Re: [PATCH 1/3 v2] Docs: admin/kernel-parameters: edit a few boot options

[Randy Dunlap]

On 4/1/22 09:03, Steven Rostedt wrote:
> On Thu, 31 Mar 2022 20:09:25 -0700
> Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:
> 
>> @@ -5908,6 +5910,8 @@
>>  	trace_buf_size=nn[KMG]
>>  			[FTRACE] will set tracing buffer size on each cpu.
>>  
>> +	trace_clock=	[FTRACE] See Documentation/trace/ftrace.rst
> 
> 	trace_clock=	[FTRACE] Set the clock used for tracing events
> 			at boot up.
> 			local - Use the per CPU time stamp counter
> 				(converted into nanoseconds). Fast, but
> 				depending on the architecture, may not be
> 				in sync between CPUs.
> 			global - Event time stamps are synchronize across
> 				CPUs. May be slower than the local clock,
> 				but better for some race conditions.
> 			counter - Simple counting of events (1, 2, ..)
> 				note, some counts may be skipped due to the
> 				infrastructure grabbing the clock more than
> 				once per event.
> 			uptime - Use jiffies as the time stamp.
> 			perf - Use the same clock that perf uses.
> 			mono - Use ktime_get_mono_fast_ns() for time stamps.
> 			mono_raw - Use ktime_get_raw_fast_ns() for time
> 				stamps.
> 			boot - Use ktime_get_boot_fast_ns() for time stamps.
> 			Architectures may add more clocks. See
> 			Documentation/trace/ftrace.rst for more details.
> 

Will do. Thanks.

> 
> 
>> +
>>  	trace_event=[event-list]
>>  			[FTRACE] Set and start specified trace events in order
>>  			to facilitate early boot debugging. The event-list is a

-- 
~Randy