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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2019-03-21 17:08:31 +0000 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2019-03-22 15:55:50 +0000 |
| commit | b33b890cd07eca1d05cd8c4f5f03790f0585423f (patch) | |
| tree | 6e1252313b3fb72b0d4f94d341fed6351fe747dd /scripts/tracetool | |
| parent | fd9858317a3d06c94ad8c1c420e6b5c376f5a92e (diff) | |
| download | qemu-b33b890cd07eca1d05cd8c4f5f03790f0585423f.zip qemu-b33b890cd07eca1d05cd8c4f5f03790f0585423f.tar.gz qemu-b33b890cd07eca1d05cd8c4f5f03790f0585423f.tar.bz2 | |
trace: avoid SystemTap dtrace(1) warnings on empty files
target/hppa/trace-events only contains disabled events, resulting in a
trace-dtrace.dtrace file that says "provider qemu {}". SystemTap's
dtrace(1) tool prints a warning when processing this input file.
This patch avoids the error by emitting an empty file instead of
"provider qemu {}" when there are no enabled trace events.
Fixes: 23c3d569f44284066714ff7c46bc4f19e630583f ("target/hppa: add TLB trace events")
Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Message-id: 20190321170831.6539-3-stefanha@redhat.com
Message-Id: <20190321170831.6539-3-stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'scripts/tracetool')
| -rw-r--r-- | scripts/tracetool/format/d.py | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/scripts/tracetool/format/d.py b/scripts/tracetool/format/d.py index 78397c2..c7cb2a9 100644 --- a/scripts/tracetool/format/d.py +++ b/scripts/tracetool/format/d.py @@ -33,6 +33,11 @@ def generate(events, backend, group): events = [e for e in events if "disable" not in e.properties] + # SystemTap's dtrace(1) warns about empty "provider qemu {}" but is happy + # with an empty file. Avoid the warning. + if not events: + return + out('/* This file is autogenerated by tracetool, do not edit. */' '', 'provider qemu {') |