* [Qemu-devel] [PATCH v2] New trace-event backend: stderr
@ 2011-01-26 11:34 Fabien Chouteau
2011-01-26 12:34 ` Stefan Hajnoczi
2011-01-26 12:56 ` Peter Maydell
0 siblings, 2 replies; 5+ messages in thread
From: Fabien Chouteau @ 2011-01-26 11:34 UTC (permalink / raw)
To: qemu-devel; +Cc: Fabien Chouteau
This backend sends trace events to standard error output during the emulation.
Signed-off-by: Fabien Chouteau <chouteau@adacore.com>
---
configure | 2 +-
docs/tracing.txt | 5 +++++
scripts/tracetool | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 58 insertions(+), 2 deletions(-)
diff --git a/configure b/configure
index 210670c..560274e 100755
--- a/configure
+++ b/configure
@@ -907,7 +907,7 @@ echo " --enable-docs enable documentation build"
echo " --disable-docs disable documentation build"
echo " --disable-vhost-net disable vhost-net acceleration support"
echo " --enable-vhost-net enable vhost-net acceleration support"
-echo " --enable-trace-backend=B Trace backend nop simple ust dtrace"
+echo " --enable-trace-backend=B Trace backend nop simple stderr ust dtrace"
echo " --with-trace-file=NAME Full PATH,NAME of file to store traces"
echo " Default:trace-<pid>"
echo " --disable-spice disable spice"
diff --git a/docs/tracing.txt b/docs/tracing.txt
index 963c504..21183f9 100644
--- a/docs/tracing.txt
+++ b/docs/tracing.txt
@@ -133,6 +133,11 @@ source tree. It may not be as powerful as platform-specific or third-party
trace backends but it is portable. This is the recommended trace backend
unless you have specific needs for more advanced backends.
+=== Stderr ===
+
+The "stderr" backend sends trace events directly to standard error output
+during emulation.
+
==== Monitor commands ====
* info trace
diff --git a/scripts/tracetool b/scripts/tracetool
index fce491c..a686fe2 100755
--- a/scripts/tracetool
+++ b/scripts/tracetool
@@ -19,6 +19,7 @@ Generate tracing code for a file on stdin.
Backends:
--nop Tracing disabled
--simple Simple built-in backend
+ --stderr Stderr built-in backend
--ust LTTng User Space Tracing backend
--dtrace DTrace/SystemTAP backend
@@ -236,6 +237,56 @@ linetoc_end_simple()
EOF
}
+#STDERR
+linetoh_begin_stderr()
+{
+ cat <<EOF
+#include <stdio.h>
+EOF
+}
+
+linetoh_stderr()
+{
+ local name args argnamess argc fmt
+ name=$(get_name "$1")
+ args=$(get_args "$1")
+ argnames=$(get_argnames "$1" ",")
+ argc=$(get_argc "$1")
+ fmt=$(get_fmt "$1")
+
+ if [ "$argc" -gt 0 ]; then
+ argnames=", $argnames"
+ fi
+
+ cat <<EOF
+static inline void trace_$name($args)
+{
+ fprintf(stderr, "$name $fmt\n" $argnames);
+}
+EOF
+}
+
+linetoh_end_stderr()
+{
+return
+}
+
+linetoc_begin_stderr()
+{
+return
+}
+
+linetoc_stderr()
+{
+return
+}
+
+linetoc_end_stderr()
+{
+return
+}
+#END OF STDERR
+
# Clean up after UST headers which pollute the namespace
ust_clean_namespace() {
cat <<EOF
@@ -546,7 +597,7 @@ targetarch=
until [ -z "$1" ]
do
case "$1" in
- "--nop" | "--simple" | "--ust" | "--dtrace") backend="${1#--}" ;;
+ "--nop" | "--simple" | "--stderr" | "--ust" | "--dtrace") backend="${1#--}" ;;
"--binary") shift ; binary="$1" ;;
"--target-arch") shift ; targetarch="$1" ;;
--
1.7.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] [PATCH v2] New trace-event backend: stderr
2011-01-26 11:34 [Qemu-devel] [PATCH v2] New trace-event backend: stderr Fabien Chouteau
@ 2011-01-26 12:34 ` Stefan Hajnoczi
2011-01-26 13:05 ` Fabien Chouteau
2011-01-26 12:56 ` Peter Maydell
1 sibling, 1 reply; 5+ messages in thread
From: Stefan Hajnoczi @ 2011-01-26 12:34 UTC (permalink / raw)
To: Fabien Chouteau; +Cc: qemu-devel
On Wed, Jan 26, 2011 at 11:34 AM, Fabien Chouteau <chouteau@adacore.com> wrote:
> +linetoh_stderr()
> +{
> + local name args argnamess argc fmt
s/argnamess/argnames/
Stefan
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] [PATCH v2] New trace-event backend: stderr
2011-01-26 11:34 [Qemu-devel] [PATCH v2] New trace-event backend: stderr Fabien Chouteau
2011-01-26 12:34 ` Stefan Hajnoczi
@ 2011-01-26 12:56 ` Peter Maydell
2011-01-26 13:23 ` Fabien Chouteau
1 sibling, 1 reply; 5+ messages in thread
From: Peter Maydell @ 2011-01-26 12:56 UTC (permalink / raw)
To: Fabien Chouteau; +Cc: qemu-devel
On 26 January 2011 11:34, Fabien Chouteau <chouteau@adacore.com> wrote:
> -echo " --enable-trace-backend=B Trace backend nop simple ust dtrace"
> +echo " --enable-trace-backend=B Trace backend nop simple stderr ust dtrace"
This is a bit cryptic, especially since there's no punctuation.
Maybe it would be better to have something like the audio
driver options:
echo " --enable-trace-backend=B Set trace backend:"
echo " Available backends: $trace_possible_backends"
(and set trace_possible_backends earlier, perhaps even
automatically by running tracetool?)
-- PMM
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] [PATCH v2] New trace-event backend: stderr
2011-01-26 12:34 ` Stefan Hajnoczi
@ 2011-01-26 13:05 ` Fabien Chouteau
0 siblings, 0 replies; 5+ messages in thread
From: Fabien Chouteau @ 2011-01-26 13:05 UTC (permalink / raw)
To: Stefan Hajnoczi; +Cc: qemu-devel
On 01/26/2011 01:34 PM, Stefan Hajnoczi wrote:
> On Wed, Jan 26, 2011 at 11:34 AM, Fabien Chouteau<chouteau@adacore.com> wrote:
>> +linetoh_stderr()
>> +{
>> + local name args argnamess argc fmt
>
> s/argnamess/argnames/
Fixed.
Thanks,
--
Fabien Chouteau
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [Qemu-devel] [PATCH v2] New trace-event backend: stderr
2011-01-26 12:56 ` Peter Maydell
@ 2011-01-26 13:23 ` Fabien Chouteau
0 siblings, 0 replies; 5+ messages in thread
From: Fabien Chouteau @ 2011-01-26 13:23 UTC (permalink / raw)
To: Peter Maydell; +Cc: qemu-devel
On 01/26/2011 01:56 PM, Peter Maydell wrote:
> On 26 January 2011 11:34, Fabien Chouteau<chouteau@adacore.com> wrote:
>> -echo " --enable-trace-backend=B Trace backend nop simple ust dtrace"
>> +echo " --enable-trace-backend=B Trace backend nop simple stderr ust dtrace"
>
> This is a bit cryptic, especially since there's no punctuation.
> Maybe it would be better to have something like the audio
> driver options:
> echo " --enable-trace-backend=B Set trace backend:"
> echo " Available backends: $trace_possible_backends"
>
> (and set trace_possible_backends earlier, perhaps even
> automatically by running tracetool?)
>
> -- PMM
I will add this in the next version of the patch.
--
Fabien Chouteau
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2011-01-26 13:24 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2011-01-26 11:34 [Qemu-devel] [PATCH v2] New trace-event backend: stderr Fabien Chouteau
2011-01-26 12:34 ` Stefan Hajnoczi
2011-01-26 13:05 ` Fabien Chouteau
2011-01-26 12:56 ` Peter Maydell
2011-01-26 13:23 ` Fabien Chouteau
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