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[PULL 10/11] trace: document how to specify multiple --trace patterns
From: |
Stefan Hajnoczi |
Subject: |
[PULL 10/11] trace: document how to specify multiple --trace patterns |
Date: |
Mon, 1 Feb 2021 15:47:02 +0000 |
It is possible to repeat the --trace option to specify multiple
patterns. This may be preferrable to users who do not want to create a
file with a list of patterns.
Suggested-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20210112165859.225534-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
docs/devel/tracing.rst | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/docs/devel/tracing.rst b/docs/devel/tracing.rst
index af395e957d..e8f9b82c5e 100644
--- a/docs/devel/tracing.rst
+++ b/docs/devel/tracing.rst
@@ -22,10 +22,15 @@ events::
This output comes from the "log" trace backend that is enabled by default when
``./configure --enable-trace-backends=BACKENDS`` was not explicitly specified.
-More than one trace event pattern can be specified by providing a file
-instead::
+Multiple patterns can be specified by repeating the ``--trace`` option::
+
+ $ qemu --trace "kvm_*" --trace "virtio_*" ...
+
+When patterns are used frequently it is more convenient to store them in a
+file to avoid long command-line options::
$ echo "memory_region_ops_*" >/tmp/events
+ $ echo "kvm_*" >>/tmp/events
$ qemu --trace events=/tmp/events ...
Trace events
--
2.29.2
- [PULL 00/11] Tracing patches, Stefan Hajnoczi, 2021/02/01
- [PULL 01/11] trace: fix simpletrace doc mismerge, Stefan Hajnoczi, 2021/02/01
- [PULL 04/11] tracetool: fix "PRI" macro decoding, Stefan Hajnoczi, 2021/02/01
- [PULL 06/11] trace: add meson custom_target() depend_files for tracetool, Stefan Hajnoczi, 2021/02/01
- [PULL 07/11] error: rename error_with_timestamp to message_with_timestamp, Stefan Hajnoczi, 2021/02/01
- [PULL 08/11] trace: make the 'log' backend timestamp configurable, Stefan Hajnoczi, 2021/02/01
- [PULL 03/11] trace: recommend "log" backend for getting started with tracing, Stefan Hajnoczi, 2021/02/01
- [PULL 02/11] tracing: convert documentation to rST, Stefan Hajnoczi, 2021/02/01
- [PULL 11/11] trace: update docs with meson build information, Stefan Hajnoczi, 2021/02/01
- [PULL 10/11] trace: document how to specify multiple --trace patterns,
Stefan Hajnoczi <=
- Re: [PULL 10/11] trace: document how to specify multiple --trace patterns, BALATON Zoltan, 2021/02/01
- Re: [PULL 10/11] trace: document how to specify multiple --trace patterns, Kevin Wolf, 2021/02/01
- Re: [PULL 10/11] trace: document how to specify multiple --trace patterns, Philippe Mathieu-Daudé, 2021/02/01
- Re: [PULL 10/11] trace: document how to specify multiple --trace patterns, BALATON Zoltan, 2021/02/01
- Re: [PULL 10/11] trace: document how to specify multiple --trace patterns, Kevin Wolf, 2021/02/01
- Re: [PULL 10/11] trace: document how to specify multiple --trace patterns, Paolo Bonzini, 2021/02/01
- Re: [PULL 10/11] trace: document how to specify multiple --trace patterns, BALATON Zoltan, 2021/02/01
- Re: [PULL 10/11] trace: document how to specify multiple --trace patterns, Markus Armbruster, 2021/02/02
- Re: [PULL 10/11] trace: document how to specify multiple --trace patterns, BALATON Zoltan, 2021/02/02
- Re: [PULL 10/11] trace: document how to specify multiple --trace patterns, Paolo Bonzini, 2021/02/02