lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

function-graph: add option to calculate graph time or not

Browse Source 
graph time is the time that a function is executing another function.
Thus if function A calls B, if graph-time is set, then the time for
A includes B. This is the default behavior. But if graph-time is off,
then the time spent executing B is subtracted from A.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt
2009-03-24 23:17:58 -04:00
parent cafb168a1c
commit a2a16d6a31
5 changed files with 29 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
kernel/trace/ftrace.c
View File

@@ -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);
}