has a side effect of enabling or disabling specific functions
to be traced. Echoing names of functions into this file
will limit the trace to only those functions.
+ This influences the tracers "function" and "function_graph"
+ and thus also function profiling (see "function_profile_enabled").
The functions listed in "available_filter_functions" are what
can be written into this file.
Functions listed in this file will cause the function graph
tracer to only trace these functions and the functions that
they call. (See the section "dynamic ftrace" for more details).
+ Note, set_ftrace_filter and set_ftrace_notrace still affects
+ what functions are being traced.
set_graph_notrace:
This lists the functions that ftrace has processed and can trace.
These are the function names that you can pass to
- "set_ftrace_filter" or "set_ftrace_notrace".
+ "set_ftrace_filter", "set_ftrace_notrace",
+ "set_graph_function", or "set_graph_notrace".
(See the section "dynamic ftrace" below for more details.)
dyn_ftrace_total_info:
trace_fd = open("trace_marker", WR_ONLY);
+ Note: Writing into the trace_marker file can also initiate triggers
+ that are written into /sys/kernel/tracing/events/ftrace/print/trigger
+ See "Event triggers" in Documentation/trace/events.rst and an
+ example in Documentation/trace/histogram.rst (Section 3.)
+
trace_marker_raw:
This is similar to trace_marker above, but is meant for for binary data
cmd_gensymtypes_c = \
$(CPP) -D__GENKSYMS__ $(c_flags) $< | \
$(GENKSYMS) $(if $(1), -T $(2)) \
- $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
$(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
$(if $(KBUILD_PRESERVE),-p) \
-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
endif
ifdef CONFIG_FTRACE_MCOUNT_RECORD
+ # gcc 5 supports generating the mcount tables directly
+ ifneq ($(call cc-option,-mrecord-mcount,y),y)
+ KBUILD_CFLAGS += -mrecord-mcount
+ else
+ # else do it all manually
ifdef BUILD_C_RECORDMCOUNT
ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
RECORDMCOUNT_FLAGS = -w
objtool_args += --retpoline
endif
endif
+ endif
ifdef CONFIG_MODVERSIONS
sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
$(GENKSYMS) $(if $(1), -T $(2)) \
- $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
$(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
$(if $(KBUILD_PRESERVE),-p) \
-r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
dummy-object = $(obj)/.lib_exports.o
ksyms-lds = $(dot-target).lds
-ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
-ref_prefix = EXTERN(_
-else
-ref_prefix = EXTERN(
-endif
quiet_cmd_export_list = EXPORTS $@
cmd_export_list = $(OBJDUMP) -h $< | \
- sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\
+ sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/EXTERN(\1)/p' >$(ksyms-lds);\
rm -f $(dummy-object);\
echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
$(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\