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[v5,02/14] simpletrace: annotate magic constants from QEMU code

Message ID 20230926103436.25700-3-mads@ynddal.dk (mailing list archive)
State New, archived
Headers show
Series simpletrace: refactor and general improvements | expand

Commit Message

Mads Ynddal Sept. 26, 2023, 10:34 a.m. UTC 
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(+)
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Patch

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