tree ff2ddf891b6e37a375990506070628b8aeb1ce4b
parent 2321442920ab67a1c196d4a53dd564726370946d
author Chen Fan <chen.fan.fnst@cn.fujitsu.com> 1405049077 +0800
committer Stefan Hajnoczi <stefanha@redhat.com> 1411720478 +0100

trace: docs: add trace file description

When user used the trace print command from docs/tracing.txt:
  ./scripts/simpletrace.py trace-events trace-*

the user maybe be misled by the "trace-*", because if user
directly copy the comand line to run, there alway print the
bored message:
"usage: ./scripts/simpletrace.py <trace-events> <trace-file>"

then we should describe that the "trace-*" represented.

Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>