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Subject[PATCHv2 4/5] tracing, function_graph: Remove lock-depth from latency trace
Date
The lock_depth was removed in commit
e6e1e25 tracing: Remove lock_depth from event entry

Removing the lock_depth info from function_graph latency header.


With following commands:
# echo function_graph > ./current_tracer
# echo 1 > options/latency-format
# cat trace
This is what it looked like before:
# tracer: function_graph
#
# function_graph latency trace v1.1.5 on 3.0.0-rc1-tip+
# --------------------------------------------------------------------
# latency: 0 us, #59756/311298, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
# -----------------
# | task: -0 (uid:0 nice:0 policy:0 rt_prio:0)
# -----------------
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / _-=> lock-depth
# |||| /
# CPU||||| DURATION FUNCTION CALLS
# | ||||| | | | | | |
0) .... 0.068 us | } /* __rcu_read_unlock */
...
This is what it looks like now:
# tracer: function_graph
#
# function_graph latency trace v1.1.5 on 3.0.0-rc1-tip+
# --------------------------------------------------------------------
# latency: 0 us, #59747/1744610, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
# -----------------
# | task: -0 (uid:0 nice:0 policy:0 rt_prio:0)
# -----------------
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| /
# CPU|||| DURATION FUNCTION CALLS
# | |||| | | | | | |
0) ..s. 1.641 us | } /* __rcu_process_callbacks */
...

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
---
kernel/trace/trace_functions_graph.c | 7 +++----
1 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 44b955f..1da5b97 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -1298,8 +1298,7 @@ static void print_lat_header(struct seq_file *s, u32 flags)
seq_printf(s, "#%.*s / _----=> need-resched \n", size, spaces);
seq_printf(s, "#%.*s| / _---=> hardirq/softirq \n", size, spaces);
seq_printf(s, "#%.*s|| / _--=> preempt-depth \n", size, spaces);
- seq_printf(s, "#%.*s||| / _-=> lock-depth \n", size, spaces);
- seq_printf(s, "#%.*s|||| / \n", size, spaces);
+ seq_printf(s, "#%.*s||| / \n", size, spaces);
}

static void __print_graph_headers_flags(struct seq_file *s, u32 flags)
@@ -1318,7 +1317,7 @@ static void __print_graph_headers_flags(struct seq_file *s, u32 flags)
if (flags & TRACE_GRAPH_PRINT_PROC)
seq_printf(s, " TASK/PID ");
if (lat)
- seq_printf(s, "|||||");
+ seq_printf(s, "||||");
if (flags & TRACE_GRAPH_PRINT_DURATION)
seq_printf(s, " DURATION ");
seq_printf(s, " FUNCTION CALLS\n");
@@ -1332,7 +1331,7 @@ static void __print_graph_headers_flags(struct seq_file *s, u32 flags)
if (flags & TRACE_GRAPH_PRINT_PROC)
seq_printf(s, " | | ");
if (lat)
- seq_printf(s, "|||||");
+ seq_printf(s, "||||");
if (flags & TRACE_GRAPH_PRINT_DURATION)
seq_printf(s, " | | ");
seq_printf(s, " | | | |\n");
--
1.7.1


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