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authorDivya Indi <divya.indi@oracle.com>2019-11-20 22:08:39 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-11-23 03:41:08 +0300
commit89ed42495ef4a020435f2b999093bb5731eeb8b9 (patch)
tree68ef747d890a706369a7b990e398bdc73502dfd7 /samples/Kconfig
parent28879787147358e8ffcae397f11748de3dd26577 (diff)
downloadlinux-89ed42495ef4a020435f2b999093bb5731eeb8b9.tar.xz
tracing: Sample module to demonstrate kernel access to Ftrace instances.
This is a sample module to demonstrate the use of the newly introduced and exported APIs to access Ftrace instances from within the kernel. Newly introduced APIs used here - 1. Create/Lookup a trace array with the given name. struct trace_array *trace_array_get_by_name(const char *name) 2. Destroy/Remove a trace array. int trace_array_destroy(struct trace_array *tr) 4. Enable/Disable trace events: int trace_array_set_clr_event(struct trace_array *tr, const char *system, const char *event, bool enable); Exported APIs - 1. trace_printk equivalent for instances. int trace_array_printk(struct trace_array *tr, unsigned long ip, const char *fmt, ...); 2. Helper function. void trace_printk_init_buffers(void); 3. To decrement the reference counter. void trace_array_put(struct trace_array *tr) Sample output(contents of /sys/kernel/tracing/instances/sample-instance) NOTE: Tracing disabled after ~5 sec) _-----=> irqs-off / _----=> need-resched | / _---=> hardirq/softirq || / _--=> preempt-depth ||| / delay TASK-PID CPU# |||| TIMESTAMP FUNCTION | | | |||| | | sample-instance-1452 [002] .... 49.430948: simple_thread: trace_array_printk: count=0 sample-instance-1452 [002] .... 49.430951: sample_event: count value=0 at jiffies=4294716608 sample-instance-1452 [002] .... 50.454847: simple_thread: trace_array_printk: count=1 sample-instance-1452 [002] .... 50.454849: sample_event: count value=1 at jiffies=4294717632 sample-instance-1452 [002] .... 51.478748: simple_thread: trace_array_printk: count=2 sample-instance-1452 [002] .... 51.478750: sample_event: count value=2 at jiffies=4294718656 sample-instance-1452 [002] .... 52.502652: simple_thread: trace_array_printk: count=3 sample-instance-1452 [002] .... 52.502655: sample_event: count value=3 at jiffies=4294719680 sample-instance-1452 [002] .... 53.526533: simple_thread: trace_array_printk: count=4 sample-instance-1452 [002] .... 53.526535: sample_event: count value=4 at jiffies=4294720704 sample-instance-1452 [002] .... 54.550438: simple_thread: trace_array_printk: count=5 sample-instance-1452 [002] .... 55.574336: simple_thread: trace_array_printk: count=6 Link: http://lkml.kernel.org/r/1574276919-11119-3-git-send-email-divya.indi@oracle.com Reviewed-by: Aruna Ramakrishna <aruna.ramakrishna@oracle.com> Signed-off-by: Divya Indi <divya.indi@oracle.com> [ Moved to samples/ftrace ] Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'samples/Kconfig')
-rw-r--r--samples/Kconfig7
1 files changed, 7 insertions, 0 deletions
diff --git a/samples/Kconfig b/samples/Kconfig
index 65b5967dac0c..ad64b223f3d0 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -27,6 +27,13 @@ config SAMPLE_FTRACE_DIRECT
This builds an ftrace direct function example
that hooks to wake_up_process and prints the parameters.
+config SAMPLE_TRACE_ARRAY
+ tristate "Build sample module for kernel access to Ftrace instancess"
+ depends on EVENT_TRACING && m
+ help
+ This builds a module that demonstrates the use of various APIs to
+ access Ftrace instances from within the kernel.
+
config SAMPLE_KOBJECT
tristate "Build kobject examples"
help