cad9931f64
The fprobe is a wrapper API for ftrace function tracer.
Unlike kprobes, this probes only supports the function entry, but this
can probe multiple functions by one fprobe. The usage is similar, user
will set their callback to fprobe::entry_handler and call
register_fprobe*() with probed functions.
There are 3 registration interfaces,
- register_fprobe() takes filtering patterns of the functin names.
- register_fprobe_ips() takes an array of ftrace-location addresses.
- register_fprobe_syms() takes an array of function names.
The registered fprobes can be unregistered with unregister_fprobe().
e.g.
struct fprobe fp = { .entry_handler = user_handler };
const char *targets[] = { "func1", "func2", "func3"};
...
ret = register_fprobe_syms(&fp, targets, ARRAY_SIZE(targets));
...
unregister_fprobe(&fp);
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Tested-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/164735283857.1084943.1154436951479395551.stgit@devnote2
105 lines
3.5 KiB
Makefile
105 lines
3.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# Do not instrument the tracer itself:
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ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
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ifdef CONFIG_FUNCTION_TRACER
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# Avoid recursion due to instrumentation.
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KCSAN_SANITIZE := n
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ifdef CONFIG_FTRACE_SELFTEST
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# selftest needs instrumentation
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CFLAGS_trace_selftest_dynamic.o = $(CC_FLAGS_FTRACE)
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obj-y += trace_selftest_dynamic.o
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endif
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endif
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ifdef CONFIG_FTRACE_STARTUP_TEST
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CFLAGS_trace_kprobe_selftest.o = $(CC_FLAGS_FTRACE)
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obj-$(CONFIG_KPROBE_EVENTS) += trace_kprobe_selftest.o
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endif
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# If unlikely tracing is enabled, do not trace these files
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ifdef CONFIG_TRACING_BRANCHES
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KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
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endif
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# for GCOV coverage profiling
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ifdef CONFIG_GCOV_PROFILE_FTRACE
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GCOV_PROFILE := y
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endif
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CFLAGS_bpf_trace.o := -I$(src)
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CFLAGS_trace_benchmark.o := -I$(src)
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CFLAGS_trace_events_filter.o := -I$(src)
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obj-$(CONFIG_TRACE_CLOCK) += trace_clock.o
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obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
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obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
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obj-$(CONFIG_RING_BUFFER_BENCHMARK) += ring_buffer_benchmark.o
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obj-$(CONFIG_TRACING) += trace.o
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obj-$(CONFIG_TRACING) += trace_output.o
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obj-$(CONFIG_TRACING) += trace_seq.o
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obj-$(CONFIG_TRACING) += trace_stat.o
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obj-$(CONFIG_TRACING) += trace_printk.o
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obj-$(CONFIG_TRACING) += pid_list.o
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obj-$(CONFIG_TRACING_MAP) += tracing_map.o
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obj-$(CONFIG_PREEMPTIRQ_DELAY_TEST) += preemptirq_delay_test.o
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obj-$(CONFIG_SYNTH_EVENT_GEN_TEST) += synth_event_gen_test.o
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obj-$(CONFIG_KPROBE_EVENT_GEN_TEST) += kprobe_event_gen_test.o
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obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
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obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
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obj-$(CONFIG_PREEMPTIRQ_TRACEPOINTS) += trace_preemptirq.o
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obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
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obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
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obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
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obj-$(CONFIG_HWLAT_TRACER) += trace_hwlat.o
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obj-$(CONFIG_OSNOISE_TRACER) += trace_osnoise.o
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obj-$(CONFIG_NOP_TRACER) += trace_nop.o
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obj-$(CONFIG_STACK_TRACER) += trace_stack.o
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obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
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obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
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obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += fgraph.o
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ifeq ($(CONFIG_BLOCK),y)
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obj-$(CONFIG_EVENT_TRACING) += blktrace.o
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endif
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obj-$(CONFIG_EVENT_TRACING) += trace_events.o
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obj-$(CONFIG_EVENT_TRACING) += trace_export.o
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obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
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ifeq ($(CONFIG_PERF_EVENTS),y)
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obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
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endif
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obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
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obj-$(CONFIG_EVENT_TRACING) += trace_events_trigger.o
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obj-$(CONFIG_PROBE_EVENTS) += trace_eprobe.o
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obj-$(CONFIG_TRACE_EVENT_INJECT) += trace_events_inject.o
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obj-$(CONFIG_SYNTH_EVENTS) += trace_events_synth.o
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obj-$(CONFIG_HIST_TRIGGERS) += trace_events_hist.o
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obj-$(CONFIG_BPF_EVENTS) += bpf_trace.o
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obj-$(CONFIG_KPROBE_EVENTS) += trace_kprobe.o
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obj-$(CONFIG_TRACEPOINTS) += error_report-traces.o
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obj-$(CONFIG_TRACEPOINTS) += power-traces.o
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ifeq ($(CONFIG_PM),y)
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obj-$(CONFIG_TRACEPOINTS) += rpm-traces.o
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endif
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ifeq ($(CONFIG_TRACING),y)
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obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
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endif
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obj-$(CONFIG_DYNAMIC_EVENTS) += trace_dynevent.o
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obj-$(CONFIG_PROBE_EVENTS) += trace_probe.o
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obj-$(CONFIG_UPROBE_EVENTS) += trace_uprobe.o
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obj-$(CONFIG_BOOTTIME_TRACING) += trace_boot.o
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obj-$(CONFIG_FTRACE_RECORD_RECURSION) += trace_recursion_record.o
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obj-$(CONFIG_FPROBE) += fprobe.o
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obj-$(CONFIG_TRACEPOINT_BENCHMARK) += trace_benchmark.o
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libftrace-y := ftrace.o
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