b77e38aa24
This patch creates the event tracing infrastructure of ftrace. It will create the files: /debug/tracing/available_events /debug/tracing/set_event The available_events will list the trace points that have been registered with the event tracer. set_events will allow the user to enable or disable an event hook. example: # echo sched_wakeup > /debug/tracing/set_event Will enable the sched_wakeup event (if it is registered). # echo "!sched_wakeup" >> /debug/tracing/set_event Will disable the sched_wakeup event (and only that event). # echo > /debug/tracing/set_event Will disable all events (notice the '>') # cat /debug/tracing/available_events > /debug/tracing/set_event Will enable all registered event hooks. Signed-off-by: Steven Rostedt <srostedt@redhat.com>
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
#ifndef _LINUX_KERNEL_TRACE_EVENTS_H
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#define _LINUX_KERNEL_TRACE_EVENTS_H
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#include <linux/ftrace.h>
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#include "trace.h"
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struct ftrace_event_call {
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char *name;
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int enabled;
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int (*regfunc)(void);
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void (*unregfunc)(void);
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};
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#undef TPFMT
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#define TPFMT(fmt, args...) fmt "\n", ##args
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#undef DEFINE_TRACE_FMT
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#define DEFINE_TRACE_FMT(call, proto, args, fmt) \
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static void ftrace_event_##call(proto) \
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{ \
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event_trace_printk(_RET_IP_, "(" #call ") " fmt); \
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} \
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\
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static int ftrace_reg_event_##call(void) \
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{ \
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int ret; \
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\
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ret = register_trace_##call(ftrace_event_##call); \
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if (!ret) \
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pr_info("event trace: Could not activate trace point " \
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"probe to " #call); \
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return ret; \
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} \
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\
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static void ftrace_unreg_event_##call(void) \
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{ \
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unregister_trace_##call(ftrace_event_##call); \
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} \
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\
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static struct ftrace_event_call __used \
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__attribute__((section("_ftrace_events"))) event_##call = { \
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.name = #call, \
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.regfunc = ftrace_reg_event_##call, \
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.unregfunc = ftrace_unreg_event_##call, \
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}
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void event_trace_printk(unsigned long ip, const char *fmt, ...);
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extern unsigned long __start_ftrace_events[];
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extern unsigned long __stop_ftrace_events[];
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#endif /* _LINUX_KERNEL_TRACE_EVENTS_H */
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