kernel/trace/trace_output.c

Source file repositories/reference/linux-study-clean/kernel/trace/trace_output.c

File Facts

System
Linux kernel
Corpus path
kernel/trace/trace_output.c
Extension
.c
Size
45579 bytes
Lines
1935
Domain
Core OS
Bucket
Scheduler, Processes, Timers, Sync, And Syscalls
Inferred role
Core OS: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (el_size) {
		case 1:
			trace_seq_printf(p, "%s0x%x", prefix,
					 *(u8 *)ptr);
			break;
		case 2:
			trace_seq_printf(p, "%s0x%x", prefix,
					 *(u16 *)ptr);
			break;
		case 4:
			trace_seq_printf(p, "%s0x%x", prefix,
					 *(u32 *)ptr);
			break;
		case 8:
			trace_seq_printf(p, "%s0x%llx", prefix,
					 *(u64 *)ptr);
			break;
		default:
			trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
					 *(u8 *)ptr);
			el_size = 1;
		}
		prefix = ",";
		ptr += el_size;
	}

	trace_seq_putc(p, '}');
	trace_seq_putc(p, 0);

	return ret;
}
EXPORT_SYMBOL(trace_print_array_seq);

const char *
trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
			 int prefix_type, int rowsize, int groupsize,
			 const void *buf, size_t len, bool ascii)
{
	const char *ret = trace_seq_buffer_ptr(p);

	trace_seq_putc(p, '\n');
	trace_seq_hex_dump(p, prefix_str, prefix_type,
			   rowsize, groupsize, buf, len, ascii);
	trace_seq_putc(p, 0);
	return ret;
}
EXPORT_SYMBOL(trace_print_hex_dump_seq);

int trace_raw_output_prep(struct trace_iterator *iter,
			  struct trace_event *trace_event)
{
	struct trace_event_call *event;
	struct trace_seq *s = &iter->seq;
	struct trace_seq *p = &iter->tmp_seq;
	struct trace_entry *entry;

	event = container_of(trace_event, struct trace_event_call, event);
	entry = iter->ent;

	if (entry->type != event->event.type) {
		WARN_ON_ONCE(1);
		return TRACE_TYPE_UNHANDLED;
	}

	trace_seq_init(p);
	trace_seq_printf(s, "%s: ", trace_event_name(event));

	return trace_handle_return(s);
}
EXPORT_SYMBOL(trace_raw_output_prep);

void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...)
{
	struct trace_seq *s = &iter->seq;
	va_list ap;

	if (ignore_event(iter))
		return;

	va_start(ap, fmt);
	trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
	va_end(ap);
}
EXPORT_SYMBOL(trace_event_printf);

static __printf(3, 0)
int trace_output_raw(struct trace_iterator *iter, char *name,
		     char *fmt, va_list ap)
{
	struct trace_seq *s = &iter->seq;

Annotation

Implementation Notes