函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\trace_events.c Create Date:2022-07-27 13:25:48
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：__ftrace_event_enable_disable

函数原型：static int __ftrace_event_enable_disable(struct trace_event_file *file, int enable, int soft_disable)

返回类型：int

参数：

类型参数名称
struct trace_event_file *file
intenable
intsoft_disable
365  call等于event_call
366  tr等于tr
367  file_flags等于* 32 bit flags: * bit 0: enabled * bit 1: enabled cmd record * bit 2: enable/disable with the soft disable bit * bit 3: soft disabled * bit 4: trigger enabled * Note: The bits must be set atomically to prevent races * from other writers. Reads of flags do
368  ret等于0
372  当:enable恒等于0
386  如果soft_disable则
387  如果atomic_dec_return( & soft-mode reference counter )大于0则退出
389  disable等于* 32 bit flags: * bit 0: enabled * bit 1: enabled cmd record * bit 2: enable/disable with the soft disable bit * bit 3: soft disabled * bit 4: trigger enabled * Note: The bits must be set atomically to prevent races * from other writers. Reads of flags do 按位与EVENT_FILE_FL_SOFT_DISABLED
390  lear_bit - Clears a bit in memory*@nr: Bit to clear*@addr: Address to start counting from* This is a relaxed atomic operation (no implied memory barriers).
391  否则disable等于非* 32 bit flags: * bit 0: enabled * bit 1: enabled cmd record * bit 2: enable/disable with the soft disable bit * bit 3: soft disabled * bit 4: trigger enabled * Note: The bits must be set atomically to prevent races * from other writers. Reads of flags do 按位与EVENT_FILE_FL_SOFT_MODE的值
394  如果disable且* 32 bit flags: * bit 0: enabled * bit 1: enabled cmd record * bit 2: enable/disable with the soft disable bit * bit 3: soft disabled * bit 4: trigger enabled * Note: The bits must be set atomically to prevent races * from other writers. Reads of flags do 按位与EVENT_FILE_FL_ENABLED则
395  lear_bit - Clears a bit in memory*@nr: Bit to clear*@addr: Address to start counting from* This is a relaxed atomic operation (no implied memory barriers).
396  如果* 32 bit flags: * bit 0: enabled * bit 1: enabled cmd record * bit 2: enable/disable with the soft disable bit * bit 3: soft disabled * bit 4: trigger enabled * Note: The bits must be set atomically to prevent races * from other writers. Reads of flags do 按位与EVENT_FILE_FL_RECORDED_CMD则
401  如果* 32 bit flags: * bit 0: enabled * bit 1: enabled cmd record * bit 2: enable/disable with the soft disable bit * bit 3: soft disabled * bit 4: trigger enabled * Note: The bits must be set atomically to prevent races * from other writers. Reads of flags do 按位与EVENT_FILE_FL_RECORDED_TGID则
406  reg(call, TRACE_REG_UNREGISTER, file)
409  如果* 32 bit flags: * bit 0: enabled * bit 1: enabled cmd record * bit 2: enable/disable with the soft disable bit * bit 3: soft disabled * bit 4: trigger enabled * Note: The bits must be set atomically to prevent races * from other writers. Reads of flags do 按位与EVENT_FILE_FL_SOFT_MODE则设置内存位
411  否则lear_bit - Clears a bit in memory*@nr: Bit to clear*@addr: Address to start counting from* This is a relaxed atomic operation (no implied memory barriers).
413  退出
414  当:enable恒等于1
423  如果非soft_disable则lear_bit - Clears a bit in memory*@nr: Bit to clear*@addr: Address to start counting from* This is a relaxed atomic operation (no implied memory barriers).
425  否则
426  如果atomic_inc_return( & soft-mode reference counter )大于1则退出
428  设置内存位
431  如果非* 32 bit flags: * bit 0: enabled * bit 1: enabled cmd record * bit 2: enable/disable with the soft disable bit * bit 3: soft disabled * bit 4: trigger enabled * Note: The bits must be set atomically to prevent races * from other writers. Reads of flags do 按位与EVENT_FILE_FL_ENABLED的值则
432  bool cmd = TSC's on different sockets may be reset asynchronously.* This may cause the TSC ADJUST value on socket 0 to be NOT 0., tgid = false
435  如果soft_disable则设置内存位
438  如果trace_flags按位与TRACE_ITER_RECORD_CMD则
439  cmd = true
440  tracing_start_cmdline_record()
441  设置内存位
444  如果trace_flags按位与TRACE_ITER_RECORD_TGID则
445  tgid = true
446  tracing_start_tgid_record()
447  设置内存位
450  ret等于reg(call, TRACE_REG_REGISTER, file)
451  如果ret则
452  如果cmd则tracing_stop_cmdline_record()
454  如果tgid则tracing_stop_tgid_record()
456  打印信息("event trace: Could not enable event %s\n", trace_event_name(call))
458  退出
460  设置内存位
463  设置内存位
465  退出
469  如果file_flags按位与EVENT_FILE_FL_SOFT_DISABLED的值不等于* 32 bit flags: * bit 0: enabled * bit 1: enabled cmd record * bit 2: enable/disable with the soft disable bit * bit 3: soft disabled * bit 4: trigger enabled * Note: The bits must be set atomically to prevent races * from other writers. Reads of flags do 按位与EVENT_FILE_FL_SOFT_DISABLED的值则
471  如果* 32 bit flags: * bit 0: enabled * bit 1: enabled cmd record * bit 2: enable/disable with the soft disable bit * bit 3: soft disabled * bit 4: trigger enabled * Note: The bits must be set atomically to prevent races * from other writers. Reads of flags do 按位与EVENT_FILE_FL_SOFT_DISABLED则race_buffered_event_enable - enable buffering events* When events are being filtered, it is quicker to use a temporary* buffer to write the event data into if there's a likely chance* that it will not be committed
473  否则race_buffered_event_disable - disable buffering events* When a filter is removed, it is faster to not use the buffered* events, and to commit directly into the ring buffer. Free up* the temp buffers when there are no more users. This requires
477  返回:ret
调用者
名称描述
trace_event_enable_disable
ftrace_event_enable_disable