perf trace: Add interface to access perf data from Perl handlers

The Perl scripting support for perf trace allows most of a trace
event's data to be accessed directly as handler arguments, but
not all of it e.g. the less common fields aren't passed in.  To
give scripts access to the other fields and/or any other data or
metadata in the main perf executable that might be useful, a way
to access the C data in perf from Perl is needed; this patch
uses the Perl XS facility to do it for the common_xxx event
fields not passed to handler functions.

Context.pm exports three functions to Perl scripts that access
fields for the current event by calling back into perf:
common_pc(), common_flags() and common_lock_depth().  Support
for common_flags() field values was added to Core.pm and a
script used to sanity check these and other basic scripting
features, check-perf-trace.pl, was also added.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: anton@samba.org
Cc: hch@infradead.org
LKML-Reference: <1259133352-23685-6-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 3 deletions

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 1f16495e559..0302405aa2c 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -1982,7 +1982,7 @@ int trace_parse_common_pid(void *data)
                               "common_pid");
 }
 
-static int parse_common_pc(void *data)
+int parse_common_pc(void *data)
 {
         static int pc_offset;
         static int pc_size;
@@ -1991,7 +1991,7 @@ static int parse_common_pc(void *data)
                               "common_preempt_count");
 }
 
-static int parse_common_flags(void *data)
+int parse_common_flags(void *data)
 {
         static int flags_offset;
         static int flags_size;
@@ -2000,7 +2000,7 @@ static int parse_common_flags(void *data)
                               "common_flags");
 }
 
-static int parse_common_lock_depth(void *data)
+int parse_common_lock_depth(void *data)
 {
         static int ld_offset;
         static int ld_size;