]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
tracing: add format file to describe event struct fields
authorSteven Rostedt <srostedt@redhat.com>
Mon, 2 Mar 2009 18:53:59 +0000 (13:53 -0500)
committerSteven Rostedt <srostedt@redhat.com>
Mon, 2 Mar 2009 19:27:27 +0000 (14:27 -0500)
commit981d081ec8b958b7d962ee40d433581a55d40fc5
tree366aa5da7dc98cc2354002946e6f19ec60c02301
parentf9520750c4c9924c14325cd951efae5fae58104c
tracing: add format file to describe event struct fields

This patch adds the "format" file to the trace point event directory.
This is based off of work by Tom Zanussi, in which a file is exported
to be tread from user land such that a user space app may read the
binary record stored in the ring buffer.

 # cat /debug/tracing/events/sched/sched_switch/format
        field:pid_t prev_pid;   offset:12;      size:4;
        field:int prev_prio;    offset:16;      size:4;
        field special:char next_comm[TASK_COMM_LEN];    offset:20;      size:16;
        field:pid_t next_pid;   offset:36;      size:4;
        field:int next_prio;    offset:40;      size:4;

Idea-from: Tom Zanussi <tzanussi@gmail.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
kernel/trace/trace.h
kernel/trace/trace_events.c
kernel/trace/trace_events_stage_2.h
kernel/trace/trace_events_stage_3.h