arrange alphabetically.
After Patch)
[root@fedora11 rt-tests]# ./cyclictest --help
cyclictest V 0.46
Usage:
cyclictest <options>
-a [NUM] --affinity run thread #N on processor #N, if possible
with NUM pin all threads to the processor NUM
-b USEC --breaktrace=USEC send break trace command when latency > USEC
-B --preemptirqs both preempt and irqsoff tracing (used with -b)
-c CLOCK --clock=CLOCK select clock
0 = CLOCK_MONOTONIC (default)
1 = CLOCK_REALTIME
-C --context context switch tracing (used with -b)
-d DIST --distance=DIST distance of thread intervals in us default=500
-D --duration=t specify a length for the test run
default is in seconds, but 'm', 'h', or 'd' maybe added
to modify value to minutes, hours or days
-E --event event tracing (used with -b)
-f --ftrace function trace (when -b is active)
-h --histogram=US dump a latency histogram to stdout after the run
(with same priority about many threads)
US is the max time to be be tracked in microseconds
-i INTV --interval=INTV base interval of thread in us default=1000
-I --irqsoff Irqsoff tracing (used with -b)
-l LOOPS --loops=LOOPS number of loops: default=0(endless)
-m --mlockall lock current and future memory allocations
-n --nanosleep use clock_nanosleep
-N --nsecs print results in ns instead of ms (default ms)
-o RED --oscope=RED oscilloscope mode, reduce verbose output by RED
-O TOPT --traceopt=TOPT trace option
-p PRIO --prio=PRIO priority of highest prio thread
-P --preemptoff Preempt off tracing (used with -b)
-q --quiet print only a summary on exit
-r --relative use relative timer instead of absolute
-s --system use sys_nanosleep and sys_setitimer
-t --threads one thread per available processor
-t [NUM] --threads=NUM number of threads:
without NUM, threads = max_cpus
without -t default = 1
-T TRACE --tracer=TRACER set tracing function
configured tracers: unavailable (debugfs not mounted)
-v --verbose output values on stdout for statistics
format: n:c:v n=tasknum c=count v=value in us
-w --wakeup task wakeup tracing (used with -b)
-W --wakeuprt rt task wakeup tracing (used with -b)
-y POLI --policy=POLI policy of realtime thread (1:FIFO, 2:RR)
format: --policy=1(default) or --policy=2
Signed-by-off: GeunSik Lim <geunsik.lim@samsung.com>
Signed-off-by: Clark Williams <williams@redhat.com>
users
From: GeunSik Lim <leemgs1@gmail.com>
To: williams <williams@redhat.com>
Cc: linux-rt-users <linux-rt-users@vger.kernel.org>, tglx <tglx@linutronix.de>
Current cyclictest support FIFO policy for static priority of
RT threads only. Append policy option to support FIFO or RR by user.
After this patch.
1) with FIFO about RT threads(default)
./cyclictest -t 5 -p 50
or ./cyclictest -t 5 -p 50 -y 1
or ./cyclictest -t 5 -p 50 --policy 1
2) with RR about RT threads(default)
./cyclictest -t 5 -p 50 -y 2
or ./cyclictest -t 5 -p 50 --policy 2
This is screenshot of threads using cyclictest & tuna utility after patch.
http://blogfiles6.naver.net/20090703_5/invain_1246588185266_sc7zEq_PNG/cyclictest-tuna-policy.PNG
Signed-off-by: GeunSik Lim <geunsik.lim@samsung.com>
Signed-off-by: Clark Williams <williams@redhat.com>
of many threads with -h
From: GeunSik Lim <leemgs1@gmail.com>
Reply-To: leemgs1@gmail.com
To: williams <williams@redhat.com>
Cc: linux-rt-users <linux-rt-users@vger.kernel.org>, tglx <tglx@linutronix.de>,
sdietrich@suse.de
If we run a many threads with -t option, "priority--" rt priority will assign
per thread in sequence. But, If we use -h option, all threads is same priority.
Append man page and cyclictest usage about the same priority of many threads
with -h option.
ex) cyclictest -t 5 -p 50 [enter] <-- without -h
ex) cyclictest -t 5 -p 50 -h 100 [enter] <-- with -h
Signed-off-by: GeunSik Lim <geunsik.lim@samsung.com>
Acked-by : Sven-Thorsten Dietrich <sdietrich@suse.de>
Signed-off-by: Clark Williams <williams@redhat.com>
Don't miss latency which exceed the histogram limit -
instead sample limit exceeding latency in the last bucket.
This is a leftover from cyclictest_histogram.patch:
-> Todo: Currently cyclictest does not report the number of samples
-> that exceeded the histogram max latency.
Handle OOM.
Signed-off-by: Daniel Gollub <dgollub@suse.de>
Reviewed-by: Sven-Thorsten Dietrich <sdietrich@suse.de>
--
This is useful when testing PREEMPT_NONE Kernels with cyclictest,
where latencies approaching 1 second can be observed.
Signed-off-by: Sven-Thorsten Dietrich <sdietrich@suse.de>
If clock_nanosleep() gets interrupted this could result in a negative
time diff from calcdiff().
With the histogram patch this leads to a segfault, since the time diff
is used as index for the histogram array:
Core was generated by `/usr/bin/cyclictest -n -q -p 99 -t 2 -i 500 -l
1000000 -h
20000'.
Program terminated with signal 11, Segmentation fault.
#0 0x0000000000402324 in timerthread (param=<value optimized out>)
at src/cyclictest/cyclictest.c:339
339 stat->hist_array[diff] += 1;
(gdb) p diff
$1 = -751974
Signed-off-by: Daniel Gollub <dgollub@suse.de>
Acked-by: Sven-Thorsten Dietrich <sdietrich@suse.de>
You might wonder if this wasn't already fixed. Yes it was (in
f16ec27fb3), but the change was undone by 3e04327f7f.
While at it add an .br which makes the paragraph look a bit nicer.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
This was noticed by GeunSik Lim.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: GeunSik Lim <leemgs1@gmail.com>
Cc: Luis Claudio R. Goncalves <lclaudio@uudg.org>
Cc: Clark Williams <williams@redhat.com>
Hello,
My first fix didn't took into account that long is 4 byte long on ARM. Therefor
I changed it to long long now, which works on my ARM board...
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Clark Williams <williams@redhat.com>
'-' chars are interpreted as hyphens by groff, not as minus signs. This
means that if you're using an UTF-8 locale searching for '-' to find
options doesn't work.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Hi Thomas,
The patch below removes the duplicate entry for the -m/--mlockall option from
the cyclictest manpage. Patch is againnst current HEAD of rt-tests.git
Cheers, Tobias
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
This is patch to support wakeup & wakeup_rt tracing at the argument of
cyclictest additionally. Current cyclictest support three tracing
like PREEMPTOFF, IRQSOFF, PREEMPTIRQSOFF just.
This additional function will help wakeup related tracing
about sleep api [ex: nanosleep() , usleep] of cyclictest.
Practically speaking, wakeup(+wakeup-rt) tracing by steven rostedt is useful
in the linux based embedded product development.
After patching,
Fedora9#> cat /debug/tracing/available_tracers
syscall blk kmemtrace power branch function_graph mmiotrace wakeup_rt wakeup \
preemptirqsoff preemptoff irqsoff function sched_switch initcall nop
Fedora9#> cyclictest -t 5 -p 80 -b 1000 -w -D 10 [enter] <--- tracing wakeup
Fedora9#> cat /debug/tracing/trace
Fedora9#> cyclictest -t 5 -p 80 -b 1000 -W -D 10 [enter] <--- tracing wakeup-rt
Fedora9#> cat /debug/tracing/trace
Signed-off-by: GeunSik Lim <geunsik.lim@samsung.com>
Signed-off-by: Clark Williams <williams@redhat.com>
Author: Lim,GeunSik <leemgs1@gmail.com>
Date: Tue Apr 21 16:03:56 2009 +0900
[PATCH] cyclictest: Remove duplicated description of cyclictest usage like -h.
We often utilize a various options with "#>cyclictest --help" command in the terminal environment.
When We run "#> cyclictest --help" command, We can show duplicated description about "-h" option
for latency histogram.
Unfortunatley, Some of the users is confusing because of two options about latency histogram.
[root@fedora9 invain]# ./cyclictest --help
cyclictest V 0.36
Usage:
cyclictest <options>
-a [NUM] --affinity run thread #N on processor #N, if possible
with NUM pin all threads to the processor NUM
-b USEC --breaktrace=USEC send break trace command when latency > USEC
-B --preemptirqs both preempt and irqsoff tracing (used with -b)
-c CLOCK --clock=CLOCK select clock
0 = CLOCK_MONOTONIC (default)
1 = CLOCK_REALTIME
-C --context context switch tracing (used with -b)
-d DIST --distance=DIST distance of thread intervals in us default=500
-E --event event tracing (used with -b)
-f --ftrace function trace (when -b is active)
-h H_MAX latency histogram size in us default 0 (off)
-i INTV --interval=INTV base interval of thread in us default=1000
................. [Middle Omission] ...................
-v --verbose output values on stdout for statistics
format: n:c:v n=tasknum c=count v=value in us
-D --duration=t specify a length for the test run
default is in seconds, but 'm', 'h', or 'd' maybe added
to modify value to minutes, hours or days
-h --histogram=US dump a latency histogram to stdout after the run
US is the max time to be be tracked in microseconds
For example,
-h H_MAX latency histogram size in us default 0 (off)
-h --histogram=US dump a latency histogram to stdout after the run
US is the max time to be be tracked in microseconds
As you see, We don't need "-h H_MAX . . . . . ." description.
So, I think that We have to remove old option about description of histogram function.
Signed-off-by: GeunSik Lim <leemgs1@gmail.com>
Author: Lim,GeunSik <leemgs1@gmail.com>
Date: Wed Apr 8 22:21:59 2009 +0900
[patch] cyclictest: bugfix getopt_long() for -C and -F.
We can not use -C option without --context option for tracing context switching.
ex) ./cyclictest -t 10 -m -b 100 -C
We can not use -E option without --event option for tracing events.
ex) ./cyclictest -t 10 -m -b 100 -E
Append -C and -E option on getopt_long() function to solve this problems.
Signed-off-by: GeunSik Lim <leemgs1@gmail.com>
Signed-off-by: Clark Williams <williams@redhat.com>
GeunSik Lim <leemgs1@gmail.com> found a problem with settracer()
in that it had a hardcoded limit to the number of tracers searched.
Unfortunately his patch found a bug in either fscanf or debugfs,
since it doesn't seem to return EOF at the end of input, so I reworked
the patch to read all the input and parse it using strtok.
Signed-off-by: Clark Williams <williams@redhat.com>
cyclictest results are presented in microseconds, although internal precision
uses nanosecond unit. This patch adds a command-line option for keeping the
nanoseconds precision. man page has also been update.
Signed-off-by: Luis Henriques <henrix@sapo.pt>
Signed-off-by: Clark Williams <williams@redhat.com>
The tracer setup happens in every thread, which is nonsense. First of
all it leads to a lot of irritating warnings because the things are
setup multiple times. The worst effect is that one tasks runs already
into the tracer stop condition and the next one reenables the tracer.
Move the tracer setup into the main thread and do it only once.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Clark Williams <williams@redhat.com>
Switching back to SCHED_OTHER in check_priv() fails due to the param
argument of sched_setscheduler() set to NULL.
Set the priority to 0 and hand in params.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Clark Williams <williams@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Subject: [patch 2/2] cyclictest: support for latest mainline tracer
The tracer in mainline changed the interface another time. Make it
work again.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Clark Williams <williams@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Subject: [patch 1/2] cyclictest: code cleanup
Started to grow whitespace and formatting sloppiness.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Clark Williams <williams@redhat.com>
Signed-off-by: Clark Williams <williams@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Luis Claudio Goncalves <lclaudio@uudg.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Clark Williams <williams@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Luis Claudio Goncalves <lclaudio@uudg.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Clark Williams <williams@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Luis Claudio Goncalves <lclaudio@uudg.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Problem: when running cyclic test, short options are not parsing
optional arguments correctly when followed by a space.
"-t3" works, but "-t 3" does not.
- Fix the processing of options with optional parameters, so that the user
can write -tNUM or -t NUM and it will work as expected. This was done
for the -t and -a options
- Modify the usage messages to correspond with the way the program makes use
of the options.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Data reduction (-o mode) did not work correctly with >1 threads.
Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
I noticed I had a typo on sched_switch. I tested this on linux-tip tree
and it works there.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Darren Hart <dvhltc@us.ibm.com>
Cc: Subrata Modak <subrata@linux.vnet.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This patch has cyclictest work a bit better with ftrace. Some new options
have been added.
When -b is used:
-P : use the preemptoff tracer
-I : use the irqsoff tracer
-B : use preemptirqsoff tracer
If the above are not set, then it tries to use "events" tracer if it is
available (currently only available in the -rt kernel) and if that is not
set, it defaults to the sched-switch tracer.
-f will enabled the function tracer.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Darren Hart <dvhltc@us.ibm.com>
Cc: Subrata Modak <subrata@linux.vnet.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Not everyone mounts debugfs at /debug. This patch makes cyclictest search
for debugfs in the /proc/mounts directory.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Darren Hart <dvhltc@us.ibm.com>
Cc: Subrata Modak <subrata@linux.vnet.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
The appropriate cycle number of the maximum is now sent when in -o
mode. This is needed to more accurately determine the trace line that
is related to a particular latency.
Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
The version check in cyclic test fails if proc isn't mounted or if OS
name isn't Linux (uClinux isn't uncommon). This patch fixes both
issues.
Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
CPU affinity isn't supported by all uClibc ports right now.
Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
as of uClibc-20080416 clock_nanosleep is still not implemented.
Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
When the output of the -v option is piped into another program and if
more data are sent than the other program can eat, data points get
lost. Since high latency values normally occur much less frequently
than average latency values, the connected program will miss many of
the high latency values, and the realtime capability of a given system
may appear much better than it is.
Therefore, the new option -o RED was introduced. This option causes
cyclictest to suppress every subsequent RED number of samples and
replace them with the maximum of the values encountered during that
sampling interval.
Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
- Added support for the kernel tracer as of kernel 2.6.24
- Options mostly identical, irrespective of the kernel version
- Added check whether debug fs is mounted and tracing configured
- -v (verbose) option additionally makes tracing more verbose
Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Add CPU affinitt option to cyclictest.
1. New option -a:
without argument to a cyclictest spreads the threads consecutive on
the available CPUs. On a quad core machine we get:
-a -t4 Thread #0 -> CPU #0
Thread #1 -> CPU #1
Thread #2 -> CPU #2
Thread #3 -> CPU #3
-a -t5 Thread #0 -> CPU #0
Thread #1 -> CPU #1
Thread #2 -> CPU #2
Thread #3 -> CPU #3
Thread #4 -> CPU #0
Adding a CPU number to the -a option all threads are pinned to
the given CPU:
-a3 -t4 Thread #0 -> CPU #3
Thread #1 -> CPU #3
Thread #2 -> CPU #3
Thread #3 -> CPU #3
2. extension of the -t option:
Without argument to -t cyclictest starts as many threads as CPUs are
available.
Signed-off-by: Carsten Emde <c.emde@osadl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Sebastian Andrzej Siewior
Clark Williams
Daniel Gollub
Sven-Thorsten Dietrich
Uwe Kleine-König
Stefan Agner
Tobias Klauser
GeunSik Lim
GeunSik Lim
Uwe Kleine-König
Luis Henriques
Thomas Gleixner
Clark Williams
Luis Claudio R. Goncalves
Sven-Thorsten Dietrich
Alessio Igor Bogani
John Kacur
Carsten Emde
Steven Rostedt
Sebastian Siewior
