Function report |
Source Code:kernel\trace\trace_events_hist.c |
Create Date:2022-07-28 12:30:18 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:create_hist_field
Proto:static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data, struct ftrace_event_field *field, unsigned long flags, char *var_name)
Type:struct hist_field
Parameter:
Type | Parameter | Name |
---|---|---|
struct hist_trigger_data * | hist_data | |
struct ftrace_event_field * | field | |
unsigned long | flags | |
char * | var_name |
2473 | If field && is_function_field(field) Then Return NULL |
2476 | hist_field = kzalloc - allocate memory. The memory is set to zero.*@size: how many bytes of memory are required.*@flags: the type of memory to allocate (see kmalloc). |
2477 | If Not hist_field Then Return NULL |
2480 | ref = 1 |
2484 | If flags & HIST_FIELD_FL_EXPR || flags & HIST_FIELD_FL_ALIAS Then Go to out |
2487 | If flags & HIST_FIELD_FL_VAR_REF Then |
2488 | fn = hist_field_var_ref |
2489 | Go to out |
2492 | If flags & HIST_FIELD_FL_HITCOUNT Then |
2501 | If flags & HIST_FIELD_FL_STACKTRACE Then |
2502 | fn = hist_field_none |
2503 | Go to out |
2506 | If flags & HIST_FIELD_FL_LOG2 Then |
2507 | fl = flags & ~HIST_FIELD_FL_LOG2 |
2508 | fn = hist_field_log2 |
2509 | operands[0] = create_hist_field(hist_data, field, fl, NULL) |
2511 | type = kstrdup(type, GFP_KERNEL) |
2514 | Go to out |
2517 | If flags & HIST_FIELD_FL_TIMESTAMP Then |
2526 | If flags & HIST_FIELD_FL_CPU Then |
2535 | If WARN_ON_ONCE(!field) Then Go to out |
2538 | If is_string_field(field) Then |
2539 | flags |= HIST_FIELD_FL_STRING |
2542 | type = kstrdup(type, GFP_KERNEL) |
2546 | If filter_type == FILTER_STATIC_STRING Then fn = hist_field_string |
2548 | Else if filter_type == FILTER_DYN_STRING Then fn = hist_field_dynstring |
2550 | Else fn = hist_field_pstring |
2552 | Else |
2555 | type = kstrdup(type, GFP_KERNEL) |
2559 | fn = select_value_fn(size, is_signed) |
2561 | If Not fn Then |
2562 | destroy_hist_field(hist_field, 0) |
2563 | Return NULL |
2566 | out : |
2570 | If var_name Then |
2576 | Return hist_field |
2577 | free : |
2578 | destroy_hist_field(hist_field, 0) |
2579 | Return NULL |
Name | Describe |
---|---|
create_hist_field | |
create_var_ref | reate_var_ref - Create a variable reference and attach it to trigger*@hist_data: The trigger that will be referencing the variable*@var_field: The VAR field to create a reference to*@system: The optional system string*@event_name: The optional event_name |
create_alias | |
parse_atom | |
parse_unary | |
parse_expr | |
create_hitcount_val | |
create_key_field |
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