函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace.c Create Date:2022-07-27 13:05:17
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：__trace_array_vprintk

函数原型：static int __trace_array_vprintk(struct ring_buffer *buffer, unsigned long ip, const char *fmt, va_list args)

返回类型：int

参数：

类型参数名称
struct ring_buffer *buffer
unsigned longip
const char *fmt
va_listargs
3253  call等于event_print
3255  len等于0
3260  如果Kill all tracing for good (never come back).* It is initialized to 1 but will turn to zero if the initialization* of the tracer is successful. But that is the only place that sets* this back to zero.或We need to change this state when a selftest is running.* A selftest will lurk into the ring-buffer to count the* entries inserted during the selftest although some concurrent* insertions into the ring-buffer such as trace_printk could occurred则返回:0
3264  pause_graph_tracing()
3266  pc等于抢占计数值
3267  preempt_disable_notrace()
3270  tbuffer等于Thise allows for lockless recording. If we're nested too deeply, then* this returns NULL.
3271  如果非tbuffer则
3272  len等于0
3273  转到:out_nobuffer
3276  len等于格式化输出字符串
3278  local_save_flags(flags)
3279  size等于entry的长度加len加1
3280  event等于__trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, flags, pc)
3282  如果非event则转到:out
3284  entry等于g_buffer_event_data - return the data of the event*@event: the event to get the data from
3285  ip等于ip
3287  内存复制( & buf, tbuffer, len + 1)
3288  如果非call_filter_check_discard(call, entry, buffer, event)则
3289  __buffer_unlock_commit(buffer, event)
3290  ftrace_trace_stack( & The global_trace is the descriptor that holds the top-level tracing* buffers for the live tracing., buffer, flags, 6, pc, NULL)
3293  out :
3294  put_trace_buf()
3296  out_nobuffer :
3297  preempt_enable_notrace()
3298  unpause_graph_tracing()
3300  返回:len
调用者
名称描述
trace_array_vprintk
trace_array_printk_buf