From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>
I'm constantly needing to look at the event formats of ftrace events
(like the function event or print event), but trace-cmd list does not
include them, as they can not be enabled by trace-cmd record/start.
By default, trace-cmd list -e, wont show ftrace events, but if a regex
is added to the search: trace-cmd list -e print, then it will now list
those events in ftrace. This is useful for:
# trace-cmd list -e ftrace:function -F
system: ftrace
name: function
ID: 1
format:
field:unsigned short common_type; offset:0; size:2; signed:0;
field:unsigned char common_flags; offset:2; size:1; signed:0;
field:unsigned char common_preempt_count; offset:3; size:1; signed:0;
field:int common_pid; offset:4; size:4; signed:1;
field:unsigned long ip; offset:8; size:8; signed:0;
field:unsigned long parent_ip; offset:16; size:8; signed:0;
Changes since v2:
- Fixed cover letter subject and body, as v2 referenced listing of options?
https://lore.kernel.org/linux-trace-devel/20210422211803.862397-1-rostedt@xxxxxxxxxxx/
- Broke up patch: https://lore.kernel.org/linux-trace-devel/20210422211803.862397-4-rostedt@xxxxxxxxxxx/
To separate out the adding of the helper function "match_system_events()"
from the functional change of listing ftrace events.
- The diff of this patch set compared to v2 is the same (no functional changes).
Steven Rostedt (VMware) (4):
trace-cmd list: Add --full to show print fmt of an event
trace-cmd list: Use tracefs to help find events for -e
trace-cmd list: Add match_system_events() helper function
trace-cmd list: Add ftrace events to listing of events
Documentation/trace-cmd/trace-cmd-list.1.txt | 5 +-
tracecmd/trace-list.c | 179 +++++++++++++++++--
tracecmd/trace-usage.c | 1 +
3 files changed, 168 insertions(+), 17 deletions(-)
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2.29.2
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