cyclictest will only write to /sys/kernel/debug/tracing/trace_maker
if it's also setup to do tracing. This conflicts with
running cyclictest under trace-cmd.
The --tracemark option tells cyclictest to write to the
trace_marker file even when it's not doing tracing.
It can be used like this:
# trace-cmd record [...] cyclictest [...] -bX --tracemark --notrace
Signed-off-by: Luiz Capitulino <lcapitulino@xxxxxxxxxx>
---
John, I hope this is what you asked me to do.
o v3
- Rebased on top of latest devel/v0.97 (HEAD a638701)
- Add missing help text
src/cyclictest/cyclictest.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index b9571f5..4844dfa 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -202,6 +202,7 @@ static void trigger_update(struct thread_param *par, int diff, int64_t ts);
static int shutdown;
static int tracelimit = 0;
static int notrace = 0;
+static int trace_marker = 0;
static int ftrace = 0;
static int kernelversion;
static int verbose = 0;
@@ -561,6 +562,18 @@ static void debugfs_prepare(void)
fileprefix = procfileprefix;
}
+static void enable_trace_mark(void)
+{
+ if (!trace_marker)
+ return;
+
+ if (!tracelimit)
+ fatal("--tracemark requires -b\n");
+
+ debugfs_prepare();
+ open_tracemark_fd();
+}
+
static void setup_tracer(void)
{
if (!tracelimit || notrace)
@@ -1312,6 +1325,7 @@ static void display_help(int error)
"-t [NUM] --threads=NUM number of threads:\n"
" without NUM, threads = max_cpus\n"
" without -t default = 1\n"
+ " --tracemark write a trace mark when -b latency is exceeded\n"
"-T TRACE --tracer=TRACER set tracing function\n"
" configured tracers: %s\n"
"-u --unbuffered force unbuffered output for live processing\n"
@@ -1453,7 +1467,7 @@ enum option_values {
OPT_SYSTEM, OPT_SMP, OPT_THREADS, OPT_TRACER, OPT_TRIGGER,
OPT_TRIGGER_NODES, OPT_UNBUFFERED, OPT_NUMA, OPT_VERBOSE, OPT_WAKEUP,
OPT_WAKEUPRT, OPT_DBGCYCLIC, OPT_POLICY, OPT_HELP, OPT_NUMOPTS,
- OPT_ALIGNED, OPT_SECALIGNED, OPT_LAPTOP, OPT_SMI,
+ OPT_ALIGNED, OPT_SECALIGNED, OPT_LAPTOP, OPT_SMI, OPT_TRACEMARK,
};
/* Process commandline options */
@@ -1508,6 +1522,7 @@ static void process_options (int argc, char *argv[], int max_cpus)
{"spike", required_argument, NULL, OPT_TRIGGER },
{"spike-nodes", required_argument, NULL, OPT_TRIGGER_NODES },
{"threads", optional_argument, NULL, OPT_THREADS },
+ {"tracemark", no_argument, NULL, OPT_TRACEMARK },
{"tracer", required_argument, NULL, OPT_TRACER },
{"unbuffered", no_argument, NULL, OPT_UNBUFFERED },
{"numa", no_argument, NULL, OPT_NUMA },
@@ -1749,6 +1764,8 @@ static void process_options (int argc, char *argv[], int max_cpus)
fatal("--smi is not available on your arch\n");
#endif
break;
+ case OPT_TRACEMARK:
+ trace_marker = 1; break;
}
}
@@ -2184,6 +2201,8 @@ int main(int argc, char **argv)
setup_tracer();
+ enable_trace_mark();
+
if (check_timer())
warn("High resolution timers not available\n");
--
2.1.0
--
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