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trace: add build framework for merging trace-events files 

Switch make rules over to use trace-events-all as the
master trace events input file. Add rule that will
construct trace-events-all from $(trace-events-y).

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 1466066426-16657-2-git-send-email-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Daniel P. Berrange 2016-06-16 09:39:47 +01:00 committed by Stefan Hajnoczi
parent dcdaadb6ea
commit 1412cf58be
7 changed files with 45 additions and 33 deletions
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1
.gitignore vendored
View File

@ -5,6 +5,7 @@
/config-target.*
/config.status
/config-temp
/trace-events-all
/trace/generated-tracers.h
/trace/generated-tracers.c
/trace/generated-tracers-dtrace.h

2
Makefile
View File

@ -487,7 +487,7 @@ endif
set -e; for x in $(KEYMAPS); do \
$(INSTALL_DATA) $(SRC_PATH)/pc-bios/keymaps/$$x "$(DESTDIR)$(qemu_datadir)/keymaps"; \
done
$(INSTALL_DATA) $(SRC_PATH)/trace-events "$(DESTDIR)$(qemu_datadir)/trace-events"
$(INSTALL_DATA) $(BUILD_DIR)/trace-events-all "$(DESTDIR)$(qemu_datadir)/trace-events-all"
for d in $(TARGET_DIRS); do \
$(MAKE) $(SUBDIR_MAKEFLAGS) TARGET_DIR=$$d/ -C $$d $@ || exit 1 ; \
done

4
Makefile.objs
View File

@ -115,3 +115,7 @@ qga-vss-dll-obj-y = qga/
# contrib
ivshmem-client-obj-y = contrib/ivshmem-client/
ivshmem-server-obj-y = contrib/ivshmem-server/
######################################################################
trace-events-y = trace-events

6
Makefile.target
View File

@ -48,7 +48,7 @@ else
TARGET_TYPE=system
endif
$(QEMU_PROG).stp-installed: $(SRC_PATH)/trace-events
$(QEMU_PROG).stp-installed: $(BUILD_DIR)/trace-events-all
$(call quiet-command,$(TRACETOOL) \
--format=stap \
--backends=$(TRACE_BACKENDS) \
@ -57,7 +57,7 @@ $(QEMU_PROG).stp-installed: $(SRC_PATH)/trace-events
--target-type=$(TARGET_TYPE) \
< $< > $@," GEN $(TARGET_DIR)$(QEMU_PROG).stp-installed")
$(QEMU_PROG).stp: $(SRC_PATH)/trace-events
$(QEMU_PROG).stp: $(BUILD_DIR)/trace-events-all
$(call quiet-command,$(TRACETOOL) \
--format=stap \
--backends=$(TRACE_BACKENDS) \
@ -66,7 +66,7 @@ $(QEMU_PROG).stp: $(SRC_PATH)/trace-events
--target-type=$(TARGET_TYPE) \
< $< > $@," GEN $(TARGET_DIR)$(QEMU_PROG).stp")
$(QEMU_PROG)-simpletrace.stp: $(SRC_PATH)/trace-events
$(QEMU_PROG)-simpletrace.stp: $(BUILD_DIR)/trace-events-all
$(call quiet-command,$(TRACETOOL) \
--format=simpletrace-stap \
--backends=$(TRACE_BACKENDS) \

32
docs/tracing.txt
View File

@ -23,20 +23,24 @@ for debugging, profiling, and observing execution.
4. Pretty-print the binary trace file:
./scripts/simpletrace.py trace-events trace-* # Override * with QEMU <pid>
./scripts/simpletrace.py trace-events-all trace-* # Override * with QEMU <pid>
== Trace events ==
There is a set of static trace events declared in the "trace-events" source
file. Each trace event declaration names the event, its arguments, and the
format string which can be used for pretty-printing:
Each directory in the source tree can declare a set of static trace events
in a "trace-events" file. Each trace event declaration names the event, its
arguments, and the format string which can be used for pretty-printing:
qemu_vmalloc(size_t size, void *ptr) "size %zu ptr %p"
qemu_vfree(void *ptr) "ptr %p"
The "trace-events" file is processed by the "tracetool" script during build to
generate code for the trace events. Trace events are invoked directly from
source code like this:
All "trace-events" files must be listed in the "trace-event-y" make variable
in the top level Makefile.objs. During build the individual files are combined
to create a "trace-events-all" file, which is processed by the "tracetool"
script during build to generate code for the trace events. The
"trace-events-all" file is also installed into "/usr/share/qemu".
Trace events are invoked directly from source code like this:
#include "trace.h" /* needed for trace event prototype */
@ -196,12 +200,12 @@ Restriction: "ftrace" backend is restricted to Linux only.
==== Analyzing trace files ====
The "simple" backend produces binary trace files that can be formatted with the
simpletrace.py script. The script takes the "trace-events" file and the binary
trace:
simpletrace.py script. The script takes the "trace-events-all" file and the
binary trace:
./scripts/simpletrace.py trace-events trace-12345
./scripts/simpletrace.py trace-events-all trace-12345
You must ensure that the same "trace-events" file was used to build QEMU,
You must ensure that the same "trace-events-all" file was used to build QEMU,
otherwise trace event declarations may have changed and output will not be
consistent.
@ -259,11 +263,11 @@ probes:
--binary path/to/qemu-binary \
--target-type system \
--target-name x86_64 \
<trace-events >qemu.stp
<trace-events-all >qemu.stp
== Trace event properties ==
Each event in the "trace-events" file can be prefixed with a space-separated
Each event in the "trace-events-all" file can be prefixed with a space-separated
list of zero or more of the following event properties.
=== "disable" ===
@ -275,7 +279,7 @@ programmatically disabled.
In this case you should declare such event with the "disable" property. This
will effectively disable the event at compile time (by using the "nop" backend),
thus having no performance impact at all on regular builds (i.e., unless you
edit the "trace-events" file).
edit the "trace-events-all" file).
In addition, there might be cases where relatively complex computations must be
performed to generate values that are only used as arguments for a trace

8
qemu-options.hx
View File

@ -3677,8 +3677,8 @@ Specify tracing options.
@table @option
@item [enable=]@var{pattern}
Immediately enable events matching @var{pattern}.
The file must contain one event name (as listed in the @file{trace-events} file)
per line; globbing patterns are accepted too. This option is only
The file must contain one event name (as listed in the @file{trace-events-all}
file) per line; globbing patterns are accepted too. This option is only
available if QEMU has been compiled with the @var{simple}, @var{stderr}
or @var{ftrace} tracing backend. To specify multiple events or patterns,
specify the @option{-trace} option multiple times.
@ -3687,8 +3687,8 @@ Use @code{-trace help} to print a list of names of trace points.
@item events=@var{file}
Immediately enable events listed in @var{file}.
The file must contain one event name (as listed in the @file{trace-events} file)
per line; globbing patterns are accepted too. This option is only
The file must contain one event name (as listed in the @file{trace-events-all}
file) per line; globbing patterns are accepted too. This option is only
available if QEMU has been compiled with the @var{simple}, @var{stderr} or
@var{ftrace} tracing backend.

25
trace/Makefile.objs
View File

@ -8,13 +8,16 @@
tracetool-y = $(SRC_PATH)/scripts/tracetool.py
tracetool-y += $(shell find $(SRC_PATH)/scripts/tracetool -name "*.py")
$(BUILD_DIR)/trace-events-all: $(trace-events-y:%=$(SRC_PATH)/%)
$(call quiet-command,cat $^ > $@)
######################################################################
# Auto-generated event descriptions for LTTng ust code
ifeq ($(findstring ust,$(TRACE_BACKENDS)),ust)
$(obj)/generated-ust-provider.h: $(obj)/generated-ust-provider.h-timestamp
@cmp $< $@ >/dev/null 2>&1 || cp $< $@
$(obj)/generated-ust-provider.h-timestamp: $(SRC_PATH)/trace-events $(tracetool-y)
$(obj)/generated-ust-provider.h-timestamp: $(BUILD_DIR)/trace-events-all $(tracetool-y)
$(call quiet-command,$(TRACETOOL) \
--format=ust-events-h \
--backends=$(TRACE_BACKENDS) \
@ -22,7 +25,7 @@ $(obj)/generated-ust-provider.h-timestamp: $(SRC_PATH)/trace-events $(tracetool-
$(obj)/generated-ust.c: $(obj)/generated-ust.c-timestamp $(BUILD_DIR)/config-host.mak
@cmp $< $@ >/dev/null 2>&1 || cp $< $@
$(obj)/generated-ust.c-timestamp: $(SRC_PATH)/trace-events $(tracetool-y)
$(obj)/generated-ust.c-timestamp: $(BUILD_DIR)/trace-events-all $(tracetool-y)
$(call quiet-command,$(TRACETOOL) \
--format=ust-events-c \
--backends=$(TRACE_BACKENDS) \
@ -37,7 +40,7 @@ endif
$(obj)/generated-events.h: $(obj)/generated-events.h-timestamp
@cmp $< $@ >/dev/null 2>&1 || cp $< $@
$(obj)/generated-events.h-timestamp: $(SRC_PATH)/trace-events $(tracetool-y)
$(obj)/generated-events.h-timestamp: $(BUILD_DIR)/trace-events-all $(tracetool-y)
$(call quiet-command,$(TRACETOOL) \
--format=events-h \
--backends=$(TRACE_BACKENDS) \
@ -45,7 +48,7 @@ $(obj)/generated-events.h-timestamp: $(SRC_PATH)/trace-events $(tracetool-y)
$(obj)/generated-events.c: $(obj)/generated-events.c-timestamp $(BUILD_DIR)/config-host.mak
@cmp $< $@ >/dev/null 2>&1 || cp $< $@
$(obj)/generated-events.c-timestamp: $(SRC_PATH)/trace-events $(tracetool-y)
$(obj)/generated-events.c-timestamp: $(BUILD_DIR)/trace-events-all $(tracetool-y)
$(call quiet-command,$(TRACETOOL) \
--format=events-c \
--backends=$(TRACE_BACKENDS) \
@ -62,7 +65,7 @@ util-obj-y += generated-events.o
$(obj)/generated-tracers.h: $(obj)/generated-tracers.h-timestamp
@cmp -s $< $@ || cp $< $@
$(obj)/generated-tracers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(obj)/generated-tracers.h-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(call quiet-command,$(TRACETOOL) \
--format=h \
--backends=$(TRACE_BACKENDS) \
@ -73,7 +76,7 @@ $(obj)/generated-tracers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/conf
$(obj)/generated-tracers.c: $(obj)/generated-tracers.c-timestamp
@cmp -s $< $@ || cp $< $@
$(obj)/generated-tracers.c-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(obj)/generated-tracers.c-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(call quiet-command,$(TRACETOOL) \
--format=c \
--backends=$(TRACE_BACKENDS) \
@ -90,7 +93,7 @@ $(obj)/generated-tracers.o: $(obj)/generated-tracers.c $(obj)/generated-tracers.
ifeq ($(findstring dtrace,$(TRACE_BACKENDS)),dtrace)
$(obj)/generated-tracers-dtrace.dtrace: $(obj)/generated-tracers-dtrace.dtrace-timestamp
@cmp $< $@ >/dev/null 2>&1 || cp $< $@
$(obj)/generated-tracers-dtrace.dtrace-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(obj)/generated-tracers-dtrace.dtrace-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(call quiet-command,$(TRACETOOL) \
--format=d \
--backends=$(TRACE_BACKENDS) \
@ -109,7 +112,7 @@ endif
$(obj)/generated-helpers-wrappers.h: $(obj)/generated-helpers-wrappers.h-timestamp
@cmp $< $@ >/dev/null 2>&1 || cp $< $@
$(obj)/generated-helpers-wrappers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(obj)/generated-helpers-wrappers.h-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(call quiet-command,$(TRACETOOL) \
--format=tcg-helper-wrapper-h \
--backend=$(TRACE_BACKENDS) \
@ -117,7 +120,7 @@ $(obj)/generated-helpers-wrappers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_
$(obj)/generated-helpers.h: $(obj)/generated-helpers.h-timestamp
@cmp $< $@ >/dev/null 2>&1 || cp $< $@
$(obj)/generated-helpers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(obj)/generated-helpers.h-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(call quiet-command,$(TRACETOOL) \
--format=tcg-helper-h \
--backend=$(TRACE_BACKENDS) \
@ -125,7 +128,7 @@ $(obj)/generated-helpers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/conf
$(obj)/generated-helpers.c: $(obj)/generated-helpers.c-timestamp
@cmp $< $@ >/dev/null 2>&1 || cp $< $@
$(obj)/generated-helpers.c-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(obj)/generated-helpers.c-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(call quiet-command,$(TRACETOOL) \
--format=tcg-helper-c \
--backend=$(TRACE_BACKENDS) \
@ -138,7 +141,7 @@ target-obj-y += generated-helpers.o
$(obj)/generated-tcg-tracers.h: $(obj)/generated-tcg-tracers.h-timestamp
@cmp $< $@ >/dev/null 2>&1 || cp $< $@
$(obj)/generated-tcg-tracers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(obj)/generated-tcg-tracers.h-timestamp: $(BUILD_DIR)/trace-events-all $(BUILD_DIR)/config-host.mak $(tracetool-y)
$(call quiet-command,$(TRACETOOL) \
--format=tcg-h \
--backend=$(TRACE_BACKENDS) \