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authorTom Zanussi <tom.zanussi@linux.intel.com>2016-03-03 12:54:49 -0600
committerSteven Rostedt <rostedt@goodmis.org>2016-04-19 12:17:51 -0400
commitc6afad49d127f6d7c9957319f55173a2198b1ba8 (patch)
tree7590e1bd4a973d09ed4739d494ca786e59d6fbb5 /kernel/trace
parent0c4a6b4666e8eb86dead3f09b40bb8ca4f614e4f (diff)
downloadlinux-sh-c6afad49d127f6d7c9957319f55173a2198b1ba8.tar.gz
tracing: Add hist trigger 'sym' and 'sym-offset' modifiers
Allow users to have address fields displayed as symbols in the output by appending '.sym' or 'sym-offset' to field names: # echo hist:keys=aaa.sym,bbb.sym-offset ... \ [ if filter] > event/trigger Link: http://lkml.kernel.org/r/87d4935821491c0275513f0fbfb9bab8d3d3f079.1457029949.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Reviewed-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.c4
-rw-r--r--kernel/trace/trace_events_hist.c29
2 files changed, 28 insertions, 5 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 2eb2eafbe7f5..34459eb0c844 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3855,7 +3855,9 @@ static const char readme_msg[] =
"\t table in its entirety to stdout. The default format used to\n"
"\t display a given field can be modified by appending any of the\n"
"\t following modifiers to the field name, as applicable:\n\n"
- "\t .hex display a number as a hex value\n\n"
+ "\t .hex display a number as a hex value\n"
+ "\t .sym display an address as a symbol\n"
+ "\t .sym-offset display an address as a symbol and offset\n\n"
"\t The 'pause' parameter can be used to pause an existing hist\n"
"\t trigger or to start a hist trigger but not log any events\n"
"\t until told to do so. 'continue' can be used to start or\n"
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 8e49eeef8867..808cc06cdb61 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -77,10 +77,12 @@ DEFINE_HIST_FIELD_FN(u8);
#define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + sizeof(u64))
enum hist_field_flags {
- HIST_FIELD_FL_HITCOUNT = 1,
- HIST_FIELD_FL_KEY = 2,
- HIST_FIELD_FL_STRING = 4,
- HIST_FIELD_FL_HEX = 8,
+ HIST_FIELD_FL_HITCOUNT = 1,
+ HIST_FIELD_FL_KEY = 2,
+ HIST_FIELD_FL_STRING = 4,
+ HIST_FIELD_FL_HEX = 8,
+ HIST_FIELD_FL_SYM = 16,
+ HIST_FIELD_FL_SYM_OFFSET = 32,
};
struct hist_trigger_attrs {
@@ -397,6 +399,10 @@ static int create_key_field(struct hist_trigger_data *hist_data,
if (field_str) {
if (strcmp(field_str, "hex") == 0)
flags |= HIST_FIELD_FL_HEX;
+ else if (strcmp(field_str, "sym") == 0)
+ flags |= HIST_FIELD_FL_SYM;
+ else if (strcmp(field_str, "sym-offset") == 0)
+ flags |= HIST_FIELD_FL_SYM_OFFSET;
else {
ret = -EINVAL;
goto out;
@@ -726,6 +732,7 @@ hist_trigger_entry_print(struct seq_file *m,
struct tracing_map_elt *elt)
{
struct hist_field *key_field;
+ char str[KSYM_SYMBOL_LEN];
unsigned int i;
u64 uval;
@@ -741,6 +748,16 @@ hist_trigger_entry_print(struct seq_file *m,
uval = *(u64 *)(key + key_field->offset);
seq_printf(m, "%s: %llx",
key_field->field->name, uval);
+ } else if (key_field->flags & HIST_FIELD_FL_SYM) {
+ uval = *(u64 *)(key + key_field->offset);
+ sprint_symbol_no_offset(str, uval);
+ seq_printf(m, "%s: [%llx] %-45s",
+ key_field->field->name, uval, str);
+ } else if (key_field->flags & HIST_FIELD_FL_SYM_OFFSET) {
+ uval = *(u64 *)(key + key_field->offset);
+ sprint_symbol(str, uval);
+ seq_printf(m, "%s: [%llx] %-55s",
+ key_field->field->name, uval, str);
} else if (key_field->flags & HIST_FIELD_FL_STRING) {
seq_printf(m, "%s: %-50s", key_field->field->name,
(char *)(key + key_field->offset));
@@ -856,6 +873,10 @@ static const char *get_hist_field_flags(struct hist_field *hist_field)
if (hist_field->flags & HIST_FIELD_FL_HEX)
flags_str = "hex";
+ else if (hist_field->flags & HIST_FIELD_FL_SYM)
+ flags_str = "sym";
+ else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
+ flags_str = "sym-offset";
return flags_str;
}