From 0a852417564bc59441dc09509beacf7b49bc1e57 Mon Sep 17 00:00:00 2001 From: Paul Durrant Date: Thu, 4 Aug 2016 14:44:14 +0100 Subject: trace: add syslog tracing backend This patch adds a tracing backend which sends output using syslog(). The syslog backend is limited to POSIX compliant systems. openlog() is called with facility set to LOG_DAEMON, with the LOG_PID option. Trace events are logged at level LOG_INFO. Signed-off-by: Paul Durrant Message-id: 1470318254-29989-1-git-send-email-paul.durrant@citrix.com Cc: Stefan Hajnoczi Signed-off-by: Stefan Hajnoczi --- docs/tracing.txt | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'docs') 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 -- cgit v1.2.3-55-g7522