Re: [PATCH 01/32] tracing: Add hist_field_name() accessor

From: Tom Zanussi
Date: Thu Jul 13 2017 - 10:41:58 EST

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In reply to: Piotr Gregor: "RE: [PATCH 01/32] tracing: Add hist_field_name() accessor"
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Hi Piotr,

On Thu, 2017-07-13 at 06:49 +0000, Piotr Gregor wrote:
> Hi Tom,
>
> Which repo and branch do you push these changes into?
>

https://github.com/tzanussi/linux-trace-inter-event.git tzanussi/inter-event-v01

Tom

> cheers,
> Piotr
>
> -----Original Message-----
> From: linux-rt-users-owner@xxxxxxxxxxxxxxx [mailto:linux-rt-users-owner@xxxxxxxxxxxxxxx] On Behalf Of Tom Zanussi
> Sent: 26 June 2017 23:49
> To: rostedt@xxxxxxxxxxx
> Cc: tglx@xxxxxxxxxxxxx; mhiramat@xxxxxxxxxx; namhyung@xxxxxxxxxx; vedang.patel@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-rt-users@xxxxxxxxxxxxxxx; Tom Zanussi <tom.zanussi@xxxxxxxxxxxxxxx>
> Subject: [PATCH 01/32] tracing: Add hist_field_name() accessor
>
> In preparation for hist_fields that won't be strictly based on trace_event_fields, add a new hist_field_name() accessor to allow that flexibility and update associated users.
>
> Signed-off-by: Tom Zanussi <tom.zanussi@xxxxxxxxxxxxxxx>
> ---
> kernel/trace/trace_events_hist.c | 68 +++++++++++++++++++++++++++-------------
> 1 file changed, 46 insertions(+), 22 deletions(-)
>
> diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
> index 1c21d0e..91ffc39 100644
> --- a/kernel/trace/trace_events_hist.c
> +++ b/kernel/trace/trace_events_hist.c
> @@ -146,6 +146,23 @@ struct hist_trigger_data {
> struct tracing_map *map;
> };
>
> +static const char *hist_field_name(struct hist_field *field,
> + unsigned int level)
> +{
> + const char *field_name = "";
> +
> + if (level > 1)
> + return field_name;
> +
> + if (field->field)
> + field_name = field->field->name;
> +
> + if (field_name == NULL)
> + field_name = "";
> +
> + return field_name;
> +}
> +
> static hist_field_fn_t select_value_fn(int field_size, int field_is_signed) {
> hist_field_fn_t fn = NULL;
> @@ -653,7 +670,6 @@ static int is_descending(const char *str) static int create_sort_keys(struct hist_trigger_data *hist_data) {
> char *fields_str = hist_data->attrs->sort_key_str;
> - struct ftrace_event_field *field = NULL;
> struct tracing_map_sort_key *sort_key;
> int descending, ret = 0;
> unsigned int i, j;
> @@ -670,7 +686,9 @@ static int create_sort_keys(struct hist_trigger_data *hist_data)
> }
>
> for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
> + struct hist_field *hist_field;
> char *field_str, *field_name;
> + const char *test_name;
>
> sort_key = &hist_data->sort_keys[i];
>
> @@ -703,8 +721,11 @@ static int create_sort_keys(struct hist_trigger_data *hist_data)
> }
>
> for (j = 1; j < hist_data->n_fields; j++) {
> - field = hist_data->fields[j]->field;
> - if (field && (strcmp(field_name, field->name) == 0)) {
> + hist_field = hist_data->fields[j];
> + test_name = hist_field_name(hist_field, 0);
> + if (test_name == NULL)
> + continue;
> + if (strcmp(field_name, test_name) == 0) {
> sort_key->field_idx = j;
> descending = is_descending(field_str);
> if (descending < 0) {
> @@ -952,6 +973,7 @@ static void hist_trigger_stacktrace_print(struct seq_file *m,
> struct hist_field *key_field;
> char str[KSYM_SYMBOL_LEN];
> bool multiline = false;
> + const char *field_name;
> unsigned int i;
> u64 uval;
>
> @@ -963,26 +985,27 @@ static void hist_trigger_stacktrace_print(struct seq_file *m,
> if (i > hist_data->n_vals)
> seq_puts(m, ", ");
>
> + field_name = hist_field_name(key_field, 0);
> +
> if (key_field->flags & HIST_FIELD_FL_HEX) {
> uval = *(u64 *)(key + key_field->offset);
> - seq_printf(m, "%s: %llx",
> - key_field->field->name, uval);
> + seq_printf(m, "%s: %llx", 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);
> + seq_printf(m, "%s: [%llx] %-45s", 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);
> + seq_printf(m, "%s: [%llx] %-55s", field_name,
> + uval, str);
> } else if (key_field->flags & HIST_FIELD_FL_EXECNAME) {
> char *comm = elt->private_data;
>
> uval = *(u64 *)(key + key_field->offset);
> - seq_printf(m, "%s: %-16s[%10llu]",
> - key_field->field->name, comm, uval);
> + seq_printf(m, "%s: %-16s[%10llu]", field_name,
> + comm, uval);
> } else if (key_field->flags & HIST_FIELD_FL_SYSCALL) {
> const char *syscall_name;
>
> @@ -991,8 +1014,8 @@ static void hist_trigger_stacktrace_print(struct seq_file *m,
> if (!syscall_name)
> syscall_name = "unknown_syscall";
>
> - seq_printf(m, "%s: %-30s[%3llu]",
> - key_field->field->name, syscall_name, uval);
> + seq_printf(m, "%s: %-30s[%3llu]", field_name,
> + syscall_name, uval);
> } else if (key_field->flags & HIST_FIELD_FL_STACKTRACE) {
> seq_puts(m, "stacktrace:\n");
> hist_trigger_stacktrace_print(m,
> @@ -1000,15 +1023,14 @@ static void hist_trigger_stacktrace_print(struct seq_file *m,
> HIST_STACKTRACE_DEPTH);
> multiline = true;
> } else if (key_field->flags & HIST_FIELD_FL_LOG2) {
> - seq_printf(m, "%s: ~ 2^%-2llu", key_field->field->name,
> + seq_printf(m, "%s: ~ 2^%-2llu", field_name,
> *(u64 *)(key + key_field->offset));
> } else if (key_field->flags & HIST_FIELD_FL_STRING) {
> - seq_printf(m, "%s: %-50s", key_field->field->name,
> + seq_printf(m, "%s: %-50s", field_name,
> (char *)(key + key_field->offset));
> } else {
> uval = *(u64 *)(key + key_field->offset);
> - seq_printf(m, "%s: %10llu", key_field->field->name,
> - uval);
> + seq_printf(m, "%s: %10llu", field_name, uval);
> }
> }
>
> @@ -1021,13 +1043,13 @@ static void hist_trigger_stacktrace_print(struct seq_file *m,
> tracing_map_read_sum(elt, HITCOUNT_IDX));
>
> for (i = 1; i < hist_data->n_vals; i++) {
> + field_name = hist_field_name(hist_data->fields[i], 0);
> +
> if (hist_data->fields[i]->flags & HIST_FIELD_FL_HEX) {
> - seq_printf(m, " %s: %10llx",
> - hist_data->fields[i]->field->name,
> + seq_printf(m, " %s: %10llx", field_name,
> tracing_map_read_sum(elt, i));
> } else {
> - seq_printf(m, " %s: %10llu",
> - hist_data->fields[i]->field->name,
> + seq_printf(m, " %s: %10llu", field_name,
> tracing_map_read_sum(elt, i));
> }
> }
> @@ -1142,7 +1164,9 @@ static const char *get_hist_field_flags(struct hist_field *hist_field)
>
> static void hist_field_print(struct seq_file *m, struct hist_field *hist_field) {
> - seq_printf(m, "%s", hist_field->field->name);
> + const char *field_name = hist_field_name(hist_field, 0);
> +
> + seq_printf(m, "%s", field_name);
> if (hist_field->flags) {
> const char *flags_str = get_hist_field_flags(hist_field);
>
> --
> 1.9.3
>
> --
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In reply to: Piotr Gregor: "RE: [PATCH 01/32] tracing: Add hist_field_name() accessor"
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