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| author | Namhyung Kim <namhyung@kernel.org> | 2016-09-01 11:43:54 +0900 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2016-09-01 11:19:55 -0400 |
| commit | 613dccdf681aed9f9d1243bb2b8cd864a887802f (patch) | |
| tree | cd6c5221142348f04d31724fc1df220be6b674cf /kernel/trace | |
| parent | 5ba8a4a96f6eaa6af88e24c7794f142217aa3b6f (diff) | |
| download | linux-stable-613dccdf681aed9f9d1243bb2b8cd864a887802f.tar.gz linux-stable-613dccdf681aed9f9d1243bb2b8cd864a887802f.tar.bz2 linux-stable-613dccdf681aed9f9d1243bb2b8cd864a887802f.zip | |
function_graph: Handle TRACE_BPUTS in print_graph_comment
It missed to handle TRACE_BPUTS so messages recorded by trace_bputs()
will be shown with symbol info unnecessarily.
You can see it with the trace_printk sample code:
# cd /sys/kernel/tracing/
# echo sys_sync > set_graph_function
# echo 1 > options/sym-offset
# echo function_graph > current_tracer
Note that the sys_sync filter was there to prevent recording other
functions and the sym-offset option was needed since the first message
was called from a module init function so kallsyms doesn't have the
symbol and omitted in the output.
# cd ~/build/kernel
# insmod samples/trace_printk/trace-printk.ko
# cd -
# head trace
Before:
# tracer: function_graph
#
# CPU DURATION FUNCTION CALLS
# | | | | | | |
1) | /* 0xffffffffa0002000: This is a static string that will use trace_bputs */
1) | /* This is a dynamic string that will use trace_puts */
1) | /* trace_printk_irq_work+0x5/0x7b [trace_printk]: (irq) This is a static string that will use trace_bputs */
1) | /* (irq) This is a dynamic string that will use trace_puts */
1) | /* (irq) This is a static string that will use trace_bprintk() */
1) | /* (irq) This is a dynamic string that will use trace_printk */
After:
# tracer: function_graph
#
# CPU DURATION FUNCTION CALLS
# | | | | | | |
1) | /* This is a static string that will use trace_bputs */
1) | /* This is a dynamic string that will use trace_puts */
1) | /* (irq) This is a static string that will use trace_bputs */
1) | /* (irq) This is a dynamic string that will use trace_puts */
1) | /* (irq) This is a static string that will use trace_bprintk() */
1) | /* (irq) This is a dynamic string that will use trace_printk */
Link: http://lkml.kernel.org/r/20160901024354.13720-1-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace_functions_graph.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c index 7363ccf79512..e14017c36170 100644 --- a/kernel/trace/trace_functions_graph.c +++ b/kernel/trace/trace_functions_graph.c @@ -1120,6 +1120,11 @@ print_graph_comment(struct trace_seq *s, struct trace_entry *ent, trace_seq_puts(s, "/* "); switch (iter->ent->type) { + case TRACE_BPUTS: + ret = trace_print_bputs_msg_only(iter); + if (ret != TRACE_TYPE_HANDLED) + return ret; + break; case TRACE_BPRINT: ret = trace_print_bprintk_msg_only(iter); if (ret != TRACE_TYPE_HANDLED) |