From: Stefan Hajnoczi <stefanha@redhat.com>
To: qemu-devel@nongnu.org
Cc: "Peter Maydell" <peter.maydell@linaro.org>,
"Eduardo Habkost" <ehabkost@redhat.com>,
qemu-block@nongnu.org, "Markus Armbruster" <armbru@redhat.com>,
"Stefan Hajnoczi" <stefanha@redhat.com>,
"Cleber Rosa" <crosa@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>
Subject: [PULL 10/11] trace: document how to specify multiple --trace patterns
Date: Mon, 1 Feb 2021 15:47:02 +0000 [thread overview]
Message-ID: <20210201154703.180022-11-stefanha@redhat.com> (raw)
In-Reply-To: <20210201154703.180022-1-stefanha@redhat.com>
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
next prev parent reply other threads:[~2021-02-01 15:58 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-01 15:46 [PULL 00/11] Tracing patches Stefan Hajnoczi
2021-02-01 15:46 ` [PULL 01/11] trace: fix simpletrace doc mismerge Stefan Hajnoczi
2021-02-01 15:46 ` [PULL 02/11] tracing: convert documentation to rST Stefan Hajnoczi
2021-02-01 15:46 ` [PULL 03/11] trace: recommend "log" backend for getting started with tracing Stefan Hajnoczi
2021-02-01 15:46 ` [PULL 04/11] tracetool: fix "PRI" macro decoding Stefan Hajnoczi
2021-02-01 15:46 ` [PULL 05/11] tracetool: also strip %l and %ll from systemtap format strings Stefan Hajnoczi
2021-02-01 15:46 ` [PULL 06/11] trace: add meson custom_target() depend_files for tracetool Stefan Hajnoczi
2021-02-01 15:46 ` [PULL 07/11] error: rename error_with_timestamp to message_with_timestamp Stefan Hajnoczi
2021-02-01 15:47 ` [PULL 08/11] trace: make the 'log' backend timestamp configurable Stefan Hajnoczi
2021-02-01 15:47 ` [PULL 09/11] simpletrace: build() missing 2 required positional arguments Stefan Hajnoczi
2021-02-01 15:47 ` Stefan Hajnoczi [this message]
2021-02-01 16:05 ` [PULL 10/11] trace: document how to specify multiple --trace patterns BALATON Zoltan
2021-02-01 16:13 ` Kevin Wolf
2021-02-01 16:27 ` Philippe Mathieu-Daudé
2021-02-01 16:29 ` BALATON Zoltan
2021-02-01 16:54 ` Kevin Wolf
2021-02-01 17:25 ` Paolo Bonzini
2021-02-01 17:39 ` BALATON Zoltan
2021-02-02 12:41 ` Markus Armbruster
2021-02-02 13:03 ` BALATON Zoltan
2021-02-02 13:12 ` Paolo Bonzini
2021-02-01 17:46 ` Daniel P. Berrangé
2021-02-01 18:13 ` BALATON Zoltan
2021-02-02 16:47 ` Stefan Hajnoczi
2021-02-01 15:47 ` [PULL 11/11] trace: update docs with meson build information Stefan Hajnoczi
2021-02-02 11:24 ` [PULL 00/11] Tracing patches Peter Maydell
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