perf script: Add more documentation about the -f/--fields parameters

Using the commit log for 2c9e45f.

Cc: David Ahern <daahern@cisco.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index 66f040b30729d3a3ec0cadab896c1df63160efa1..86c87e214b11d295ed07ce6fa5005f906484d8f7 100644 (file)
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -113,13 +113,61 @@ OPTIONS
         Do various checks like samples ordering and lost events.
 
 -f::
---fields
+--fields::
         Comma separated list of fields to print. Options are:
         comm, tid, pid, time, cpu, event, trace, sym. Field
-        list must be prepended with the type, trace, sw or hw,
+        list can be prepended with the type, trace, sw or hw,
         to indicate to which event type the field list applies.
         e.g., -f sw:comm,tid,time,sym  and -f trace:time,cpu,trace
 
+               perf script -f <fields>
+
+       is equivalent to:
+
+               perf script -f trace:<fields> -f sw:<fields> -f hw:<fields>
+    
+       i.e., the specified fields apply to all event types if the type string
+       is not given.
+    
+       The arguments are processed in the order received. A later usage can
+       reset a prior request. e.g.:
+    
+               -f trace: -f comm,tid,time,sym
+    
+       The first -f suppresses trace events (field list is ""), but then the
+       second invocation sets the fields to comm,tid,time,sym. In this case a
+       warning is given to the user:
+    
+               "Overriding previous field request for all events."
+    
+       Alternativey, consider the order:
+    
+               -f comm,tid,time,sym -f trace:
+    
+       The first -f sets the fields for all events and the second -f
+       suppresses trace events. The user is given a warning message about
+       the override, and the result of the above is that only S/W and H/W
+       events are displayed with the given fields.
+    
+       For the 'wildcard' option if a user selected field is invalid for an
+       event type, a message is displayed to the user that the option is
+       ignored for that type. For example:
+    
+               $ perf script -f comm,tid,trace
+               'trace' not valid for hardware events. Ignoring.
+               'trace' not valid for software events. Ignoring.
+    
+       Alternatively, if the type is given an invalid field is specified it
+       is an error. For example:
+    
+        perf script -v -f sw:comm,tid,trace
+        'trace' not valid for software events.
+    
+       At this point usage is displayed, and perf-script exits.
+    
+       Finally, a user may not set fields to none for all event types.
+       i.e., -f "" is not allowed.
+
 -k::
 --vmlinux=<file>::
         vmlinux pathname