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Date: Tue, 21 Jul 2015 09:10:34 -0500
From: Tom Zanussi <tom.zanussi@...ux.intel.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: rostedt@...dmis.org, daniel.wagner@...-carit.de,
masami.hiramatsu.pt@...achi.com, josh@...htriplett.org,
andi@...stfloor.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 14/22] tracing: Add hist trigger 'hex' modifier for
displaying numeric fields
Hi Namhyung,
On Sun, 2015-07-19 at 22:22 +0900, Namhyung Kim wrote:
> Hi Tom,
>
> On Thu, Jul 16, 2015 at 12:22:47PM -0500, Tom Zanussi wrote:
> > 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
> >
> > Signed-off-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
> > ---
> > kernel/trace/trace.c | 5 +++-
> > kernel/trace/trace_events_hist.c | 49 +++++++++++++++++++++++++++++++++++++---
> > 2 files changed, 50 insertions(+), 4 deletions(-)
> >
> > diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> > index 27daa28..14f9472 100644
> > --- a/kernel/trace/trace.c
> > +++ b/kernel/trace/trace.c
> > @@ -3810,7 +3810,10 @@ static const char readme_msg[] =
> > "\t entry is a simple list of the keys and values comprising the\n"
> > "\t entry; keys are printed first and are delineated by curly\n"
> > "\t braces, and are followed by the set of value fields for the\n"
> > - "\t entry. Numeric fields are displayed as base-10 integers.\n"
> > + "\t entry. By default, numeric fields are displayed as base-10\n"
> > + "\t integers. This can be modified by appending any of the\n"
> > + "\t following modifiers to the field name:\n\n"
> > + "\t .hex display a number as a hex value\n\n"
> > "\t By default, the size of the hash table is 2048 entries. The\n"
> > "\t 'size' param can be used to specify more or fewer than that.\n"
> > "\t The units are in terms of hashtable entries - if a run uses\n"
> > diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
> > index d8259fe..9cc38ee 100644
> > --- a/kernel/trace/trace_events_hist.c
> > +++ b/kernel/trace/trace_events_hist.c
> > @@ -72,6 +72,7 @@ enum hist_field_flags {
> > HIST_FIELD_HITCOUNT = 1,
> > HIST_FIELD_KEY = 2,
> > HIST_FIELD_STRING = 4,
> > + HIST_FIELD_HEX = 8,
> > };
> >
> > struct hist_trigger_attrs {
> > @@ -284,9 +285,20 @@ 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;
> >
> > - field = trace_find_event_field(file->event_call, field_str);
> > + field_name = strsep(&field_str, ".");
> > + if (field_str) {
> > + if (!strcmp(field_str, "hex"))
> > + flags |= HIST_FIELD_HEX;
> > + else {
> > + ret = -EINVAL;
> > + goto out;
> > + }
> > + }
> > +
> > + field = trace_find_event_field(file->event_call, field_name);
> > if (!field) {
> > ret = -EINVAL;
> > goto out;
> > @@ -349,11 +361,22 @@ 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;
> >
> > flags |= HIST_FIELD_KEY;
> >
> > - field = trace_find_event_field(file->event_call, field_str);
> > + field_name = strsep(&field_str, ".");
> > + if (field_str) {
> > + if (!strcmp(field_str, "hex"))
> > + flags |= HIST_FIELD_HEX;
> > + else {
> > + ret = -EINVAL;
> > + goto out;
> > + }
> > + }
> > +
> > + field = trace_find_event_field(file->event_call, field_name);
> > if (!field) {
> > ret = -EINVAL;
> > goto out;
> > @@ -688,7 +711,11 @@ hist_trigger_entry_print(struct seq_file *m,
> > if (i > hist_data->n_vals)
> > seq_puts(m, ", ");
> >
> > - if (key_field->flags & HIST_FIELD_STRING) {
> > + if (key_field->flags & HIST_FIELD_HEX) {
> > + uval = *(u64 *)(key + key_field->offset);
> > + seq_printf(m, "%s: %llx",
> > + key_field->field->name, uval);
> > + } else if (key_field->flags & HIST_FIELD_STRING) {
> > seq_printf(m, "%s: %-35s", key_field->field->name,
> > (char *)(key + key_field->offset));
> > } else {
>
> It seems the '.hex' modifier only affects key fields' output..
>
Yeah, the .hex modifier seems to have gotten dropped for values in the
patch splitup. Will fix, thanks for pointing it out.
Tom
> Thanks,
> Namhyung
>
>
> > @@ -791,9 +818,25 @@ 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_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,
> > --
> > 1.9.3
> >
--
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