diff options
Diffstat (limited to 'kernel/trace/ftrace.c')
| -rw-r--r-- | kernel/trace/ftrace.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index ed1fc5021d44..71e5faef12ab 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -604,6 +604,7 @@ static int profile_graph_entry(struct ftrace_graph_ent *trace) static void profile_graph_return(struct ftrace_graph_ret *trace) { struct ftrace_profile_stat *stat; + unsigned long long calltime; struct ftrace_profile *rec; unsigned long flags; @@ -612,9 +613,27 @@ static void profile_graph_return(struct ftrace_graph_ret *trace) if (!stat->hash) goto out; + calltime = trace->rettime - trace->calltime; + + if (!(trace_flags & TRACE_ITER_GRAPH_TIME)) { + int index; + + index = trace->depth; + + /* Append this call time to the parent time to subtract */ + if (index) + current->ret_stack[index - 1].subtime += calltime; + + if (current->ret_stack[index].subtime < calltime) + calltime -= current->ret_stack[index].subtime; + else + calltime = 0; + } + rec = ftrace_find_profiled_func(stat, trace->func); if (rec) - rec->time += trace->rettime - trace->calltime; + rec->time += calltime; + out: local_irq_restore(flags); } |
