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

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Date:   Fri, 1 Apr 2022 12:03:05 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        linux-s390@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        sparclinux@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>,
        linux-ia64@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Pavel Machek <pavel@....cz>, Len Brown <lenb@...nel.org>,
        linux-pm@...r.kernel.org, linux-acpi@...r.kernel.org,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/3 v2] Docs: admin/kernel-parameters: edit a few boot
 options

On Thu, 31 Mar 2022 20:09:25 -0700
Randy Dunlap <rdunlap@...radead.org> 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.

-- Steve


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