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 13:10:34
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：ftrace_dump

函数原型：void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)

返回类型：void

参数：

类型参数名称
enum ftrace_dump_modeoops_dump_mode
9060  tr等于The global_trace is the descriptor that holds the top-level tracing* buffers for the live tracing.
9063  cnt等于0
9066  如果atomic_inc_return( & dump_running)不等于1则
9067  atomic_dec( & dump_running)
9068  返回
9079  racing_off - turn off tracing buffers* This function stops the tracing buffers from recording data.* It does not disable any overhead the tracers themselves may* be causing. This function simply causes all recording to* the ring buffers to fail.
9081  local_irq_save(flags)
9082  printk_nmi_direct_enter()
9085  trace_init_global_iter( & iter)
9087  for_each_tracing_cpu(cpu)
9088  atomic_inc( & disabled)
9091  old_userobj等于trace_flags按位与TRACE_ITER_SYM_USEROBJ
9094  trace_flags与等于TRACE_ITER_SYM_USEROBJ的反
9097  当:oops_dump_mode恒等于DUMP_ALL
9098  cpu_file等于RING_BUFFER_ALL_CPUS
9099  退出
9100  当:oops_dump_mode恒等于DUMP_ORIG
9101  cpu_file等于These macros fold the SMP functionality into a single CPU system()
9102  退出
9103  当:oops_dump_mode恒等于DUMP_NONE
9104  转到:out_enable
9105  默认
9106  printk - print a kernel message*@fmt: format string* This is printk(). It can be called from any context. We want it to work.* We try to grab the console_lock. If we succeed, it's easy - we log the* output and call the console drivers
9107  cpu_file等于RING_BUFFER_ALL_CPUS
9110  printk - print a kernel message*@fmt: format string* This is printk(). It can be called from any context. We want it to work.* We try to grab the console_lock. If we succeed, it's easy - we log the* output and call the console drivers
9113  如果ftrace_is_dead()则
9114  printk - print a kernel message*@fmt: format string* This is printk(). It can be called from any context. We want it to work.* We try to grab the console_lock. If we succeed, it's easy - we log the* output and call the console drivers
9115  printk - print a kernel message*@fmt: format string* This is printk(). It can be called from any context. We want it to work.* We try to grab the console_lock. If we succeed, it's easy - we log the* output and call the console drivers
9125  当非trace_empty( & iter)循环
9127  如果非cnt则printk - print a kernel message*@fmt: format string* This is printk(). It can be called from any context. We want it to work.* We try to grab the console_lock. If we succeed, it's easy - we log the* output and call the console drivers
9130  cnt自加
9132  Reset the state of the trace_iterator so that it can read consumed data.* Normally, the trace_iterator is used for reading the data when it is not* consumed, and must retain state.
9133  iter_flags或等于TRACE_FILE_LAT_FMT
9135  如果(Find the next real entry, and increment the iterator to the next entry != NULL)则
9138  ret等于Called with trace_event_read_lock() held.
9139  如果ret不等于TRACE_TYPE_NO_CONSUME则trace_consume( & iter)
9142  h_nmi_watchdog - restart NMI watchdog timeout.* If the architecture supports the NMI watchdog, touch_nmi_watchdog()* may be used to reset the timeout - for code which intentionally* disables interrupts for a long time. This call is stateless.
9144  trace_printk_seq( & The below is zeroed out in pipe_read )
9147  如果非cnt则printk - print a kernel message*@fmt: format string* This is printk(). It can be called from any context. We want it to work.* We try to grab the console_lock. If we succeed, it's easy - we log the* output and call the console drivers
9149  否则printk - print a kernel message*@fmt: format string* This is printk(). It can be called from any context. We want it to work.* We try to grab the console_lock. If we succeed, it's easy - we log the* output and call the console drivers
9152  out_enable :
9153  trace_flags或等于old_userobj
9155  for_each_tracing_cpu(cpu)
9156  atomic_dec( & disabled)
9158  atomic_dec( & dump_running)
9159  printk_nmi_direct_exit()
9160  local_irq_restore(flags)
调用者
名称描述
trace_panic_handler
trace_die_handler