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[Qemu-devel] [PATCH] trace: Multi-backend tracing
|
From: |
Lluís Vilanova |
|
Subject: |
[Qemu-devel] [PATCH] trace: Multi-backend tracing |
|
Date: |
Mon, 17 Feb 2014 20:37:53 +0100 |
|
User-agent: |
StGit/0.16 |
Adds support to compile QEMU with multiple tracing backends at the same time.
For example, you can compile QEMU with:
$ ./configure --enable-trace-backend=ftrace,dtrace
Where 'ftrace' can be handy for having an in-flight record of events, and
'dtrace' can be later used to extract more information from the system.
This patch allows having both available without recompiling QEMU.
Signed-off-by: Lluís Vilanova <address@hidden>
---
Makefile | 2 +
configure | 42 +++++++++++++---------------
qemu-io.c | 2 +
scripts/tracetool.py | 39 +++++++++++++-------------
scripts/tracetool/__init__.py | 22 +++++++--------
scripts/tracetool/backend/__init__.py | 15 +++++-----
trace/Makefile.objs | 16 +++++------
trace/control-internal.h | 4 +--
trace/control.c | 49 ++++++++++++++++++++++++++++++++-
trace/control.h | 27 +++---------------
trace/default.c | 40 ---------------------------
trace/ftrace.c | 25 +----------------
trace/ftrace.h | 5 +++
trace/simple.c | 19 +------------
trace/simple.h | 1 +
trace/stderr.c | 30 --------------------
vl.c | 4 +--
17 files changed, 130 insertions(+), 212 deletions(-)
delete mode 100644 trace/default.c
delete mode 100644 trace/stderr.c
diff --git a/Makefile b/Makefile
index 50a8e38..26ca22e 100644
--- a/Makefile
+++ b/Makefile
@@ -52,7 +52,7 @@ GENERATED_HEADERS += trace/generated-events.h
GENERATED_SOURCES += trace/generated-events.c
GENERATED_HEADERS += trace/generated-tracers.h
-ifeq ($(TRACE_BACKEND),dtrace)
+ifeq ($(findstring dtrace,$(TRACE_BACKEND)),dtrace)
GENERATED_HEADERS += trace/generated-tracers-dtrace.h
endif
GENERATED_SOURCES += trace/generated-tracers.c
diff --git a/configure b/configure
index 236764a..b65c7bd 100755
--- a/configure
+++ b/configure
@@ -129,6 +129,10 @@ path_of() {
return 1
}
+have_backend () {
+ echo "$trace_backends" | grep "$1" >/dev/null
+}
+
# default parameters
source_path=`dirname "$0"`
cpu=""
@@ -236,7 +240,7 @@ pkgversion=""
pie=""
zero_malloc=""
qom_cast_debug="yes"
-trace_backend="nop"
+trace_backends="nop"
trace_file="trace"
spice=""
rbd=""
@@ -679,7 +683,7 @@ for opt do
;;
--target-list=*) target_list="$optarg"
;;
- --enable-trace-backend=*) trace_backend="$optarg"
+ --enable-trace-backends=*) trace_backends="$optarg"
;;
--with-trace-file=*) trace_file="$optarg"
;;
@@ -3355,15 +3359,15 @@ fi
##########################################
# check if trace backend exists
-$python "$source_path/scripts/tracetool.py" "--backend=$trace_backend"
--check-backend > /dev/null 2> /dev/null
+$python "$source_path/scripts/tracetool.py" "--backends=$trace_backends"
--check-backends > /dev/null 2> /dev/null
if test "$?" -ne 0 ; then
- error_exit "invalid trace backend" \
- "Please choose a supported trace backend."
+ error_exit "invalid trace backends" \
+ "Please choose supported trace backends."
fi
##########################################
# For 'ust' backend, test if ust headers are present
-if test "$trace_backend" = "ust"; then
+if have_backend "ust"; then
cat > $TMPC << EOF
#include <ust/tracepoint.h>
#include <ust/marker.h>
@@ -3379,7 +3383,7 @@ fi
##########################################
# For 'dtrace' backend, test if 'dtrace' command is present
-if test "$trace_backend" = "dtrace"; then
+if have_backend "dtrace"; then
if ! has 'dtrace' ; then
error_exit "dtrace command is not found in PATH $PATH"
fi
@@ -3815,7 +3819,7 @@ echo "uuid support $uuid"
echo "libcap-ng support $cap_ng"
echo "vhost-net support $vhost_net"
echo "vhost-scsi support $vhost_scsi"
-echo "Trace backend $trace_backend"
+echo "Trace backends $trace_backends"
echo "Trace output file $trace_file-<pid>"
echo "spice support $spice ($spice_protocol_version/$spice_server_version)"
echo "rbd support $rbd"
@@ -4264,43 +4268,35 @@ if test "$tpm" = "yes"; then
fi
fi
-# use default implementation for tracing backend-specific routines
-trace_default=yes
-echo "TRACE_BACKEND=$trace_backend" >> $config_host_mak
-if test "$trace_backend" = "nop"; then
+echo "TRACE_BACKENDS=$trace_backends" >> $config_host_mak
+if have_backend "nop"; then
echo "CONFIG_TRACE_NOP=y" >> $config_host_mak
fi
-if test "$trace_backend" = "simple"; then
+if have_backend "simple"; then
echo "CONFIG_TRACE_SIMPLE=y" >> $config_host_mak
- trace_default=no
# Set the appropriate trace file.
trace_file="\"$trace_file-\" FMT_pid"
fi
-if test "$trace_backend" = "stderr"; then
+if have_backend "stderr"; then
echo "CONFIG_TRACE_STDERR=y" >> $config_host_mak
- trace_default=no
fi
-if test "$trace_backend" = "ust"; then
+if have_backend "ust"; then
echo "CONFIG_TRACE_UST=y" >> $config_host_mak
fi
-if test "$trace_backend" = "dtrace"; then
+if have_backend "dtrace"; then
echo "CONFIG_TRACE_DTRACE=y" >> $config_host_mak
if test "$trace_backend_stap" = "yes" ; then
echo "CONFIG_TRACE_SYSTEMTAP=y" >> $config_host_mak
fi
fi
-if test "$trace_backend" = "ftrace"; then
+if have_backend "ftrace"; then
if test "$linux" = "yes" ; then
echo "CONFIG_TRACE_FTRACE=y" >> $config_host_mak
- trace_default=no
else
feature_not_found "ftrace(trace backend)"
fi
fi
echo "CONFIG_TRACE_FILE=$trace_file" >> $config_host_mak
-if test "$trace_default" = "yes"; then
- echo "CONFIG_TRACE_DEFAULT=y" >> $config_host_mak
-fi
if test "$rdma" = "yes" ; then
echo "CONFIG_RDMA=y" >> $config_host_mak
diff --git a/qemu-io.c b/qemu-io.c
index d669028..6877f4d 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -417,7 +417,7 @@ int main(int argc, char **argv)
}
break;
case 'T':
- if (!trace_backend_init(optarg, NULL)) {
+ if (!trace_init_backends(optarg, NULL)) {
exit(1); /* error message will have been printed */
}
break;
diff --git a/scripts/tracetool.py b/scripts/tracetool.py
index 5f4890f..f798ca1 100755
--- a/scripts/tracetool.py
+++ b/scripts/tracetool.py
@@ -6,7 +6,7 @@ Command-line wrapper for the tracetool machinery.
"""
__author__ = "Lluís Vilanova <address@hidden>"
-__copyright__ = "Copyright 2012, Lluís Vilanova <address@hidden>"
+__copyright__ = "Copyright 2012-2014, Lluís Vilanova <address@hidden>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -65,16 +65,17 @@ def main(args):
global _SCRIPT
_SCRIPT = args[0]
- long_opts = [ "backend=", "format=", "help", "list-backends",
"check-backend" ]
- long_opts += [ "binary=", "target-type=", "target-name=", "probe-prefix=" ]
+ long_opts = ["backends=", "format=", "help", "list-backends",
+ "check-backends"]
+ long_opts += ["binary=", "target-type=", "target-name=", "probe-prefix="]
try:
opts, args = getopt.getopt(args[1:], "", long_opts)
except getopt.GetoptError, err:
error_opt(str(err))
- check_backend = False
- arg_backend = ""
+ check_backends = False
+ arg_backends = []
arg_format = ""
binary = None
target_type = None
@@ -84,8 +85,8 @@ def main(args):
if opt == "--help":
error_opt()
- elif opt == "--backend":
- arg_backend = arg
+ elif opt == "--backends":
+ arg_backends = arg.split(",")
elif opt == "--format":
arg_format = arg
@@ -93,8 +94,8 @@ def main(args):
public_backends = tracetool.backend.get_list(only_public = True)
out(", ".join([ b for b,_ in public_backends ]))
sys.exit(0)
- elif opt == "--check-backend":
- check_backend = True
+ elif opt == "--check-backends":
+ check_backends = True
elif opt == "--binary":
binary = arg
@@ -108,14 +109,14 @@ def main(args):
else:
error_opt("unhandled option: %s" % opt)
- if arg_backend is None:
- error_opt("backend not set")
+ if len(arg_backends) == 0:
+ error_opt("no backends specified")
- if check_backend:
- if tracetool.backend.exists(arg_backend):
- sys.exit(0)
- else:
- sys.exit(1)
+ if check_backends:
+ for backend in arg_backends:
+ if not tracetool.backend.exists(backend):
+ sys.exit(1)
+ sys.exit(0)
if arg_format == "stap":
if binary is None:
@@ -126,11 +127,11 @@ def main(args):
error_opt("--target-name is required for SystemTAP tapset
generator")
if probe_prefix is None:
- probe_prefix = ".".join([ "qemu", target_type, target_name ])
+ probe_prefix = ".".join(["qemu", target_type, target_name])
try:
- tracetool.generate(sys.stdin, arg_format, arg_backend,
- binary = binary, probe_prefix = probe_prefix)
+ tracetool.generate(sys.stdin, arg_format, arg_backends,
+ binary=binary, probe_prefix=probe_prefix)
except tracetool.TracetoolError, e:
error_opt(str(e))
diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index fd705b6..d5ba353 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -228,9 +228,9 @@ def try_import(mod_name, attr_name=None, attr_default=None):
return False, None
-def generate(fevents, format, backend,
+def generate(fevents, format, backends,
binary=None, probe_prefix=None):
- """Generate the output for the given (format, backend) pair.
+ """Generate the output for the given (format, backends) pair.
Parameters
----------
@@ -238,8 +238,8 @@ def generate(fevents, format, backend,
Event description file.
format : str
Output format name.
- backend : str
- Output backend name.
+ backends : list
+ Output backend names.
binary : str or None
See tracetool.backend.dtrace.BINARY.
probe_prefix : str or None
@@ -255,13 +255,13 @@ def generate(fevents, format, backend,
raise TracetoolError("unknown format: %s" % format)
format = format.replace("-", "_")
- backend = str(backend)
- if len(backend) is 0:
- raise TracetoolError("backend not set")
- if not tracetool.backend.exists(backend):
- raise TracetoolError("unknown backend: %s" % backend)
- backend = backend.replace("-", "_")
- backend = tracetool.backend.Wrapper(backend, format)
+ if len(backends) is 0:
+ raise TracetoolError("no backends specified")
+ for backend in backends:
+ if not tracetool.backend.exists(backend):
+ raise TracetoolError("unknown backend: %s" % backend)
+ backends = [backend.replace("-", "_") for backend in backends]
+ backend = tracetool.backend.Wrapper(backends, format)
import tracetool.backend.dtrace
tracetool.backend.dtrace.BINARY = binary
diff --git a/scripts/tracetool/backend/__init__.py
b/scripts/tracetool/backend/__init__.py
index 5e36f04..5bfa1ef 100644
--- a/scripts/tracetool/backend/__init__.py
+++ b/scripts/tracetool/backend/__init__.py
@@ -99,17 +99,18 @@ def exists(name):
class Wrapper:
- def __init__(self, backend, format):
- self._backend = backend.replace("-", "_")
+ def __init__(self, backends, format):
+ self._backends = [backend.replace("-", "_") for backend in backends]
self._format = format.replace("-", "_")
- assert exists(self._backend)
+ assert all(exists(backend) for backend in self._backends)
assert tracetool.format.exists(self._format)
def _run_function(self, name, *args, **kwargs):
- func = tracetool.try_import("tracetool.backend." + self._backend,
- name % self._format, None)[1]
- if func is not None:
- func(*args, **kwargs)
+ for backend in self._backends:
+ func = tracetool.try_import("tracetool.backend." + backend,
+ name % self._format, None)[1]
+ if func is not None:
+ func(*args, **kwargs)
def generate_begin(self, events):
self._run_function("generate_%s_begin", events)
diff --git a/trace/Makefile.objs b/trace/Makefile.objs
index 68d905b..f9dcc44 100644
--- a/trace/Makefile.objs
+++ b/trace/Makefile.objs
@@ -7,7 +7,7 @@ $(obj)/generated-events.h: $(obj)/generated-events.h-timestamp
$(obj)/generated-events.h-timestamp: $(SRC_PATH)/trace-events
$(call quiet-command,$(TRACETOOL) \
--format=events-h \
- --backend=$(TRACE_BACKEND) \
+ --backend=$(TRACE_BACKENDS) \
< $< > $@," GEN $(patsubst %-timestamp,%,$@)")
@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst
%-timestamp,%,$@)
@@ -15,7 +15,7 @@ $(obj)/generated-events.c:
$(obj)/generated-events.c-timestamp $(BUILD_DIR)/conf
$(obj)/generated-events.c-timestamp: $(SRC_PATH)/trace-events
$(call quiet-command,$(TRACETOOL) \
--format=events-c \
- --backend=$(TRACE_BACKEND) \
+ --backend=$(TRACE_BACKENDS) \
< $< > $@," GEN $(patsubst %-timestamp,%,$@)")
@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst
%-timestamp,%,$@)
@@ -30,19 +30,19 @@ $(obj)/generated-tracers.h:
$(obj)/generated-tracers.h-timestamp
$(obj)/generated-tracers.h-timestamp: $(SRC_PATH)/trace-events
$(BUILD_DIR)/config-host.mak
$(call quiet-command,$(TRACETOOL) \
--format=h \
- --backend=$(TRACE_BACKEND) \
+ --backend=$(TRACE_BACKENDS) \
< $< > $@," GEN $(patsubst %-timestamp,%,$@)")
######################################################################
# Auto-generated tracing routines (non-DTrace)
-ifneq ($(TRACE_BACKEND),dtrace)
+ifneq ($(findstring dtrace,$(TRACE_BACKENDS)),dtrace)
$(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
$(call quiet-command,$(TRACETOOL) \
--format=c \
- --backend=$(TRACE_BACKEND) \
+ --backend=$(TRACE_BACKENDS) \
< $< > $@," GEN $(patsubst %-timestamp,%,$@)")
$(obj)/generated-tracers.o: $(obj)/generated-tracers.c
$(obj)/generated-tracers.h
@@ -55,12 +55,12 @@ endif
# Normal practice is to name DTrace probe file with a '.d' extension
# but that gets picked up by QEMU's Makefile as an external dependency
# rule file. So we use '.dtrace' instead
-ifeq ($(TRACE_BACKEND),dtrace)
+ifeq ($(findstring dtrace,$(TRACE_BACKENDS)),dtrace)
$(obj)/generated-tracers.dtrace: $(obj)/generated-tracers.dtrace-timestamp
$(obj)/generated-tracers.dtrace-timestamp: $(SRC_PATH)/trace-events
$(BUILD_DIR)/config-host.mak
$(call quiet-command,$(TRACETOOL) \
--format=d \
- --backend=$(TRACE_BACKEND) \
+ --backend=$(TRACE_BACKENDS) \
< $< > $@," GEN $(patsubst %-timestamp,%,$@)")
@cmp -s $@ $(patsubst %-timestamp,%,$@) || cp $@ $(patsubst
%-timestamp,%,$@)
@@ -73,9 +73,7 @@ endif
######################################################################
# Backend code
-util-obj-$(CONFIG_TRACE_DEFAULT) += default.o
util-obj-$(CONFIG_TRACE_SIMPLE) += simple.o
-util-obj-$(CONFIG_TRACE_STDERR) += stderr.o
util-obj-$(CONFIG_TRACE_FTRACE) += ftrace.o
util-obj-y += control.o
util-obj-y += generated-tracers.o
diff --git a/trace/control-internal.h b/trace/control-internal.h
index cce2da4..f882236 100644
--- a/trace/control-internal.h
+++ b/trace/control-internal.h
@@ -1,7 +1,7 @@
/*
* Interface for configuring and controlling the state of tracing events.
*
- * Copyright (C) 2011-2012 Lluís Vilanova <address@hidden>
+ * Copyright (C) 2011-2014 Lluís Vilanova <address@hidden>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
@@ -61,7 +61,7 @@ static inline void trace_event_set_state_dynamic(TraceEvent
*ev, bool state)
{
assert(ev != NULL);
assert(trace_event_get_state_static(ev));
- return trace_event_set_state_dynamic_backend(ev, state);
+ ev->dstate = state;
}
#endif /* TRACE__CONTROL_INTERNAL_H */
diff --git a/trace/control.c b/trace/control.c
index 49f61e1..09c345c 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -1,13 +1,19 @@
/*
* Interface for configuring and controlling the state of tracing events.
*
- * Copyright (C) 2011-2012 Lluís Vilanova <address@hidden>
+ * Copyright (C) 2011-2014 Lluís Vilanova <address@hidden>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "trace/control.h"
+#ifdef CONFIG_TRACE_SIMPLE
+#include "trace/simple.h"
+#endif
+#ifdef CONFIG_TRACE_FTRACE
+#include "trace/ftrace.h"
+#endif
TraceEvent *trace_event_name(const char *name)
@@ -79,7 +85,20 @@ TraceEvent *trace_event_pattern(const char *pat, TraceEvent
*ev)
return NULL;
}
-void trace_backend_init_events(const char *fname)
+void trace_print_events(FILE *stream, fprintf_function stream_printf)
+{
+ TraceEventID i;
+
+ for (i = 0; i < trace_event_count(); i++) {
+ TraceEvent *ev = trace_event_id(i);
+ stream_printf(stream, "%s [Event ID %u] : state %u\n",
+ trace_event_get_name(ev), i,
+ trace_event_get_state_static(ev) &&
+ trace_event_get_state_dynamic(ev));
+ }
+}
+
+static void trace_init_events(const char *fname)
{
if (fname == NULL) {
return;
@@ -130,3 +149,29 @@ void trace_backend_init_events(const char *fname)
exit(1);
}
}
+
+bool trace_init_backends(const char *events, const char *file)
+{
+#ifdef CONFIG_TRACE_SIMPLE
+ if (!st_init(file)) {
+ fprintf(stderr, "failed to initialize simple tracing backend.\n");
+ return false;
+ }
+#else
+ if (file) {
+ fprintf(stderr, "error: -trace file=...: "
+ "option not supported by the selected tracing backends\n");
+ return false;
+ }
+#endif
+
+#ifdef CONFIG_TRACE_FTRACE
+ if (!ftrace_init()) {
+ fprintf(stderr, "failed to initialize ftrace backend.\n");
+ return false;
+ }
+#endif
+
+ trace_init_events(events);
+ return true;
+}
diff --git a/trace/control.h b/trace/control.h
index cde8260..e1ec033 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -1,7 +1,7 @@
/*
* Interface for configuring and controlling the state of tracing events.
*
- * Copyright (C) 2011-2012 Lluís Vilanova <address@hidden>
+ * Copyright (C) 2011-2014 Lluís Vilanova <address@hidden>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
@@ -146,26 +146,17 @@ static bool trace_event_get_state_dynamic(TraceEvent *ev);
*/
static void trace_event_set_state_dynamic(TraceEvent *ev, bool state);
-/**
- * trace_event_set_state_dynamic_backend:
- *
- * Warning: This function must be implemented by each tracing backend.
- */
-void trace_event_set_state_dynamic_backend(TraceEvent *ev, bool state);
-
/**
* trace_print_events:
*
* Print the state of all events.
- *
- * Warning: This function must be implemented by each tracing backend.
*/
void trace_print_events(FILE *stream, fprintf_function stream_printf);
/**
- * trace_backend_init:
+ * trace_init_backends:
* @events: Name of file with events to be enabled at startup; may be NULL.
* Corresponds to commandline option "-trace events=...".
* @file: Name of trace output file; may be NULL.
@@ -173,19 +164,9 @@ void trace_print_events(FILE *stream, fprintf_function
stream_printf);
*
* Initialize the tracing backend.
*
- * Warning: This function must be implemented by each tracing backend.
- *
- * Returns: Whether the backend could be successfully initialized.
- */
-bool trace_backend_init(const char *events, const char *file);
-
-/**
- * trace_backend_init_events:
- * @fname: Name of file with events to enable; may be NULL.
- *
- * Generic function to initialize the state of events.
+ * Returns: Whether the backends could be successfully initialized.
*/
-void trace_backend_init_events(const char *fname);
+bool trace_init_backends(const char *events, const char *file);
#include "trace/control-internal.h"
diff --git a/trace/default.c b/trace/default.c
deleted file mode 100644
index 6e07a47..0000000
--- a/trace/default.c
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Default implementation for backend initialization from commandline.
- *
- * Copyright (C) 2011-2012 Lluís Vilanova <address@hidden>
- *
- * This work is licensed under the terms of the GNU GPL, version 2. See
- * the COPYING file in the top-level directory.
- */
-
-#include "trace/control.h"
-
-
-void trace_print_events(FILE *stream, fprintf_function stream_printf)
-{
- fprintf(stderr, "warning: "
- "cannot print the trace events with the current backend\n");
- stream_printf(stream, "error: "
- "operation not supported with the current backend\n");
-}
-
-void trace_event_set_state_dynamic_backend(TraceEvent *ev, bool state)
-{
- fprintf(stderr, "warning: "
- "cannot set the state of a trace event with the current
backend\n");
-}
-
-bool trace_backend_init(const char *events, const char *file)
-{
- if (events) {
- fprintf(stderr, "error: -trace events=...: "
- "option not supported by the selected tracing backend\n");
- return false;
- }
- if (file) {
- fprintf(stderr, "error: -trace file=...: "
- "option not supported by the selected tracing backend\n");
- return false;
- }
- return true;
-}
diff --git a/trace/ftrace.c b/trace/ftrace.c
index 46b7fdb..a7ae371 100644
--- a/trace/ftrace.c
+++ b/trace/ftrace.c
@@ -42,35 +42,13 @@ static int find_debugfs(char *debugfs)
return 1;
}
-void trace_print_events(FILE *stream, fprintf_function stream_printf)
-{
- TraceEventID i;
-
- for (i = 0; i < trace_event_count(); i++) {
- TraceEvent *ev = trace_event_id(i);
- stream_printf(stream, "%s [Event ID %u] : state %u\n",
- trace_event_get_name(ev), i,
trace_event_get_state_dynamic(ev));
- }
-}
-
-void trace_event_set_state_dynamic_backend(TraceEvent *ev, bool state)
-{
- ev->dstate = state;
-}
-
-bool trace_backend_init(const char *events, const char *file)
+bool ftrace_init(void)
{
char debugfs[PATH_MAX];
char path[PATH_MAX];
int debugfs_found;
int trace_fd = -1;
- if (file) {
- fprintf(stderr, "error: -trace file=...: "
- "option not supported by the selected tracing backend\n");
- return false;
- }
-
debugfs_found = find_debugfs(debugfs);
if (debugfs_found) {
snprintf(path, PATH_MAX, "%s/tracing/tracing_on", debugfs);
@@ -97,6 +75,5 @@ bool trace_backend_init(const char *events, const char *file)
return false;
}
- trace_backend_init_events(events);
return true;
}
diff --git a/trace/ftrace.h b/trace/ftrace.h
index 94cb8d5..ad18ccb 100644
--- a/trace/ftrace.h
+++ b/trace/ftrace.h
@@ -1,10 +1,15 @@
#ifndef TRACE_FTRACE_H
#define TRACE_FTRACE_H
+#include <stdint.h>
+
+
#define MAX_TRACE_STRLEN 512
#define _STR(x) #x
#define STR(x) _STR(x)
extern int trace_marker_fd;
+bool ftrace_init(void);
+
#endif /* ! TRACE_FTRACE_H */
diff --git a/trace/simple.c b/trace/simple.c
index 57572c4..6f52bf1 100644
--- a/trace/simple.c
+++ b/trace/simple.c
@@ -366,22 +366,6 @@ void st_flush_trace_buffer(void)
flush_trace_file(true);
}
-void trace_print_events(FILE *stream, fprintf_function stream_printf)
-{
- unsigned int i;
-
- for (i = 0; i < trace_event_count(); i++) {
- TraceEvent *ev = trace_event_id(i);
- stream_printf(stream, "%s [Event ID %u] : state %u\n",
- trace_event_get_name(ev), i,
trace_event_get_state_dynamic(ev));
- }
-}
-
-void trace_event_set_state_dynamic_backend(TraceEvent *ev, bool state)
-{
- ev->dstate = state;
-}
-
/* Helper function to create a thread with signals blocked. Use glib's
* portable threads since QEMU abstractions cannot be used due to reentrancy in
* the tracer. Also note the signal masking on POSIX hosts so that the thread
@@ -410,7 +394,7 @@ static GThread *trace_thread_create(GThreadFunc fn)
return thread;
}
-bool trace_backend_init(const char *events, const char *file)
+bool st_init(const char *file)
{
GThread *thread;
@@ -435,7 +419,6 @@ bool trace_backend_init(const char *events, const char
*file)
}
atexit(st_flush_trace_buffer);
- trace_backend_init_events(events);
st_set_trace_file(file);
return true;
}
diff --git a/trace/simple.h b/trace/simple.h
index 5260d9a..6997996 100644
--- a/trace/simple.h
+++ b/trace/simple.h
@@ -21,6 +21,7 @@
void st_print_trace_file_status(FILE *stream, fprintf_function stream_printf);
void st_set_trace_file_enabled(bool enable);
bool st_set_trace_file(const char *file);
+bool st_init(const char *file);
void st_flush_trace_buffer(void);
typedef struct {
diff --git a/trace/stderr.c b/trace/stderr.c
deleted file mode 100644
index e212efd..0000000
--- a/trace/stderr.c
+++ /dev/null
@@ -1,30 +0,0 @@
-#include "trace.h"
-#include "trace/control.h"
-
-
-void trace_print_events(FILE *stream, fprintf_function stream_printf)
-{
- TraceEventID i;
-
- for (i = 0; i < trace_event_count(); i++) {
- TraceEvent *ev = trace_event_id(i);
- stream_printf(stream, "%s [Event ID %u] : state %u\n",
- trace_event_get_name(ev), i,
trace_event_get_state_dynamic(ev));
- }
-}
-
-void trace_event_set_state_dynamic_backend(TraceEvent *ev, bool state)
-{
- ev->dstate = state;
-}
-
-bool trace_backend_init(const char *events, const char *file)
-{
- if (file) {
- fprintf(stderr, "error: -trace file=...: "
- "option not supported by the selected tracing backend\n");
- return false;
- }
- trace_backend_init_events(events);
- return true;
-}
diff --git a/vl.c b/vl.c
index c73462e..c2d6dce 100644
--- a/vl.c
+++ b/vl.c
@@ -3880,7 +3880,7 @@ int main(int argc, char **argv, char **envp)
}
if (!is_daemonized()) {
- if (!trace_backend_init(trace_events, trace_file)) {
+ if (!trace_init_backends(trace_events, trace_file)) {
exit(1);
}
}
@@ -4382,7 +4382,7 @@ int main(int argc, char **argv, char **envp)
os_setup_post();
if (is_daemonized()) {
- if (!trace_backend_init(trace_events, trace_file)) {
+ if (!trace_init_backends(trace_events, trace_file)) {
exit(1);
}
}
- [Qemu-devel] [PATCH] trace: Multi-backend tracing,
Lluís Vilanova <=