Function report |
Source Code:kernel\trace\ring_buffer.c |
Create Date:2022-07-28 11:54:50 |
| Last Modify:2020-03-17 19:30:04 | Copyright©Brick |
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| Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:g_buffer_oldest_event_ts - get the oldest event timestamp from the buffer*@buffer: The ring buffer*@cpu: The per CPU buffer to read from.
Proto:u64 ring_buffer_oldest_event_ts(struct ring_buffer *buffer, int cpu)
Type:u64
Parameter:
| Type | Parameter | Name |
|---|---|---|
| struct ring_buffer * | buffer | |
| int | cpu |
| 3353 | ret = 0 |
| 3355 | If Not pumask_test_cpu - test for a cpu in a cpumask*@cpu: cpu number (< nr_cpu_ids)*@cpumask: the cpumask pointer* Returns 1 if @cpu is set in @cpumask, else returns 0 Then Return 0 |
| 3358 | cpu_buffer = buffers[cpu] |
| 3359 | raw_spin_lock_irqsave( & serialize readers , flags) |
| 3364 | If write to tail == reader_page Then bpage = reader_page |
| 3366 | Else bpage = rb_set_head_page(cpu_buffer) |
| 3368 | If bpage Then ret = page time stamp |
| 3370 | raw_spin_unlock_irqrestore( & serialize readers , flags) |
| 3372 | Return ret |
| Name | Describe |
|---|---|
| tracing_stats_read |
| Source code conversion tool public plug-in interface | X |
|---|---|
| Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion |