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-rw-r--r--kernel/trace/trace.c3
-rw-r--r--kernel/trace/trace_events_hist.c77
2 files changed, 63 insertions, 17 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 08e9568849b1..55aec4616d8b 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5725,7 +5725,8 @@ static const char readme_msg[] =
"\t .log2 display log2 value rather than raw number\n"
"\t .buckets=size display values in groups of size rather than raw number\n"
"\t .usecs display a common_timestamp in microseconds\n"
- "\t .percent display a number of percentage value\n\n"
+ "\t .percent display a number of percentage value\n"
+ "\t .graph display a bar-graph of a value\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 35b0e956f06e..946b2b8f0f2c 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -507,6 +507,7 @@ enum hist_field_flags {
HIST_FIELD_FL_BUCKET = 1 << 17,
HIST_FIELD_FL_CONST = 1 << 18,
HIST_FIELD_FL_PERCENT = 1 << 19,
+ HIST_FIELD_FL_GRAPH = 1 << 20,
};
struct var_defs {
@@ -1710,6 +1711,8 @@ static const char *get_hist_field_flags(struct hist_field *hist_field)
flags_str = "usecs";
else if (hist_field->flags & HIST_FIELD_FL_PERCENT)
flags_str = "percent";
+ else if (hist_field->flags & HIST_FIELD_FL_GRAPH)
+ flags_str = "graph";
return flags_str;
}
@@ -2322,6 +2325,10 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY))
goto error;
*flags |= HIST_FIELD_FL_PERCENT;
+ } else if (strncmp(modifier, "graph", 5) == 0) {
+ if (*flags & (HIST_FIELD_FL_VAR | HIST_FIELD_FL_KEY))
+ goto error;
+ *flags |= HIST_FIELD_FL_GRAPH;
} else {
error:
hist_err(tr, HIST_ERR_BAD_FIELD_MODIFIER, errpos(modifier));
@@ -5316,20 +5323,52 @@ div0:
return val ? UINT_MAX : 0;
}
+#define BAR_CHAR '#'
+
+static inline const char *__fill_bar_str(char *buf, int size, u64 val, u64 max)
+{
+ unsigned int len = __get_percentage(val, max);
+ int i;
+
+ if (len == UINT_MAX) {
+ snprintf(buf, size, "[ERROR]");
+ return buf;
+ }
+
+ len = len * size / 10000;
+ for (i = 0; i < len && i < size; i++)
+ buf[i] = BAR_CHAR;
+ while (i < size)
+ buf[i++] = ' ';
+ buf[size] = '\0';
+
+ return buf;
+}
+
+struct hist_val_stat {
+ u64 max;
+ u64 total;
+};
+
static void hist_trigger_print_val(struct seq_file *m, unsigned int idx,
const char *field_name, unsigned long flags,
- u64 *totals, struct tracing_map_elt *elt)
+ struct hist_val_stat *stats,
+ struct tracing_map_elt *elt)
{
u64 val = tracing_map_read_sum(elt, idx);
unsigned int pc;
+ char bar[21];
if (flags & HIST_FIELD_FL_PERCENT) {
- pc = __get_percentage(val, totals[idx]);
+ pc = __get_percentage(val, stats[idx].total);
if (pc == UINT_MAX)
seq_printf(m, " %s (%%):[ERROR]", field_name);
else
seq_printf(m, " %s (%%): %3u.%02u", field_name,
pc / 100, pc % 100);
+ } else if (flags & HIST_FIELD_FL_GRAPH) {
+ seq_printf(m, " %s: %20s", field_name,
+ __fill_bar_str(bar, 20, val, stats[idx].max));
} else if (flags & HIST_FIELD_FL_HEX) {
seq_printf(m, " %s: %10llx", field_name, val);
} else {
@@ -5339,7 +5378,7 @@ static void hist_trigger_print_val(struct seq_file *m, unsigned int idx,
static void hist_trigger_entry_print(struct seq_file *m,
struct hist_trigger_data *hist_data,
- u64 *totals,
+ struct hist_val_stat *stats,
void *key,
struct tracing_map_elt *elt)
{
@@ -5350,7 +5389,7 @@ static void hist_trigger_entry_print(struct seq_file *m,
hist_trigger_print_key(m, hist_data, key, elt);
/* At first, show the raw hitcount always */
- hist_trigger_print_val(m, i, "hitcount", 0, totals, elt);
+ hist_trigger_print_val(m, i, "hitcount", 0, stats, elt);
for (i = 1; i < hist_data->n_vals; i++) {
field_name = hist_field_name(hist_data->fields[i], 0);
@@ -5360,7 +5399,7 @@ static void hist_trigger_entry_print(struct seq_file *m,
continue;
seq_puts(m, " ");
- hist_trigger_print_val(m, i, field_name, flags, totals, elt);
+ hist_trigger_print_val(m, i, field_name, flags, stats, elt);
}
print_actions(m, hist_data, elt);
@@ -5374,7 +5413,8 @@ static int print_entries(struct seq_file *m,
struct tracing_map_sort_entry **sort_entries = NULL;
struct tracing_map *map = hist_data->map;
int i, j, n_entries;
- u64 *totals = NULL;
+ struct hist_val_stat *stats = NULL;
+ u64 val;
n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
hist_data->n_sort_keys,
@@ -5382,28 +5422,33 @@ static int print_entries(struct seq_file *m,
if (n_entries < 0)
return n_entries;
+ /* Calculate the max and the total for each field if needed. */
for (j = 0; j < hist_data->n_vals; j++) {
- if (!(hist_data->fields[j]->flags & HIST_FIELD_FL_PERCENT))
+ if (!(hist_data->fields[j]->flags &
+ (HIST_FIELD_FL_PERCENT | HIST_FIELD_FL_GRAPH)))
continue;
- if (!totals) {
- totals = kcalloc(hist_data->n_vals, sizeof(u64),
- GFP_KERNEL);
- if (!totals) {
+ if (!stats) {
+ stats = kcalloc(hist_data->n_vals, sizeof(*stats),
+ GFP_KERNEL);
+ if (!stats) {
n_entries = -ENOMEM;
goto out;
}
}
- for (i = 0; i < n_entries; i++)
- totals[j] += tracing_map_read_sum(
- sort_entries[i]->elt, j);
+ for (i = 0; i < n_entries; i++) {
+ val = tracing_map_read_sum(sort_entries[i]->elt, j);
+ stats[j].total += val;
+ if (stats[j].max < val)
+ stats[j].max = val;
+ }
}
for (i = 0; i < n_entries; i++)
- hist_trigger_entry_print(m, hist_data, totals,
+ hist_trigger_entry_print(m, hist_data, stats,
sort_entries[i]->key,
sort_entries[i]->elt);
- kfree(totals);
+ kfree(stats);
out:
tracing_map_destroy_sort_entries(sort_entries, n_entries);
generated by cgit (git 2.34.1) at 2024-06-09 10:05:36 +0000