#include <linux/tracepoint.h>
DECLARE_TRACE(subsys_eventname,
- TPPROTO(int firstarg, struct task_struct *p),
- TPARGS(firstarg, p));
+ TP_PROTO(int firstarg, struct task_struct *p),
+ TP_ARGS(firstarg, p));
In subsys/file.c (where the tracing statement must be added) :
- subsys is the name of your subsystem.
- eventname is the name of the event to trace.
-- TPPROTO(int firstarg, struct task_struct *p) is the prototype of the
+- TP_PROTO(int firstarg, struct task_struct *p) is the prototype of the
function called by this tracepoint.
-- TPARGS(firstarg, p) are the parameters names, same as found in the
+- TP_ARGS(firstarg, p) are the parameters names, same as found in the
prototype.
Connecting a function (probe) to a tracepoint is done by providing a
* Probe / tracepoint example
-See the example provided in samples/tracepoints/src
+See the example provided in samples/tracepoints
-Compile them with your kernel.
+Compile them with your kernel. They are built during 'make' (not
+'make modules') when CONFIG_SAMPLE_TRACEPOINTS=m.
Run, as root :
-modprobe tracepoint-example (insmod order is not important)
-modprobe tracepoint-probe-example
-cat /proc/tracepoint-example (returns an expected error)
-rmmod tracepoint-example tracepoint-probe-example
+modprobe tracepoint-sample (insmod order is not important)
+modprobe tracepoint-probe-sample
+cat /proc/tracepoint-sample (returns an expected error)
+rmmod tracepoint-sample tracepoint-probe-sample
dmesg