trace_event_buffer_lock

Name:trace_event_buffer_lock_reserve

Proto:struct ring_buffer_event *trace_event_buffer_lock_reserve(struct ring_buffer **current_rb, struct trace_event_file *trace_file, int type, unsigned long len, unsigned long flags, int pc)

Type:struct ring_buffer_event

Parameter:

Type	Parameter	Name
struct ring_buffer **	current_rb
struct trace_event_file *	trace_file
int	type
unsigned long	len
unsigned long	flags
int	pc

2577

current_rb = buffer

2579

If Not ring_buffer_time_stamp_abs( * current_rb) && * 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 & (EVENT_FILE_FL_SOFT_DISABLED | EVENT_FILE_FL_FILTERED) && (entry = Operations with implied preemption/interrupt protection. These* operations can be used without worrying about preemption or interrupt.(trace_buffered_event)) Then

2583

val = this_cpu_inc_return(trace_buffered_event_cnt)

2584

If val == 1 Then

2585

trace_event_setup(entry, type, flags, pc)

2586

array[0] = len

2587

Return entry

2589

this_cpu_dec(trace_buffered_event_cnt)

2592

entry = __trace_buffer_lock_reserve( * current_rb, type, len, flags, pc)

2600

If Not entry && * 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 & EVENT_FILE_FL_TRIGGER_COND Then

2601

current_rb = temp_buffer

2602

entry = __trace_buffer_lock_reserve( * current_rb, type, len, flags, pc)

2605

Return entry

**Caller**
Name	Describe
trace_event_buffer_reserve
__kprobe_trace_func	Kprobe handler
__kretprobe_trace_func	Kretprobe handler
__uprobe_trace_func

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