[PULL 0/5] Tracing patches

[PULL 0/5] Tracing patches

[Stefan Hajnoczi]

The following changes since commit 41192db338588051f21501abc13743e62b0a5605:

  Merge remote-tracking branch 'remotes/ehabkost-gl/tags/machine-next-pull-request' into staging (2021-01-01 22:57:15 +0000)

are available in the Git repository at:

  https://gitlab.com/stefanha/qemu.git tags/tracing-pull-request

for you to fetch changes up to 7fb48c0ee1bbf5cc4c905e900b054096250e9f39:

  tracetool: show trace-events filename/lineno in fmt string errors (2021-01-04 14:24:58 +0000)

----------------------------------------------------------------
Pull request

Show trace-events filename/lineno in fmt string errors and send -d trace:help
output to stdout for consistency.

----------------------------------------------------------------

Doug Evans (1):
  trace: Send "-d trace:help" output to stdout

Stefan Hajnoczi (4):
  tracetool: add output filename command-line argument
  tracetool: add out_lineno and out_next_lineno to out()
  tracetool: add input filename and line number to Event
  tracetool: show trace-events filename/lineno in fmt string errors

 docs/devel/tracing.txt              |  3 +-
 meson.build                         |  3 +-
 trace/control.h                     |  3 +-
 trace/control.c                     | 12 +++----
 scripts/tracetool.py                | 12 ++++---
 scripts/tracetool/__init__.py       | 53 +++++++++++++++++++++++++----
 scripts/tracetool/backend/ftrace.py |  4 +++
 scripts/tracetool/backend/log.py    |  4 +++
 scripts/tracetool/backend/syslog.py |  4 +++
 trace/meson.build                   | 21 ++++--------
 10 files changed, 83 insertions(+), 36 deletions(-)

-- 
2.29.2

[PULL 1/5] trace: Send "-d trace:help" output to stdout

[Stefan Hajnoczi]

From: Doug Evans <dje@google.com>

... for consistency with "-d help".

Signed-off-by: Doug Evans <dje@google.com>
Message-id: 20201125215245.3514695-1-dje@google.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 trace/control.h |  3 ++-
 trace/control.c | 12 ++++++------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/trace/control.h b/trace/control.h
index 05b95ea453..9522a7b318 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -201,10 +201,11 @@ void trace_fini_vcpu(CPUState *vcpu);
 
 /**
  * trace_list_events:
+ * @f: Where to send output.
  *
  * List all available events.
  */
-void trace_list_events(void);
+void trace_list_events(FILE *f);
 
 /**
  * trace_enable_events:
diff --git a/trace/control.c b/trace/control.c
index b82fb87316..cd04dd4e0c 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -125,18 +125,18 @@ TraceEvent *trace_event_iter_next(TraceEventIter *iter)
     return NULL;
 }
 
-void trace_list_events(void)
+void trace_list_events(FILE *f)
 {
     TraceEventIter iter;
     TraceEvent *ev;
     trace_event_iter_init(&iter, NULL);
     while ((ev = trace_event_iter_next(&iter)) != NULL) {
-        fprintf(stderr, "%s\n", trace_event_get_name(ev));
+        fprintf(f, "%s\n", trace_event_get_name(ev));
     }
 #ifdef CONFIG_TRACE_DTRACE
-    fprintf(stderr, "This list of names of trace points may be incomplete "
-                    "when using the DTrace/SystemTap backends.\n"
-                    "Run 'qemu-trace-stap list %s' to print the full list.\n",
+    fprintf(f, "This list of names of trace points may be incomplete "
+               "when using the DTrace/SystemTap backends.\n"
+               "Run 'qemu-trace-stap list %s' to print the full list.\n",
             error_get_progname());
 #endif
 }
@@ -176,7 +176,7 @@ static void do_trace_enable_events(const char *line_buf)
 void trace_enable_events(const char *line_buf)
 {
     if (is_help_option(line_buf)) {
-        trace_list_events();
+        trace_list_events(stdout);
         if (monitor_cur() == NULL) {
             exit(0);
         }
-- 
2.29.2

[PULL 2/5] tracetool: add output filename command-line argument

[Stefan Hajnoczi]

The tracetool.py script writes to stdout. This means the output filename
is not available to the script. Add the output filename to the
command-line so that the script has access to the filename.

This also simplifies the tracetool.py invocation. It's no longer
necessary to use meson's custom_build(capture : true) to save output.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20200827142915.108730-2-stefanha@redhat.com>
---
 docs/devel/tracing.txt        |  3 ++-
 meson.build                   |  3 +--
 scripts/tracetool.py          | 12 +++++++-----
 scripts/tracetool/__init__.py | 18 ++++++++++++++++--
 trace/meson.build             | 21 +++++++--------------
 5 files changed, 33 insertions(+), 24 deletions(-)

diff --git a/docs/devel/tracing.txt b/docs/devel/tracing.txt
index d2160655b4..dba43fc7a4 100644
--- a/docs/devel/tracing.txt
+++ b/docs/devel/tracing.txt
@@ -318,7 +318,8 @@ probes:
                          --target-type system \
                          --target-name x86_64 \
                          --group=all \
-                         trace-events-all >qemu.stp
+                         trace-events-all \
+                         qemu.stp
 
 To facilitate simple usage of systemtap where there merely needs to be printf
 logging of certain probes, a helper script "qemu-trace-stap" is provided.
diff --git a/meson.build b/meson.build
index 372576f82c..4a92213231 100644
--- a/meson.build
+++ b/meson.build
@@ -1901,7 +1901,6 @@ foreach target : target_dirs
         custom_target(exe['name'] + stp['ext'],
                       input: trace_events_all,
                       output: exe['name'] + stp['ext'],
-                      capture: true,
                       install: stp['install'],
                       install_dir: get_option('datadir') / 'systemtap/tapset',
                       command: [
@@ -1910,7 +1909,7 @@ foreach target : target_dirs
                         '--target-name=' + target_name,
                         '--target-type=' + target_type,
                         '--probe-prefix=qemu.' + target_type + '.' + target_name,
-                        '@INPUT@',
+                        '@INPUT@', '@OUTPUT@'
                       ])
       endforeach
     endif
diff --git a/scripts/tracetool.py b/scripts/tracetool.py
index 31146242b7..ab7653a5ce 100755
--- a/scripts/tracetool.py
+++ b/scripts/tracetool.py
@@ -16,7 +16,7 @@ __email__      = "stefanha@redhat.com"
 import sys
 import getopt
 
-from tracetool import error_write, out
+from tracetool import error_write, out, out_open
 import tracetool.backend
 import tracetool.format
 
@@ -32,7 +32,7 @@ def error_opt(msg = None):
     format_descr = "\n".join([ "    %-15s %s" % (n, d)
                                for n,d in tracetool.format.get_list() ])
     error_write("""\
-Usage: %(script)s --format=<format> --backends=<backends> [<options>]
+Usage: %(script)s --format=<format> --backends=<backends> [<options>] <trace-events> ... <output>
 
 Backends:
 %(backends)s
@@ -135,13 +135,15 @@ def main(args):
         if probe_prefix is None:
             probe_prefix = ".".join(["qemu", target_type, target_name])
 
-    if len(args) < 1:
-        error_opt("missing trace-events filepath")
+    if len(args) < 2:
+        error_opt("missing trace-events and output filepaths")
     events = []
-    for arg in args:
+    for arg in args[:-1]:
         with open(arg, "r") as fh:
             events.extend(tracetool.read_events(fh, arg))
 
+    out_open(args[-1])
+
     try:
         tracetool.generate(events, arg_group, arg_format, arg_backends,
                            binary=binary, probe_prefix=probe_prefix)
diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index 3ee54be223..a6013389a0 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -31,14 +31,28 @@ def error(*lines):
     sys.exit(1)
 
 
+out_filename = '<none>'
+out_fobj = sys.stdout
+
+def out_open(filename):
+    global out_filename, out_fobj
+    out_filename = filename
+    out_fobj = open(filename, 'wt')
+
 def out(*lines, **kwargs):
     """Write a set of output lines.
 
     You can use kwargs as a shorthand for mapping variables when formatting all
     the strings in lines.
+
+    The 'out_filename' kwarg is automatically added with the output filename.
     """
-    lines = [ l % kwargs for l in lines ]
-    sys.stdout.writelines("\n".join(lines) + "\n")
+    output = []
+    for l in lines:
+        kwargs['out_filename'] = out_filename
+        output.append(l % kwargs)
+
+    out_fobj.writelines("\n".join(output) + "\n")
 
 # We only want to allow standard C types or fixed sized
 # integer types. We don't want QEMU specific types
diff --git a/trace/meson.build b/trace/meson.build
index 843ea14495..8569e8a0c4 100644
--- a/trace/meson.build
+++ b/trace/meson.build
@@ -11,20 +11,17 @@ foreach dir : [ '.' ] + trace_events_subdirs
   trace_h = custom_target(fmt.format('trace', 'h'),
                           output: fmt.format('trace', 'h'),
                           input: trace_events_file,
-                          command: [ tracetool, group, '--format=h', '@INPUT@' ],
-                          capture: true)
+                          command: [ tracetool, group, '--format=h', '@INPUT@', '@OUTPUT@' ])
   genh += trace_h
   trace_c = custom_target(fmt.format('trace', 'c'),
                           output: fmt.format('trace', 'c'),
                           input: trace_events_file,
-                          command: [ tracetool, group, '--format=c', '@INPUT@' ],
-                          capture: true)
+                          command: [ tracetool, group, '--format=c', '@INPUT@', '@OUTPUT@' ])
   if 'CONFIG_TRACE_UST' in config_host
     trace_ust_h = custom_target(fmt.format('trace-ust', 'h'),
                                 output: fmt.format('trace-ust', 'h'),
                                 input: trace_events_file,
-                                command: [ tracetool, group, '--format=ust-events-h', '@INPUT@' ],
-                                capture: true)
+                                command: [ tracetool, group, '--format=ust-events-h', '@INPUT@', '@OUTPUT@' ])
     trace_ss.add(trace_ust_h, lttng, urcubp)
     genh += trace_ust_h
   endif
@@ -33,8 +30,7 @@ foreach dir : [ '.' ] + trace_events_subdirs
     trace_dtrace = custom_target(fmt.format('trace-dtrace', 'dtrace'),
                                  output: fmt.format('trace-dtrace', 'dtrace'),
                                  input: trace_events_file,
-                                 command: [ tracetool, group, '--format=d', '@INPUT@' ],
-                                 capture: true)
+                                 command: [ tracetool, group, '--format=d', '@INPUT@', '@OUTPUT@' ])
     trace_dtrace_h = custom_target(fmt.format('trace-dtrace', 'h'),
                                    output: fmt.format('trace-dtrace', 'h'),
                                    input: trace_dtrace,
@@ -69,8 +65,7 @@ foreach d : [
   gen = custom_target(d[0],
                 output: d[0],
                 input: meson.source_root() / 'trace-events',
-                command: [ tracetool, '--group=root', '--format=@0@'.format(d[1]), '@INPUT@' ],
-                capture: true)
+                command: [ tracetool, '--group=root', '--format=@0@'.format(d[1]), '@INPUT@', '@OUTPUT@' ])
   specific_ss.add(gen)
 endforeach
 
@@ -78,13 +73,11 @@ if 'CONFIG_TRACE_UST' in config_host
   trace_ust_all_h = custom_target('trace-ust-all.h',
                                   output: 'trace-ust-all.h',
                                   input: trace_events_files,
-                                  command: [ tracetool, '--group=all', '--format=ust-events-h', '@INPUT@' ],
-                                  capture: true)
+                                  command: [ tracetool, '--group=all', '--format=ust-events-h', '@INPUT@', '@OUTPUT@' ])
   trace_ust_all_c = custom_target('trace-ust-all.c',
                                   output: 'trace-ust-all.c',
                                   input: trace_events_files,
-                                  command: [ tracetool, '--group=all', '--format=ust-events-c', '@INPUT@' ],
-                                  capture: true)
+                                  command: [ tracetool, '--group=all', '--format=ust-events-c', '@INPUT@', '@OUTPUT@' ])
   trace_ss.add(trace_ust_all_h, trace_ust_all_c)
   genh += trace_ust_all_h
 endif
-- 
2.29.2

[PULL 3/5] tracetool: add out_lineno and out_next_lineno to out()

[Stefan Hajnoczi]

Make the output file line number and next line number available to
out().

A later patch will use this to improve error messages.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20200827142915.108730-3-stefanha@redhat.com>
---
 scripts/tracetool/__init__.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index a6013389a0..da5004ea45 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -31,6 +31,7 @@ def error(*lines):
     sys.exit(1)
 
 
+out_lineno = 1
 out_filename = '<none>'
 out_fobj = sys.stdout
 
@@ -45,12 +46,19 @@ def out(*lines, **kwargs):
     You can use kwargs as a shorthand for mapping variables when formatting all
     the strings in lines.
 
-    The 'out_filename' kwarg is automatically added with the output filename.
+    The 'out_lineno' kwarg is automatically added to reflect the current output
+    file line number. The 'out_next_lineno' kwarg is also automatically added
+    with the next output line number. The 'out_filename' kwarg is automatically
+    added with the output filename.
     """
+    global out_lineno
     output = []
     for l in lines:
+        kwargs['out_lineno'] = out_lineno
+        kwargs['out_next_lineno'] = out_lineno + 1
         kwargs['out_filename'] = out_filename
         output.append(l % kwargs)
+        out_lineno += 1
 
     out_fobj.writelines("\n".join(output) + "\n")
 
-- 
2.29.2

[PULL 4/5] tracetool: add input filename and line number to Event

[Stefan Hajnoczi]

Store the input filename and line number in Event.

A later patch will use this to improve error messages.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20200827142915.108730-4-stefanha@redhat.com>
---
 scripts/tracetool/__init__.py | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index da5004ea45..96b1cd69a5 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -218,6 +218,10 @@ class Event(object):
         Properties of the event.
     args : Arguments
         The event arguments.
+    lineno : int
+        The line number in the input file.
+    filename : str
+        The path to the input file.
 
     """
 
@@ -230,7 +234,7 @@ class Event(object):
 
     _VALID_PROPS = set(["disable", "tcg", "tcg-trans", "tcg-exec", "vcpu"])
 
-    def __init__(self, name, props, fmt, args, orig=None,
+    def __init__(self, name, props, fmt, args, lineno, filename, orig=None,
                  event_trans=None, event_exec=None):
         """
         Parameters
@@ -243,6 +247,10 @@ class Event(object):
             Event printing format string(s).
         args : Arguments
             Event arguments.
+        lineno : int
+            The line number in the input file.
+        filename : str
+            The path to the input file.
         orig : Event or None
             Original Event before transformation/generation.
         event_trans : Event or None
@@ -255,6 +263,8 @@ class Event(object):
         self.properties = props
         self.fmt = fmt
         self.args = args
+        self.lineno = int(lineno)
+        self.filename = str(filename)
         self.event_trans = event_trans
         self.event_exec = event_exec
 
@@ -276,16 +286,21 @@ class Event(object):
     def copy(self):
         """Create a new copy."""
         return Event(self.name, list(self.properties), self.fmt,
-                     self.args.copy(), self, self.event_trans, self.event_exec)
+                     self.args.copy(), self.lineno, self.filename,
+                     self, self.event_trans, self.event_exec)
 
     @staticmethod
-    def build(line_str):
+    def build(line_str, lineno, filename):
         """Build an Event instance from a string.
 
         Parameters
         ----------
         line_str : str
             Line describing the event.
+        lineno : int
+            Line number in input file.
+        filename : str
+            Path to input file.
         """
         m = Event._CRE.match(line_str)
         assert m is not None
@@ -315,7 +330,7 @@ class Event(object):
         if "tcg" in props and isinstance(fmt, str):
             raise ValueError("Events with 'tcg' property must have two format strings")
 
-        event = Event(name, props, fmt, args)
+        event = Event(name, props, fmt, args, lineno, filename)
 
         # add implicit arguments when using the 'vcpu' property
         import tracetool.vcpu
@@ -360,6 +375,8 @@ class Event(object):
                      list(self.properties),
                      self.fmt,
                      self.args.transform(*trans),
+                     self.lineno,
+                     self.filename,
                      self)
 
 
@@ -386,7 +403,7 @@ def read_events(fobj, fname):
             continue
 
         try:
-            event = Event.build(line)
+            event = Event.build(line, lineno, fname)
         except ValueError as e:
             arg0 = 'Error at %s:%d: %s' % (fname, lineno, e.args[0])
             e.args = (arg0,) + e.args[1:]
-- 
2.29.2

[PULL 5/5] tracetool: show trace-events filename/lineno in fmt string errors

[Stefan Hajnoczi]

The compiler encounters trace event format strings in generated code.
Format strings are error-prone and therefore clear compiler errors are
important.

Use the #line directive to show the trace-events filename and line
number in format string errors:
https://gcc.gnu.org/onlinedocs/gcc-10.2.0/cpp/Line-Control.html

For example, if the cpu_in trace event's %u is changed to %p the
following error is reported:

  trace-events:29:18: error: format ‘%p’ expects argument of type ‘void *’, but argument 7 has type ‘unsigned int’ [-Werror=format=]

Line 29 in trace-events is where cpu_in is defined. This works for any
trace-events file in the QEMU source tree and the correct path is
displayed.

Unfortunately there does not seem to be a way to set the column, so "18"
is not the right character on that line.

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20200827142915.108730-5-stefanha@redhat.com>
---
 scripts/tracetool/backend/ftrace.py | 4 ++++
 scripts/tracetool/backend/log.py    | 4 ++++
 scripts/tracetool/backend/syslog.py | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/scripts/tracetool/backend/ftrace.py b/scripts/tracetool/backend/ftrace.py
index e9844dd335..5fa30ccc08 100644
--- a/scripts/tracetool/backend/ftrace.py
+++ b/scripts/tracetool/backend/ftrace.py
@@ -33,8 +33,10 @@ def generate_h(event, group):
         '        int unused __attribute__ ((unused));',
         '        int trlen;',
         '        if (trace_event_get_state(%(event_id)s)) {',
+        '#line %(event_lineno)d "%(event_filename)s"',
         '            trlen = snprintf(ftrace_buf, MAX_TRACE_STRLEN,',
         '                             "%(name)s " %(fmt)s "\\n" %(argnames)s);',
+        '#line %(out_next_lineno)d "%(out_filename)s"',
         '            trlen = MIN(trlen, MAX_TRACE_STRLEN - 1);',
         '            unused = write(trace_marker_fd, ftrace_buf, trlen);',
         '        }',
@@ -42,6 +44,8 @@ def generate_h(event, group):
         name=event.name,
         args=event.args,
         event_id="TRACE_" + event.name.upper(),
+        event_lineno=event.lineno,
+        event_filename=event.filename,
         fmt=event.fmt.rstrip("\n"),
         argnames=argnames)
 
diff --git a/scripts/tracetool/backend/log.py b/scripts/tracetool/backend/log.py
index 877222bbe9..bc43dbb4f4 100644
--- a/scripts/tracetool/backend/log.py
+++ b/scripts/tracetool/backend/log.py
@@ -37,12 +37,16 @@ def generate_h(event, group):
     out('    if (%(cond)s && qemu_loglevel_mask(LOG_TRACE)) {',
         '        struct timeval _now;',
         '        gettimeofday(&_now, NULL);',
+        '#line %(event_lineno)d "%(event_filename)s"',
         '        qemu_log("%%d@%%zu.%%06zu:%(name)s " %(fmt)s "\\n",',
         '                 qemu_get_thread_id(),',
         '                 (size_t)_now.tv_sec, (size_t)_now.tv_usec',
         '                 %(argnames)s);',
+        '#line %(out_next_lineno)d "%(out_filename)s"',
         '    }',
         cond=cond,
+        event_lineno=event.lineno,
+        event_filename=event.filename,
         name=event.name,
         fmt=event.fmt.rstrip("\n"),
         argnames=argnames)
diff --git a/scripts/tracetool/backend/syslog.py b/scripts/tracetool/backend/syslog.py
index 1373a90192..5a3a00fe31 100644
--- a/scripts/tracetool/backend/syslog.py
+++ b/scripts/tracetool/backend/syslog.py
@@ -35,9 +35,13 @@ def generate_h(event, group):
         cond = "trace_event_get_state(%s)" % ("TRACE_" + event.name.upper())
 
     out('    if (%(cond)s) {',
+        '#line %(event_lineno)d "%(event_filename)s"',
         '        syslog(LOG_INFO, "%(name)s " %(fmt)s %(argnames)s);',
+        '#line %(out_next_lineno)d "%(out_filename)s"',
         '    }',
         cond=cond,
+        event_lineno=event.lineno,
+        event_filename=event.filename,
         name=event.name,
         fmt=event.fmt.rstrip("\n"),
         argnames=argnames)
-- 
2.29.2

Re: [PULL 0/5] Tracing patches

[no-reply]

Patchew URL: https://patchew.org/QEMU/20210104143154.462212-1-stefanha@redhat.com/



Hi,

This series seems to have some coding style problems. See output below for
more information:

Type: series
Message-id: 20210104143154.462212-1-stefanha@redhat.com
Subject: [PULL 0/5] Tracing patches

=== TEST SCRIPT BEGIN ===
#!/bin/bash
git rev-parse base > /dev/null || exit 0
git config --local diff.renamelimit 0
git config --local diff.renames True
git config --local diff.algorithm histogram
./scripts/checkpatch.pl --mailback base..
=== TEST SCRIPT END ===

Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
From https://github.com/patchew-project/qemu
 * [new tag]         patchew/20210104143154.462212-1-stefanha@redhat.com -> patchew/20210104143154.462212-1-stefanha@redhat.com
Switched to a new branch 'test'
6b1738f tracetool: show trace-events filename/lineno in fmt string errors
d66a9fc tracetool: add input filename and line number to Event
0262a28 tracetool: add out_lineno and out_next_lineno to out()
95bd058 tracetool: add output filename command-line argument
f8cfb47 trace: Send "-d trace:help" output to stdout

=== OUTPUT BEGIN ===
1/5 Checking commit f8cfb47e3ae2 (trace: Send "-d trace:help" output to stdout)
2/5 Checking commit 95bd058cef88 (tracetool: add output filename command-line argument)
ERROR: line over 90 characters
#73: FILE: scripts/tracetool.py:35:
+Usage: %(script)s --format=<format> --backends=<backends> [<options>] <trace-events> ... <output>

total: 1 errors, 0 warnings, 144 lines checked

Patch 2/5 has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

3/5 Checking commit 0262a28e87d0 (tracetool: add out_lineno and out_next_lineno to out())
4/5 Checking commit d66a9fc4e62f (tracetool: add input filename and line number to Event)
5/5 Checking commit 6b1738f508ad (tracetool: show trace-events filename/lineno in fmt string errors)
=== OUTPUT END ===

Test command exited with code: 1


The full log is available at
http://patchew.org/logs/20210104143154.462212-1-stefanha@redhat.com/testing.checkpatch/?type=message.
---
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Please send your feedback to patchew-devel@redhat.com

Re: [PULL 1/5] trace: Send "-d trace:help" output to stdout

[Philippe Mathieu-Daudé]

On 1/4/21 3:31 PM, Stefan Hajnoczi wrote:
> From: Doug Evans <dje@google.com>
> 
> ... for consistency with "-d help".

Doh the request to make sense with this comment
got lost :/
https://www.mail-archive.com/qemu-devel@nongnu.org/msg765789.html

Not a big deal as the patch is trivial.

> 
> Signed-off-by: Doug Evans <dje@google.com>
> Message-id: 20201125215245.3514695-1-dje@google.com
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>  trace/control.h |  3 ++-
>  trace/control.c | 12 ++++++------
>  2 files changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/trace/control.h b/trace/control.h
> index 05b95ea453..9522a7b318 100644
> --- a/trace/control.h
> +++ b/trace/control.h
> @@ -201,10 +201,11 @@ void trace_fini_vcpu(CPUState *vcpu);
>  
>  /**
>   * trace_list_events:
> + * @f: Where to send output.
>   *
>   * List all available events.
>   */
> -void trace_list_events(void);
> +void trace_list_events(FILE *f);
>  
>  /**
>   * trace_enable_events:
> diff --git a/trace/control.c b/trace/control.c
> index b82fb87316..cd04dd4e0c 100644
> --- a/trace/control.c
> +++ b/trace/control.c
> @@ -125,18 +125,18 @@ TraceEvent *trace_event_iter_next(TraceEventIter *iter)
>      return NULL;
>  }
>  
> -void trace_list_events(void)
> +void trace_list_events(FILE *f)
>  {
>      TraceEventIter iter;
>      TraceEvent *ev;
>      trace_event_iter_init(&iter, NULL);
>      while ((ev = trace_event_iter_next(&iter)) != NULL) {
> -        fprintf(stderr, "%s\n", trace_event_get_name(ev));
> +        fprintf(f, "%s\n", trace_event_get_name(ev));
>      }
>  #ifdef CONFIG_TRACE_DTRACE
> -    fprintf(stderr, "This list of names of trace points may be incomplete "
> -                    "when using the DTrace/SystemTap backends.\n"
> -                    "Run 'qemu-trace-stap list %s' to print the full list.\n",
> +    fprintf(f, "This list of names of trace points may be incomplete "
> +               "when using the DTrace/SystemTap backends.\n"
> +               "Run 'qemu-trace-stap list %s' to print the full list.\n",
>              error_get_progname());
>  #endif
>  }
> @@ -176,7 +176,7 @@ static void do_trace_enable_events(const char *line_buf)
>  void trace_enable_events(const char *line_buf)
>  {
>      if (is_help_option(line_buf)) {
> -        trace_list_events();
> +        trace_list_events(stdout);
>          if (monitor_cur() == NULL) {
>              exit(0);
>          }
> 

Re: [PULL 0/5] Tracing patches

[Peter Maydell]

On Mon, 4 Jan 2021 at 14:32, Stefan Hajnoczi <stefanha@redhat.com> wrote:
>
> The following changes since commit 41192db338588051f21501abc13743e62b0a5605:
>
>   Merge remote-tracking branch 'remotes/ehabkost-gl/tags/machine-next-pull-request' into staging (2021-01-01 22:57:15 +0000)
>
> are available in the Git repository at:
>
>   https://gitlab.com/stefanha/qemu.git tags/tracing-pull-request
>
> for you to fetch changes up to 7fb48c0ee1bbf5cc4c905e900b054096250e9f39:
>
>   tracetool: show trace-events filename/lineno in fmt string errors (2021-01-04 14:24:58 +0000)
>
> ----------------------------------------------------------------
> Pull request
>
> Show trace-events filename/lineno in fmt string errors and send -d trace:help
> output to stdout for consistency.
>
> ----------------------------------------------------------------
>
> Doug Evans (1):
>   trace: Send "-d trace:help" output to stdout
>
> Stefan Hajnoczi (4):
>   tracetool: add output filename command-line argument
>   tracetool: add out_lineno and out_next_lineno to out()
>   tracetool: add input filename and line number to Event
>   tracetool: show trace-events filename/lineno in fmt string errors


Applied, thanks.

Please update the changelog at https://wiki.qemu.org/ChangeLog/6.0
for any user-visible changes.

-- PMM