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Subject[PATCH] ftrace: Add dump iteator
Date
This iteator doesn't print headers and tracer information in
the ouput trace file. This can be obtained to get a dmesg style
trace output file. Also can be used to dump binary data to via
trace

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

---
kernel/trace/trace.c | 92 ++++++++++++++++++++++++++++++++++++++++++--------
kernel/trace/trace.h | 1 +
2 files changed, 79 insertions(+), 14 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f6e21d8..c0d1170 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -263,6 +263,7 @@ static const char *trace_options[] = {
"branch",
#endif
"annotate",
+ "dump",
NULL
};

@@ -2038,6 +2039,77 @@ static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
return 1;
}

+static enum print_line_t print_dump_fmt(struct trace_iterator *iter)
+{
+ struct trace_seq *s = &iter->seq;
+ struct trace_entry *entry;
+
+ entry = iter->ent;
+
+ if (entry->type == TRACE_CONT)
+ return TRACE_TYPE_HANDLED;
+
+
+ switch (entry->type) {
+ case TRACE_FN: {
+ struct ftrace_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_FIELD_RET(s, entry->pid);
+ SEQ_PUT_FIELD_RET(s, iter->cpu);
+ SEQ_PUT_FIELD_RET(s, iter->ts);
+
+ SEQ_PUT_FIELD_RET(s, field->ip);
+ SEQ_PUT_FIELD_RET(s, field->parent_ip);
+ break;
+ }
+ case TRACE_CTX: {
+ struct ctx_switch_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_FIELD_RET(s, entry->pid);
+ SEQ_PUT_FIELD_RET(s, iter->cpu);
+ SEQ_PUT_FIELD_RET(s, iter->ts);
+
+ SEQ_PUT_FIELD_RET(s, field->prev_pid);
+ SEQ_PUT_FIELD_RET(s, field->prev_prio);
+ SEQ_PUT_FIELD_RET(s, field->prev_state);
+ SEQ_PUT_FIELD_RET(s, field->next_pid);
+ SEQ_PUT_FIELD_RET(s, field->next_prio);
+ SEQ_PUT_FIELD_RET(s, field->next_state);
+ break;
+ }
+ case TRACE_SPECIAL:
+ case TRACE_STACK: {
+ struct special_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_FIELD_RET(s, entry->pid);
+ SEQ_PUT_FIELD_RET(s, iter->cpu);
+ SEQ_PUT_FIELD_RET(s, iter->ts);
+
+ SEQ_PUT_FIELD_RET(s, field->arg1);
+ SEQ_PUT_FIELD_RET(s, field->arg2);
+ SEQ_PUT_FIELD_RET(s, field->arg3);
+ break;
+ }
+ case TRACE_PRINT: {
+ struct print_entry *field;
+
+ trace_assign_type(field, entry);
+
+ trace_seq_printf(s, "%s", field->buf);
+ if (entry->flags & TRACE_FLAG_CONT)
+ trace_seq_print_cont(s, iter);
+ break;
+ }
+ }
+ return TRACE_TYPE_HANDLED;
+}
+
static int trace_empty(struct trace_iterator *iter)
{
int cpu;
@@ -2074,6 +2146,9 @@ static enum print_line_t print_trace_line(struct trace_iterator *iter)
if (trace_flags & TRACE_ITER_RAW)
return print_raw_fmt(iter);

+ if (trace_flags & TRACE_ITER_DUMP)
+ return print_dump_fmt(iter);
+
if (iter->iter_flags & TRACE_FILE_LAT_FMT)
return print_lat_fmt(iter, iter->idx, iter->cpu);

@@ -2083,24 +2158,12 @@ static enum print_line_t print_trace_line(struct trace_iterator *iter)
static int s_bin_show(struct seq_file *m, void *v)
{
int len;
- enum print_line_t ret;
struct trace_iterator *iter = v;

if (iter->ent == NULL)
return 0;

- if (iter->trace && iter->trace->print_line) {
- ret = iter->trace->print_line(iter);
- if (ret != TRACE_TYPE_UNHANDLED)
- goto trace_handled;
- }
- /*
- * If trace type is unhandled or if we don't have
- * a print_line call the standard bin_fmt callback
- */
- print_bin_fmt(iter);
-
-trace_handled:
+ print_trace_line(iter);
/* copy the trace buffer to seq file buffer */
if (iter->seq.len >= PAGE_SIZE)
len = PAGE_SIZE - 1;
@@ -2122,7 +2185,8 @@ static int s_show(struct seq_file *m, void *v)
{
struct trace_iterator *iter = v;

- if (trace_flags & TRACE_ITER_BIN)
+ if ((trace_flags & TRACE_ITER_BIN) ||
+ (trace_flags & TRACE_ITER_DUMP))
return s_bin_show(m, v);

if (iter->ent == NULL) {
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 790ea8c..358d2a6 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -474,6 +474,7 @@ enum trace_iterator_flags {
TRACE_ITER_BRANCH = 0x1000,
#endif
TRACE_ITER_ANNOTATE = 0x2000,
+ TRACE_ITER_DUMP = 0x4000,
};

/*
--
tg: (47b0062..) an/ftrace-dump-iterator.patch (depends on: an/ftrace-bin-iterator.patch)

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