Function report |
Source Code:kernel\trace\trace_hwlat.c |
Create Date:2022-07-28 12:10:41 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:trace_hwlat_sample
Proto:static void trace_hwlat_sample(struct hwlat_sample *sample)
Type:void
Parameter:
Type | Parameter | Name |
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struct hwlat_sample * | sample |
105 | tr = hwlat_trace |
106 | call = event_hwlat |
113 | pc = We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users* that think a non-zero value indicates we cannot preempt. |
114 | local_save_flags(flags) |
116 | event = trace_buffer_lock_reserve(buffer, TRACE_HWLAT, size of entry , flags, pc) |
118 | If Not event Then Return |
120 | entry = g_buffer_event_data - return the data of the event*@event: the event to get the data from |
121 | seqnum = unique sequence |
128 | If Not call_filter_check_discard(call, entry, buffer, event) Then Similar to trace_buffer_unlock_commit_regs() but do not dump stack. |
Name | Describe |
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get_sample | get_sample - sample the CPU TSC and look for likely hardware latencies* Used to repeatedly capture the CPU TSC (or similar), looking for potential* hardware-induced latency. Called with interrupts disabled and with* hwlat_data.lock held. |
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