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author | Tom Zanussi <tom.zanussi@linux.intel.com> | 2016-03-03 19:54:48 +0100 |
---|---|---|
committer | Steven Rostedt <rostedt@goodmis.org> | 2016-04-19 18:17:43 +0200 |
commit | 0c4a6b4666e8eb86dead3f09b40bb8ca4f614e4f (patch) | |
tree | abb83cab8f77ce6c89bb07acccedde111632f4d7 /kernel/trace/trace_events_hist.c | |
parent | tracing: Add hist trigger support for clearing a trace (diff) | |
download | linux-0c4a6b4666e8eb86dead3f09b40bb8ca4f614e4f.tar.xz linux-0c4a6b4666e8eb86dead3f09b40bb8ca4f614e4f.zip |
tracing: Add hist trigger 'hex' modifier for displaying numeric fields
Allow users to have numeric fields displayed as hex values in the
output by appending '.hex' to field names:
# echo hist:keys=aaa,bbb.hex:vals=ccc.hex ... \
[ if filter] > event/trigger
Link: http://lkml.kernel.org/r/67bd431edda2af5798d7694818f7e8d71b6b3463.1457029949.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/trace_events_hist.c')
-rw-r--r-- | kernel/trace/trace_events_hist.c | 62 |
1 files changed, 56 insertions, 6 deletions
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 83cb25e067ad..8e49eeef8867 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -80,6 +80,7 @@ enum hist_field_flags { HIST_FIELD_FL_HITCOUNT = 1, HIST_FIELD_FL_KEY = 2, HIST_FIELD_FL_STRING = 4, + HIST_FIELD_FL_HEX = 8, }; struct hist_trigger_attrs { @@ -303,11 +304,23 @@ static int create_val_field(struct hist_trigger_data *hist_data, { struct ftrace_event_field *field = NULL; unsigned long flags = 0; + char *field_name; int ret = 0; if (WARN_ON(val_idx >= TRACING_MAP_VALS_MAX)) return -EINVAL; - field = trace_find_event_field(file->event_call, field_str); + + field_name = strsep(&field_str, "."); + if (field_str) { + if (strcmp(field_str, "hex") == 0) + flags |= HIST_FIELD_FL_HEX; + else { + ret = -EINVAL; + goto out; + } + } + + field = trace_find_event_field(file->event_call, field_name); if (!field) { ret = -EINVAL; goto out; @@ -372,6 +385,7 @@ static int create_key_field(struct hist_trigger_data *hist_data, struct ftrace_event_field *field = NULL; unsigned long flags = 0; unsigned int key_size; + char *field_name; int ret = 0; if (WARN_ON(key_idx >= TRACING_MAP_FIELDS_MAX)) @@ -379,7 +393,17 @@ static int create_key_field(struct hist_trigger_data *hist_data, flags |= HIST_FIELD_FL_KEY; - field = trace_find_event_field(file->event_call, field_str); + field_name = strsep(&field_str, "."); + if (field_str) { + if (strcmp(field_str, "hex") == 0) + flags |= HIST_FIELD_FL_HEX; + else { + ret = -EINVAL; + goto out; + } + } + + field = trace_find_event_field(file->event_call, field_name); if (!field) { ret = -EINVAL; goto out; @@ -713,7 +737,11 @@ hist_trigger_entry_print(struct seq_file *m, if (i > hist_data->n_vals) seq_puts(m, ", "); - if (key_field->flags & HIST_FIELD_FL_STRING) { + if (key_field->flags & HIST_FIELD_FL_HEX) { + uval = *(u64 *)(key + key_field->offset); + seq_printf(m, "%s: %llx", + key_field->field->name, uval); + } else if (key_field->flags & HIST_FIELD_FL_STRING) { seq_printf(m, "%s: %-50s", key_field->field->name, (char *)(key + key_field->offset)); } else { @@ -729,9 +757,15 @@ hist_trigger_entry_print(struct seq_file *m, tracing_map_read_sum(elt, HITCOUNT_IDX)); for (i = 1; i < hist_data->n_vals; i++) { - seq_printf(m, " %s: %10llu", - hist_data->fields[i]->field->name, - tracing_map_read_sum(elt, i)); + if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) { + seq_printf(m, " %s: %10llx", + hist_data->fields[i]->field->name, + tracing_map_read_sum(elt, i)); + } else { + seq_printf(m, " %s: %10llu", + hist_data->fields[i]->field->name, + tracing_map_read_sum(elt, i)); + } } seq_puts(m, "\n"); @@ -816,9 +850,25 @@ const struct file_operations event_hist_fops = { .release = single_release, }; +static const char *get_hist_field_flags(struct hist_field *hist_field) +{ + const char *flags_str = NULL; + + if (hist_field->flags & HIST_FIELD_FL_HEX) + flags_str = "hex"; + + return flags_str; +} + static void hist_field_print(struct seq_file *m, struct hist_field *hist_field) { seq_printf(m, "%s", hist_field->field->name); + if (hist_field->flags) { + const char *flags_str = get_hist_field_flags(hist_field); + + if (flags_str) + seq_printf(m, ".%s", flags_str); + } } static int event_hist_trigger_print(struct seq_file *m, |