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tracing: Add new trace_marker_raw

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A new file is created:

 /sys/kernel/debug/tracing/trace_marker_raw

This allows for appications to create data structures and write the binary
data directly into it, and then read the trace data out from trace_pipe_raw
into the same type of data structure. This saves on converting numbers into
ASCII that would be required by trace_marker.

Suggested-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt
2016-07-06 15:25:08 -04:00
parent 9648dc1577
commit fa32e8557b
5 changed files with 187 additions and 31 deletions
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30
kernel/trace/trace_output.c
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@@ -1288,6 +1288,35 @@ static struct trace_event trace_print_event = {
.funcs = &trace_print_funcs,
};
static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
struct trace_event *event)
{
struct raw_data_entry *field;
int i;
trace_assign_type(field, iter->ent);
trace_seq_printf(&iter->seq, "# %x buf:", field->id);
for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
trace_seq_printf(&iter->seq, " %02x",
(unsigned char)field->buf[i]);
trace_seq_putc(&iter->seq, '\n');
return trace_handle_return(&iter->seq);
}
static struct trace_event_functions trace_raw_data_funcs = {
.trace = trace_raw_data,
.raw = trace_raw_data,
};
static struct trace_event trace_raw_data_event = {
.type = TRACE_RAW_DATA,
.funcs = &trace_raw_data_funcs,
};
static struct trace_event *events[] __initdata = {
&trace_fn_event,
@@ -1299,6 +1328,7 @@ static struct trace_event *events[] __initdata = {
&trace_bprint_event,
&trace_print_event,
&trace_hwlat_event,
&trace_raw_data_event,
NULL
};