From: Mads Ynddal <mads@ynddal.dk>
To: qemu-devel@nongnu.org
Cc: Stefan Hajnoczi <stefanha@redhat.com>,
John Snow <jsnow@redhat.com>, Mads Ynddal <mads@ynddal.dk>,
Cleber Rosa <crosa@redhat.com>,
Mads Ynddal <m.ynddal@samsung.com>
Subject: [PATCH v5 02/14] simpletrace: annotate magic constants from QEMU code
Date: Tue, 26 Sep 2023 12:34:24 +0200 [thread overview]
Message-ID: <20230926103436.25700-3-mads@ynddal.dk> (raw)
In-Reply-To: <20230926103436.25700-1-mads@ynddal.dk>
From: Mads Ynddal <m.ynddal@samsung.com>
It wasn't clear where the constants and structs came from, so I added
comments to help.
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Mads Ynddal <m.ynddal@samsung.com>
---
scripts/simpletrace.py | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/scripts/simpletrace.py b/scripts/simpletrace.py
index b221d9a241..5c230a1b74 100755
--- a/scripts/simpletrace.py
+++ b/scripts/simpletrace.py
@@ -16,6 +16,11 @@
__all__ = ['Analyzer', 'process', 'run']
+# This is the binary format that the QEMU "simple" trace backend
+# emits. There is no specification documentation because the format is
+# not guaranteed to be stable. Trace files must be parsed with the
+# same trace-events-all file and the same simpletrace.py file that
+# QEMU was built with.
header_event_id = 0xffffffffffffffff
header_magic = 0xf2b177cb0aa429b4
dropped_event_id = 0xfffffffffffffffe
--
2.38.1
next prev parent reply other threads:[~2023-09-26 10:35 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-26 10:34 [PATCH v5 00/14] simpletrace: refactor and general improvements Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 01/14] simpletrace: add __all__ to define public interface Mads Ynddal
2023-09-26 10:34 ` Mads Ynddal [this message]
2023-09-26 10:34 ` [PATCH v5 03/14] simpletrace: improve parsing of sys.argv; fix files never closed Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 04/14] simpletrace: changed naming of edict and idtoname to improve readability Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 05/14] simpletrace: update code for Python 3.11 Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 06/14] simpletrace: improved error handling on struct unpack Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 07/14] simpletrace: define exception and add handling Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 08/14] simpletrace: made Analyzer into context-manager Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 09/14] simpletrace: refactor to separate responsibilities Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 10/14] simpletrace: move logic of process into internal function Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 11/14] simpletrace: move event processing to Analyzer class Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 12/14] simpletrace: added simplified Analyzer2 class Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 13/14] MAINTAINERS: add maintainer of simpletrace.py Mads Ynddal
2023-09-26 10:34 ` [PATCH v5 14/14] scripts/analyse-locks-simpletrace.py: changed iteritems() to items() Mads Ynddal
2023-09-26 16:32 ` [PATCH v5 00/14] simpletrace: refactor and general improvements Stefan Hajnoczi
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