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| author | Paul Durrant <paul.durrant@citrix.com> | 2016-08-04 14:44:14 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2016-09-05 13:47:01 -0400 |
| commit | 0a852417564bc59441dc09509beacf7b49bc1e57 (patch) | |
| tree | a27b04adbdaa3681d8797dab9097df2aca9464fd /docs | |
| parent | e87d397e5ef66276ccc49b829527d605ca07d0ad (diff) | |
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 <paul.durrant@citrix.com>
Message-id: 1470318254-29989-1-git-send-email-paul.durrant@citrix.com
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/tracing.txt | 12 |
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> |