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trace: add --group=all to tracing.txt 

tracetool needs to know the group name ("all", "root", or a specific
subdirectory).  Also remove the stdin redirection because tracetool.py
needs the path to the trace-events file.  Update the documentation.

Fixes: 2098c56a9b
       ("trace: move setting of group name into Makefiles")
Buglink: https://bugs.launchpad.net/bugs/1844814
Reported-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20191009135154.10970-1-stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2019-10-09 14:51:54 +01:00
parent 98b2e3c9ab
commit bd200384c5
1 changed files with 2 additions and 1 deletions
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3
docs/devel/tracing.txt
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@ -317,7 +317,8 @@ probes:
--binary path/to/qemu-binary \
--target-type system \
--target-name x86_64 \
<trace-events-all >qemu.stp
--group=all \
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.