Add marker into context_switch to record the prev and next tasks. Signed-off-by: Steven Rostedt --- kernel/sched.c | 2 ++ 1 file changed, 2 insertions(+) Index: linux-mcount.git/kernel/sched.c =================================================================== --- linux-mcount.git.orig/kernel/sched.c 2008-01-30 14:36:00.000000000 -0500 +++ linux-mcount.git/kernel/sched.c 2008-01-30 15:25:31.000000000 -0500 @@ -2198,6 +2198,8 @@ context_switch(struct rq *rq, struct tas struct mm_struct *mm, *oldmm; prepare_task_switch(rq, prev, next); + trace_mark(kernel_sched_schedule, + "prev %p next %p", prev, next); mm = next->mm; oldmm = prev->active_mm; /* --