diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 9ac6089b7513d2278d397aa758c9b8572c2135d2..7bcc32a7e266a9f3c07da1fe9f246eb3e778b187 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -292,6 +292,10 @@ struct hist_trigger_data {
unsigned int n_field_var_str;
struct field_var_hist *field_var_hists[SYNTH_FIELDS_MAX];
unsigned int n_field_var_hists;
+
+ struct field_var *max_vars[SYNTH_FIELDS_MAX];
+ unsigned int n_max_vars;
+ unsigned int n_max_var_str;
};
struct synth_field {
@@ -334,6 +338,14 @@ struct action_data {
char *synth_event_name;
struct synth_event *synth_event;
} onmatch;
+
+ struct {
+ char *var_str;
+ char *fn_name;
+ unsigned int max_var_ref_idx;
+ struct hist_field *max_var;
+ struct hist_field *var;
+ } onmax;
};
};
@@ -1697,7 +1709,8 @@ static int parse_action(char *str, struct hist_trigger_attrs *attrs)
if (attrs->n_actions >= HIST_ACTIONS_MAX)
return ret;
- if ((strncmp(str, "onmatch(", strlen("onmatch(")) == 0)) {
+ if ((strncmp(str, "onmatch(", strlen("onmatch(")) == 0) ||
+ (strncmp(str, "onmax(", strlen("onmax(")) == 0)) {
attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL);
if (!attrs->action_str[attrs->n_actions]) {
ret = -ENOMEM;
@@ -1869,7 +1882,7 @@ static int hist_trigger_elt_data_alloc(struct tracing_map_elt *elt)
}
}
- n_str = hist_data->n_field_var_str;
+ n_str = hist_data->n_field_var_str + hist_data->n_max_var_str;
size = STR_VAR_LEN_MAX;
@@ -2894,6 +2907,15 @@ static void update_field_vars(struct hist_trigger_data *hist_data,
hist_data->n_field_vars, 0);
}
+static void update_max_vars(struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt,
+ struct ring_buffer_event *rbe,
+ void *rec)
+{
+ __update_field_vars(elt, rbe, rec, hist_data->max_vars,
+ hist_data->n_max_vars, hist_data->n_field_var_str);
+}
+
static struct hist_field *create_var(struct hist_trigger_data *hist_data,
struct trace_event_file *file,
char *name, int size, const char *type)
@@ -3023,6 +3045,227 @@ create_target_field_var(struct hist_trigger_data *target_hist_data,
return create_field_var(target_hist_data, file, var_name);
}
+static void onmax_print(struct seq_file *m,
+ struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt,
+ struct action_data *data)
+{
+ unsigned int i, save_var_idx, max_idx = data->onmax.max_var->var.idx;
+
+ seq_printf(m, "\n\tmax: %10llu", tracing_map_read_var(elt, max_idx));
+
+ for (i = 0; i < hist_data->n_max_vars; i++) {
+ struct hist_field *save_val = hist_data->max_vars[i]->val;
+ struct hist_field *save_var = hist_data->max_vars[i]->var;
+ u64 val;
+
+ save_var_idx = save_var->var.idx;
+
+ val = tracing_map_read_var(elt, save_var_idx);
+
+ if (save_val->flags & HIST_FIELD_FL_STRING) {
+ seq_printf(m, " %s: %-32s", save_var->var.name,
+ (char *)(uintptr_t)(val));
+ } else
+ seq_printf(m, " %s: %10llu", save_var->var.name, val);
+ }
+}
+
+static void onmax_save(struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt, void *rec,
+ struct ring_buffer_event *rbe,
+ struct action_data *data, u64 *var_ref_vals)
+{
+ unsigned int max_idx = data->onmax.max_var->var.idx;
+ unsigned int max_var_ref_idx = data->onmax.max_var_ref_idx;
+
+ u64 var_val, max_val;
+
+ var_val = var_ref_vals[max_var_ref_idx];
+ max_val = tracing_map_read_var(elt, max_idx);
+
+ if (var_val <= max_val)
+ return;
+
+ tracing_map_set_var(elt, max_idx, var_val);
+
+ update_max_vars(hist_data, elt, rbe, rec);
+}
+
+static void onmax_destroy(struct action_data *data)
+{
+ unsigned int i;
+
+ destroy_hist_field(data->onmax.max_var, 0);
+ destroy_hist_field(data->onmax.var, 0);
+
+ kfree(data->onmax.var_str);
+ kfree(data->onmax.fn_name);
+
+ for (i = 0; i < data->n_params; i++)
+ kfree(data->params[i]);
+
+ kfree(data);
+}
+
+static int onmax_create(struct hist_trigger_data *hist_data,
+ struct action_data *data)
+{
+ struct trace_event_file *file = hist_data->event_file;
+ struct hist_field *var_field, *ref_field, *max_var;
+ unsigned int var_ref_idx = hist_data->n_var_refs;
+ struct field_var *field_var;
+ char *onmax_var_str, *param;
+ unsigned long flags;
+ unsigned int i;
+ int ret = 0;
+
+ onmax_var_str = data->onmax.var_str;
+ if (onmax_var_str[0] != '$')
+ return -EINVAL;
+ onmax_var_str++;
+
+ var_field = find_target_event_var(hist_data, NULL, NULL, onmax_var_str);
+ if (!var_field)
+ return -EINVAL;
+
+ flags = HIST_FIELD_FL_VAR_REF;
+ ref_field = create_hist_field(hist_data, NULL, flags, NULL);
+ if (!ref_field)
+ return -ENOMEM;
+
+ if (init_var_ref(ref_field, var_field, NULL, NULL)) {
+ destroy_hist_field(ref_field, 0);
+ ret = -ENOMEM;
+ goto out;
+ }
+ hist_data->var_refs[hist_data->n_var_refs] = ref_field;
+ ref_field->var_ref_idx = hist_data->n_var_refs++;
+ data->onmax.var = ref_field;
+
+ data->fn = onmax_save;
+ data->onmax.max_var_ref_idx = var_ref_idx;
+ max_var = create_var(hist_data, file, "max", sizeof(u64), "u64");
+ if (IS_ERR(max_var)) {
+ ret = PTR_ERR(max_var);
+ goto out;
+ }
+ data->onmax.max_var = max_var;
+
+ for (i = 0; i < data->n_params; i++) {
+ param = kstrdup(data->params[i], GFP_KERNEL);
+ if (!param) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ field_var = create_target_field_var(hist_data, NULL, NULL, param);
+ if (IS_ERR(field_var)) {
+ ret = PTR_ERR(field_var);
+ kfree(param);
+ goto out;
+ }
+
+ hist_data->max_vars[hist_data->n_max_vars++] = field_var;
+ if (field_var->val->flags & HIST_FIELD_FL_STRING)
+ hist_data->n_max_var_str++;
+
+ kfree(param);
+ }
+ out:
+ return ret;
+}
+
+static int parse_action_params(char *params, struct action_data *data)
+{
+ char *param, *saved_param;
+ int ret = 0;
+
+ while (params) {
+ if (data->n_params >= SYNTH_FIELDS_MAX)
+ goto out;
+
+ param = strsep(¶ms, ",");
+ if (!param) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ param = strstrip(param);
+ if (strlen(param) < 2) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ saved_param = kstrdup(param, GFP_KERNEL);
+ if (!saved_param) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ data->params[data->n_params++] = saved_param;
+ }
+ out:
+ return ret;
+}
+
+static struct action_data *onmax_parse(char *str)
+{
+ char *onmax_fn_name, *onmax_var_str;
+ struct action_data *data;
+ int ret = -EINVAL;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return ERR_PTR(-ENOMEM);
+
+ onmax_var_str = strsep(&str, ")");
+ if (!onmax_var_str || !str) {
+ ret = -EINVAL;
+ goto free;
+ }
+
+ data->onmax.var_str = kstrdup(onmax_var_str, GFP_KERNEL);
+ if (!data->onmax.var_str) {
+ ret = -ENOMEM;
+ goto free;
+ }
+
+ strsep(&str, ".");
+ if (!str)
+ goto free;
+
+ onmax_fn_name = strsep(&str, "(");
+ if (!onmax_fn_name || !str)
+ goto free;
+
+ if (strncmp(onmax_fn_name, "save", strlen("save")) == 0) {
+ char *params = strsep(&str, ")");
+
+ if (!params) {
+ ret = -EINVAL;
+ goto free;
+ }
+
+ ret = parse_action_params(params, data);
+ if (ret)
+ goto free;
+ } else
+ goto free;
+
+ data->onmax.fn_name = kstrdup(onmax_fn_name, GFP_KERNEL);
+ if (!data->onmax.fn_name) {
+ ret = -ENOMEM;
+ goto free;
+ }
+ out:
+ return data;
+ free:
+ onmax_destroy(data);
+ data = ERR_PTR(ret);
+ goto out;
+}
+
static void onmatch_destroy(struct action_data *data)
{
unsigned int i;
@@ -3107,39 +3350,6 @@ static int check_synth_field(struct synth_event *event,
return 0;
}
-static int parse_action_params(char *params, struct action_data *data)
-{
- char *param, *saved_param;
- int ret = 0;
-
- while (params) {
- if (data->n_params >= SYNTH_FIELDS_MAX)
- goto out;
-
- param = strsep(¶ms, ",");
- if (!param) {
- ret = -EINVAL;
- goto out;
- }
-
- param = strstrip(param);
- if (strlen(param) < 2) {
- ret = -EINVAL;
- goto out;
- }
-
- saved_param = kstrdup(param, GFP_KERNEL);
- if (!saved_param) {
- ret = -ENOMEM;
- goto out;
- }
-
- data->params[data->n_params++] = saved_param;
- }
- out:
- return ret;
-}
-
static struct hist_field *
onmatch_find_var(struct hist_trigger_data *hist_data, struct action_data *data,
char *system, char *event, char *var)
@@ -3796,6 +4006,8 @@ static void destroy_actions(struct hist_trigger_data *hist_data)
if (data->fn == action_trace)
onmatch_destroy(data);
+ else if (data->fn == onmax_save)
+ onmax_destroy(data);
else
kfree(data);
}
@@ -3821,6 +4033,15 @@ static int parse_actions(struct hist_trigger_data *hist_data)
break;
}
data->fn = action_trace;
+ } else if (strncmp(str, "onmax(", strlen("onmax(")) == 0) {
+ char *action_str = str + strlen("onmax(");
+
+ data = onmax_parse(action_str);
+ if (IS_ERR(data)) {
+ ret = PTR_ERR(data);
+ break;
+ }
+ data->fn = onmax_save;
} else {
ret = -EINVAL;
break;
@@ -3846,12 +4067,48 @@ static int create_actions(struct hist_trigger_data *hist_data,
ret = onmatch_create(hist_data, file, data);
if (ret)
return ret;
+ } else if (data->fn == onmax_save) {
+ ret = onmax_create(hist_data, data);
+ if (ret)
+ return ret;
}
}
return ret;
}
+static void print_actions(struct seq_file *m,
+ struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt)
+{
+ unsigned int i;
+
+ for (i = 0; i < hist_data->n_actions; i++) {
+ struct action_data *data = hist_data->actions[i];
+
+ if (data->fn == onmax_save)
+ onmax_print(m, hist_data, elt, data);
+ }
+}
+
+static void print_onmax_spec(struct seq_file *m,
+ struct hist_trigger_data *hist_data,
+ struct action_data *data)
+{
+ unsigned int i;
+
+ seq_puts(m, ":onmax(");
+ seq_printf(m, "%s", data->onmax.var_str);
+ seq_printf(m, ").%s(", data->onmax.fn_name);
+
+ for (i = 0; i < hist_data->n_max_vars; i++) {
+ seq_printf(m, "%s", hist_data->max_vars[i]->var->var.name);
+ if (i < hist_data->n_max_vars - 1)
+ seq_puts(m, ",");
+ }
+ seq_puts(m, ")");
+}
+
static void print_onmatch_spec(struct seq_file *m,
struct hist_trigger_data *hist_data,
struct action_data *data)
@@ -3882,6 +4139,8 @@ static void print_actions_spec(struct seq_file *m,
if (data->fn == action_trace)
print_onmatch_spec(m, hist_data, data);
+ else if (data->fn == onmax_save)
+ print_onmax_spec(m, hist_data, data);
}
}
@@ -4263,6 +4522,8 @@ hist_trigger_entry_print(struct seq_file *m,
}
}
+ print_actions(m, hist_data, elt);
+
seq_puts(m, "\n");
}