diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-28 18:20:09 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-28 18:20:09 -0700 |
commit | c624c86615fb8aa61fa76ed8c935446d06c80e77 (patch) | |
tree | cbb84b5e8185a4c251b574d4b40ad04b6e3e59f0 /samples/trace_printk/trace-printk.c | |
parent | e55884d2c6ac3ae50e49a1f6fe38601a91181719 (diff) | |
parent | 78aebca2c955c1c5aeb48e12645e13fe3c3461f2 (diff) |
Merge tag 'trace-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing updates from Steven Rostedt:
"This is mostly clean ups and small fixes. Some of the more visible
changes are:
- The function pid code uses the event pid filtering logic
- [ku]probe events have access to current->comm
- trace_printk now has sample code
- PCI devices now trace physical addresses
- stack tracing has less unnessary functions traced"
* tag 'trace-v4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
printk, tracing: Avoiding unneeded blank lines
tracing: Use __get_str() when manipulating strings
tracing, RAS: Cleanup on __get_str() usage
tracing: Use outer () on __get_str() definition
ftrace: Reduce size of function graph entries
tracing: Have HIST_TRIGGERS select TRACING
tracing: Using for_each_set_bit() to simplify trace_pid_write()
ftrace: Move toplevel init out of ftrace_init_tracefs()
tracing/function_graph: Fix filters for function_graph threshold
tracing: Skip more functions when doing stack tracing of events
tracing: Expose CPU physical addresses (resource values) for PCI devices
tracing: Show the preempt count of when the event was called
tracing: Add trace_printk sample code
tracing: Choose static tp_printk buffer by explicit nesting count
tracing: expose current->comm to [ku]probe events
ftrace: Have set_ftrace_pid use the bitmap like events do
tracing: Move pid_list write processing into its own function
tracing: Move the pid_list seq_file functions to be global
tracing: Move filtered_pid helper functions into trace.c
tracing: Make the pid filtering helper functions global
Diffstat (limited to 'samples/trace_printk/trace-printk.c')
-rw-r--r-- | samples/trace_printk/trace-printk.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/samples/trace_printk/trace-printk.c b/samples/trace_printk/trace-printk.c new file mode 100644 index 000000000000..e9e0040ff7be --- /dev/null +++ b/samples/trace_printk/trace-printk.c @@ -0,0 +1,56 @@ +#include <linux/module.h> +#include <linux/kthread.h> +#include <linux/irq_work.h> + +/* Must not be static to force gcc to consider these non constant */ +char *trace_printk_test_global_str = + "This is a dynamic string that will use trace_puts\n"; + +char *trace_printk_test_global_str_irq = + "(irq) This is a dynamic string that will use trace_puts\n"; + +char *trace_printk_test_global_str_fmt = + "%sThis is a %s that will use trace_printk\n"; + +static struct irq_work irqwork; + +static void trace_printk_irq_work(struct irq_work *work) +{ + trace_printk("(irq) This is a static string that will use trace_bputs\n"); + trace_printk(trace_printk_test_global_str_irq); + + trace_printk("(irq) This is a %s that will use trace_bprintk()\n", + "static string"); + + trace_printk(trace_printk_test_global_str_fmt, + "(irq) ", "dynamic string"); +} + +static int __init trace_printk_init(void) +{ + init_irq_work(&irqwork, trace_printk_irq_work); + + trace_printk("This is a static string that will use trace_bputs\n"); + trace_printk(trace_printk_test_global_str); + + /* Kick off printing in irq context */ + irq_work_queue(&irqwork); + + trace_printk("This is a %s that will use trace_bprintk()\n", + "static string"); + + trace_printk(trace_printk_test_global_str_fmt, "", "dynamic string"); + + return 0; +} + +static void __exit trace_printk_exit(void) +{ +} + +module_init(trace_printk_init); +module_exit(trace_printk_exit); + +MODULE_AUTHOR("Steven Rostedt"); +MODULE_DESCRIPTION("trace-printk"); +MODULE_LICENSE("GPL"); |