Before trying to parse /proc/mount, check for existance of directories
/sys/kernel/debug/tracing and /debug/tracing using stat(2).
Signed-off-by: Clark Williams <williams@redhat.com>
Only turn on ftrace_enabled if we're doing tracing that requires
the function tracer. Don't turn it on for event-based tracing. Also,
turn it off a the end of a run.
Signed-off-by: Clark Williams <williams@redhat.com>
If the tracemark_fd is >= 0, then we know we can write to the
trace_marker file. We only need to check that and not version of
the kernel or anything else at every instance of calling tracemark().
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
The -b argument is for stopping the cyclictest when it misses a wakup
by that # microseconds. Setting the tracing_thresh causes the latency tracer
to ignore any latency under tracing_thresh. These two meanings are completely
agnostic to each other, and should not be the same. We want the max latency,
that should be good enough. Not only those that are bigger than our missed
deadline. That misses most of our traces that we want.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-B is used to enable preemptirqsoff, but it also makes sense that one
could use both -I and -P together for the same thing.
Also rename the enum IRQPREEMPTOFF TO PREEMPTIRQSOFF to match the
tracer it represents and avoid confusion.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Events are available for all tracers, including function and latency
tracers. Do not treat them as a tracer. The -E option is agnostic to
the tracer options, and if it is set, then events will be enabled for
any tracer that is also set. If it is set by itself, then events will
be enabled with the nop tracer.
Also, the nop tracer is set before setting any of the tracers. This
makes the nop tracer the default as well as clears out the trace before
running the test.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
strncat writes up to n+1 chars when n is passed as 3rd argument. So when
doing
strncpy(filename, fileprefix, sizeof(filename));
strncat(filename, name, sizeof(filename) - strlen(fileprefix));
with strlen(fileprefix) + strlen(name) >= sizeof(filename) a buffer
overflow occurs. Addionally there is no check if filename is big enough.
So convert to memcpy and handle filename not being big enough.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Clark Williams <williams@redhat.com>
reworked the kernel versioning logic to handle the 3.0 kernel
and update the ftrace logic to deal with changes to the
debugfs tracing directory.
Signed-off-by: Clark Williams <williams@redhat.com>
Use setjmp/longjump to get the parent process back out of processing
loop and into forced kill mode for the child processes/threads.
Added function reset_worker_signals() so that workers (sender and
receiver) don't try to reap as well.
Signed-off-by: Clark Williams <williams@redhat.com>
When we try to run ftrace with cyclictest command of rt-test,
We view the error according to different kernel version.
We need to modify this hard coded interface.
* Directory name of each kernel version
2.6.24.7-rt23 /sys/kernel/debug/tracing/latency_hist/wakeup_latency/reset
2.6.31-rc9-rt9.1 /sys/kernel/debug/tracing/latency_hist/wakeup/reset
2.6.33.7.2-rt30 /sys/kernel/debug/tracing/latency_hist/wakeup/reset
* parsing verification: ./linux-2.6/scripts/checkpatch.pl --> OK
Signed-off-by: Geunsik Lim <geunsik.lim@samsung.com>
Reviewed-by: John Kacur <jkacur@redhat.com>
Reviewed-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Clark Williams <williams@redhat.com>
To compare histograms of several SMP machines or to gain an
overview when cyclictest is running more than a single thread,
an overall histogram is required that contains a summary of
the individual thread latencies.
This patch adds this functionality and introduces the new
option -H/--histofall for this purpose.
Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Clark Williams <williams@redhat.com>
Change type of faux sched_setaffinity to match headers.
Also add additional report info when dumping histogram.
Signed-off-by: Clark Williams <williams@redhat.com>
- don't rely on non-standard envvar PWD, use make's CURDIR instead
- allow overwriting KERNELDIR
- less repetition by conflating targets
- explicitly differentiate between kbuild and ordinary make part
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cleanup spurred by need to make the 'diff' variable in timerthread() to
be unsigned and 64-bits (rather than a signed 32-bit).
Signed-off-by: Clark Williams <williams@redhat.com>
Documented the --numa mode option to cyclictest in the man page.
Also updated the command summary to include the short options for
the --smp and --numa modes (-S and -U).
Signed-off-by: Clark Williams <williams@redhat.com>
When using a POSIX interval timer and an overrun occurs, a signal is always
lost. From then on cyclictest would report all measurements as increased by
N*period (where N is the number of overruns).
cyclictest can detect the overruns and adjust the expected time of the next
tick accordingly.
Reported-by: Marti Raudsepp <marti@juffo.org>
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: Clark Williams <williams@redhat.com>
If python is not available on the target, skip the
hwlatdetect.py installation with:
make PYLIB= DESTDIR=/some/dir install
Create PYLIB during make install with DESTDIR set
Also, the second bindir should probably be srcdir.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Clark Williams <williams@redhat.com>
After much thought, I decided to keep cyclictest's default scheduling
policy as SCHED_OTHER. My rationale is that if you don't specify a
priority on the command line you get the priorityless policy. If you
do specify a priority but no specific RT policy, we'll default to
SCHED_FIFO. So to get SCHED_RR you have to specify priorty and policy
name, for example:
# cyclictest --priority=90 --policy=rr
Yes, I realize that the vast majority of users will run it with a
realtime priority, but I just don't like picking a priority if it
wasn't specified. If you want a realtime policy, specify a priority.
Signed-off-by: Clark Williams <williams@redhat.com>
The call numa_node_to_cpus() in rt_numa_numa_node_of_cpu()
was failing because the cpumask buffer size was only 16 bytes
and it seems to require 32. Change the declaration to be 256
just for paranoia's sake.
Signed-off-by: Clark Williams <williams@redhat.com>
Since it's doing relative time sleeps probably not an issue, but
move to clock_nanosleep(CLOCK_MONOTONIC, 0,...) to be clear.
Signed-off-by: Clark Williams <williams@redhat.com>
This patch adds the program pmqtest to the rt-tests suite.
The test mechanism is the same as in ptsematest, svsematest
and friends, but it uses message queues to synchronize the
test threads. To test the - now hopefully fixed - kernel
problem that occurred when a timeout was specified, the
-T option is available.
On an 8-way machine, the test result may look like:
Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Clark Williams <williams@redhat.com>
Somewhere between 2.6.24 and 2.6.33, the tracing_on field was
added to the debugfs tracing dir. If it exists use it to turn
tracing on and off; if not use tracing_enabled.
Signed-off-by: Clark Williams <williams@redhat.com>
Clark Williams
Steven Rostedt
Uwe Kleine-König
John Kacur
Geunsik Lim
Wolfram Sang
Carsten Emde
Daniel Sangorrin
Michal Schmidt
Olaf Hering