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Message-ID: <CAJZ5v0gZvd_Uw02_K7fWGYFtTncSTxdeoR6z=PQ5e0DM255k8A@mail.gmail.com>
Date: Tue, 5 Apr 2022 16:12:58 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Randy Dunlap <rdunlap@...radead.org>
Cc: Linux Kernel Mailing List <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, Steven Rostedt <rostedt@...dmis.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 <linux-pm@...r.kernel.org>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Johannes Weiner <hannes@...xchg.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Jonathan Corbet <corbet@....net>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 1/3 v3] Docs: admin/kernel-parameters: edit a few boot options
On Sun, Apr 3, 2022 at 7:48 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> Clean up some of admin-guide/kernel-parameters.txt:
>
> a. "smt" should be "smt=" (S390)
> b. (dropped)
> c. Sparc supports the vdso= boot option
> d. make the tp_printk options (2) formatting similar to other options
> by adding spacing
> e. add "trace_clock=" with a reference to Documentation/trace/ftrace.rst
> f. use [IA-64] as documented instead of [ia64]
> g. fix formatting and text for test_suspend=
> h. fix formatting for swapaccount=
> i. fix formatting and grammar for video.brightness_switch_enabled=
>
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Heiko Carstens <hca@...ux.ibm.com>
> Cc: Vasily Gorbik <gor@...ux.ibm.com>
> Cc: Alexander Gordeev <agordeev@...ux.ibm.com>
> Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>
> Cc: Sven Schnelle <svens@...ux.ibm.com>
> Cc: linux-s390@...r.kernel.org
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: sparclinux@...r.kernel.org
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: linux-ia64@...r.kernel.org
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Len Brown <lenb@...nel.org>
> Cc: linux-pm@...r.kernel.org
> Cc: linux-acpi@...r.kernel.org
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: linux-doc@...r.kernel.org
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
for the test_suspend and ACPI video pieces.
> ---
> v3: add trace_clock= specifics (Steven)
> v2: drop "smt-enabled" for arch/powerpc/ (Michael)
>
> Documentation/admin-guide/kernel-parameters.txt | 47 ++++++++++----
> 1 file changed, 36 insertions(+), 11 deletions(-)
>
> --- linux-next-20220331.orig/Documentation/admin-guide/kernel-parameters.txt
> +++ linux-next-20220331/Documentation/admin-guide/kernel-parameters.txt
> @@ -2814,7 +2814,7 @@
> different yeeloong laptops.
> Example: machtype=lemote-yeeloong-2f-7inch
>
> - max_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory greater
> + max_addr=nn[KMG] [KNL,BOOT,IA-64] All physical memory greater
> than or equal to this physical address is ignored.
>
> maxcpus= [SMP] Maximum number of processors that an SMP kernel
> @@ -3057,7 +3057,7 @@
>
> mga= [HW,DRM]
>
> - min_addr=nn[KMG] [KNL,BOOT,ia64] All physical memory below this
> + min_addr=nn[KMG] [KNL,BOOT,IA-64] All physical memory below this
> physical address is ignored.
>
> mini2440= [ARM,HW,KNL]
> @@ -5388,7 +5388,7 @@
> 1: Fast pin select (default)
> 2: ATC IRMode
>
> - smt [KNL,S390] Set the maximum number of threads (logical
> + smt= [KNL,S390] Set the maximum number of threads (logical
> CPUs) to use per physical CPU on systems capable of
> symmetric multithreading (SMT). Will be capped to the
> actual hardware limit.
> @@ -5774,8 +5774,9 @@
> This parameter controls use of the Protected
> Execution Facility on pSeries.
>
> - swapaccount=[0|1]
> - [KNL] Enable accounting of swap in memory resource
> + swapaccount= [KNL]
> + Format: [0|1]
> + Enable accounting of swap in memory resource
> controller if no parameter or 1 is given or disable
> it if 0 is given (See Documentation/admin-guide/cgroup-v1/memory.rst)
>
> @@ -5821,7 +5822,8 @@
>
> tdfx= [HW,DRM]
>
> - test_suspend= [SUSPEND][,N]
> + test_suspend= [SUSPEND]
> + Format: { "mem" | "standby" | "freeze" }[,N]
> Specify "mem" (for Suspend-to-RAM) or "standby" (for
> standby suspend) or "freeze" (for suspend type freeze)
> as the system sleep state during system startup with
> @@ -5908,6 +5910,28 @@
> trace_buf_size=nn[KMG]
> [FTRACE] will set tracing buffer size on each cpu.
>
> + 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.
> +
> trace_event=[event-list]
> [FTRACE] Set and start specified trace events in order
> to facilitate early boot debugging. The event-list is a
> @@ -5930,7 +5954,7 @@
> See also Documentation/trace/ftrace.rst "trace options"
> section.
>
> - tp_printk[FTRACE]
> + tp_printk [FTRACE]
> Have the tracepoints sent to printk as well as the
> tracing ring buffer. This is useful for early boot up
> where the system hangs or reboots and does not give the
> @@ -5952,7 +5976,7 @@
> frequency tracepoints such as irq or sched, can cause
> the system to live lock.
>
> - tp_printk_stop_on_boot[FTRACE]
> + tp_printk_stop_on_boot [FTRACE]
> When tp_printk (above) is set, it can cause a lot of noise
> on the console. It may be useful to only include the
> printing of events during boot up, as user space may
> @@ -6301,7 +6325,7 @@
> HIGHMEM regardless of setting
> of CONFIG_HIGHPTE.
>
> - vdso= [X86,SH]
> + vdso= [X86,SH,SPARC]
> On X86_32, this is an alias for vdso32=. Otherwise:
>
> vdso=1: enable VDSO (the default)
> @@ -6327,11 +6351,12 @@
> video= [FB] Frame buffer configuration
> See Documentation/fb/modedb.rst.
>
> - video.brightness_switch_enabled= [0,1]
> + video.brightness_switch_enabled= [ACPI]
> + Format: [0|1]
> If set to 1, on receiving an ACPI notify event
> generated by hotkey, video driver will adjust brightness
> level and then send out the event to user space through
> - the allocated input device; If set to 0, video driver
> + the allocated input device. If set to 0, video driver
> will only send out the event without touching backlight
> brightness level.
> default: 1
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