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-rw-r--r--docs/tracing.txt12
1 files changed, 12 insertions, 0 deletions
diff --git a/docs/tracing.txt b/docs/tracing.txt
index 29f2f9a24d..e62444ca68 100644
--- a/docs/tracing.txt
+++ b/docs/tracing.txt
@@ -192,6 +192,18 @@ After running qemu by root user, you can get the trace:
Restriction: "ftrace" backend is restricted to Linux only.
+=== Syslog ===
+
+The "syslog" backend sends trace events using the POSIX syslog API. The log
+is opened specifying the LOG_DAEMON facility and LOG_PID option (so events
+are tagged with the pid of the particular QEMU process that generated
+them). All events are logged at LOG_INFO level.
+
+NOTE: syslog may squash duplicate consecutive trace events and apply rate
+ limiting.
+
+Restriction: "syslog" backend is restricted to POSIX compliant OS.
+
==== Monitor commands ====
* trace-file on|off|flush|set <path>