* [PATCH] Documentation: Better document the hardlockup_panic sysctl
@ 2017-12-10 7:48 Scott Wood
2017-12-10 11:35 ` Christoph von Recklinghausen
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Scott Wood @ 2017-12-10 7:48 UTC (permalink / raw)
To: Jonathan Corbet
Cc: linux-kernel, Don Zickus, Christoph von Recklinghausen, Scott Wood
Commit ac1f591249d95372f ("kernel/watchdog.c: add sysctl knob
hardlockup_panic") added the hardlockup_panic sysctl, but did not add it
to Documentation/sysctl/kernel.txt. Add this, and reference it from the
corresponding entry in Documentation/admin-guide/kernel-parameters.txt.
Signed-off-by: Scott Wood <swood@redhat.com>
---
Documentation/admin-guide/kernel-parameters.txt | 3 +++
Documentation/sysctl/kernel.txt | 14 ++++++++++++++
2 files changed, 17 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 6571fbfdb2a1..dfb7c35b5826 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2538,6 +2538,9 @@
This is useful when you use a panic=... timeout and
need the box quickly up again.
+ These settings can be accessed at runtime via
+ the nmi_watchdog and hardlockup_panic sysctls.
+
netpoll.carrier_timeout=
[NET] Specifies amount of time (in seconds) that
netpoll should wait for a carrier. By default netpoll
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 694968c7523c..63663039acb7 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -34,6 +34,7 @@ show up in /proc/sys/kernel:
- hostname
- hotplug
- hardlockup_all_cpu_backtrace
+- hardlockup_panic
- hung_task_panic
- hung_task_check_count
- hung_task_timeout_secs
@@ -313,6 +314,19 @@ will be initiated.
1: on detection capture more debug information.
==============================================================
+hardlockup_panic:
+
+This parameter can be used to control whether the kernel panics
+when a hard lockup is detected.
+
+ 0 - don't panic on hard lockup
+ 1 - panic on hard lockup
+
+See Documentation/lockup-watchdogs.txt for more information. This can
+also be set using the nmi_watchdog kernel parameter.
+
+==============================================================
+
hotplug:
Path for the hotplug policy agent.
--
2.9.5
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] Documentation: Better document the hardlockup_panic sysctl
2017-12-10 7:48 [PATCH] Documentation: Better document the hardlockup_panic sysctl Scott Wood
@ 2017-12-10 11:35 ` Christoph von Recklinghausen
2017-12-11 14:43 ` Don Zickus
2017-12-11 21:56 ` Jonathan Corbet
2 siblings, 0 replies; 4+ messages in thread
From: Christoph von Recklinghausen @ 2017-12-10 11:35 UTC (permalink / raw)
To: Scott Wood; +Cc: Jonathan Corbet, linux-kernel, Don Zickus
Ack
Sent from my iPhone
> On Dec 10, 2017, at 2:48 AM, Scott Wood <swood@redhat.com> wrote:
>
> Commit ac1f591249d95372f ("kernel/watchdog.c: add sysctl knob
> hardlockup_panic") added the hardlockup_panic sysctl, but did not add it
> to Documentation/sysctl/kernel.txt. Add this, and reference it from the
> corresponding entry in Documentation/admin-guide/kernel-parameters.txt.
>
> Signed-off-by: Scott Wood <swood@redhat.com>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 3 +++
> Documentation/sysctl/kernel.txt | 14 ++++++++++++++
> 2 files changed, 17 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 6571fbfdb2a1..dfb7c35b5826 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -2538,6 +2538,9 @@
> This is useful when you use a panic=... timeout and
> need the box quickly up again.
>
> + These settings can be accessed at runtime via
> + the nmi_watchdog and hardlockup_panic sysctls.
> +
> netpoll.carrier_timeout=
> [NET] Specifies amount of time (in seconds) that
> netpoll should wait for a carrier. By default netpoll
> diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
> index 694968c7523c..63663039acb7 100644
> --- a/Documentation/sysctl/kernel.txt
> +++ b/Documentation/sysctl/kernel.txt
> @@ -34,6 +34,7 @@ show up in /proc/sys/kernel:
> - hostname
> - hotplug
> - hardlockup_all_cpu_backtrace
> +- hardlockup_panic
> - hung_task_panic
> - hung_task_check_count
> - hung_task_timeout_secs
> @@ -313,6 +314,19 @@ will be initiated.
> 1: on detection capture more debug information.
> ==============================================================
>
> +hardlockup_panic:
> +
> +This parameter can be used to control whether the kernel panics
> +when a hard lockup is detected.
> +
> + 0 - don't panic on hard lockup
> + 1 - panic on hard lockup
> +
> +See Documentation/lockup-watchdogs.txt for more information. This can
> +also be set using the nmi_watchdog kernel parameter.
> +
> +==============================================================
> +
> hotplug:
>
> Path for the hotplug policy agent.
> --
> 2.9.5
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] Documentation: Better document the hardlockup_panic sysctl
2017-12-10 7:48 [PATCH] Documentation: Better document the hardlockup_panic sysctl Scott Wood
2017-12-10 11:35 ` Christoph von Recklinghausen
@ 2017-12-11 14:43 ` Don Zickus
2017-12-11 21:56 ` Jonathan Corbet
2 siblings, 0 replies; 4+ messages in thread
From: Don Zickus @ 2017-12-11 14:43 UTC (permalink / raw)
To: Scott Wood; +Cc: Jonathan Corbet, linux-kernel, Christoph von Recklinghausen
On Sun, Dec 10, 2017 at 01:48:46AM -0600, Scott Wood wrote:
> Commit ac1f591249d95372f ("kernel/watchdog.c: add sysctl knob
> hardlockup_panic") added the hardlockup_panic sysctl, but did not add it
> to Documentation/sysctl/kernel.txt. Add this, and reference it from the
> corresponding entry in Documentation/admin-guide/kernel-parameters.txt.
Acked-by: Don Zickus <dzickus@redhat.com>
>
> Signed-off-by: Scott Wood <swood@redhat.com>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 3 +++
> Documentation/sysctl/kernel.txt | 14 ++++++++++++++
> 2 files changed, 17 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 6571fbfdb2a1..dfb7c35b5826 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -2538,6 +2538,9 @@
> This is useful when you use a panic=... timeout and
> need the box quickly up again.
>
> + These settings can be accessed at runtime via
> + the nmi_watchdog and hardlockup_panic sysctls.
> +
> netpoll.carrier_timeout=
> [NET] Specifies amount of time (in seconds) that
> netpoll should wait for a carrier. By default netpoll
> diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
> index 694968c7523c..63663039acb7 100644
> --- a/Documentation/sysctl/kernel.txt
> +++ b/Documentation/sysctl/kernel.txt
> @@ -34,6 +34,7 @@ show up in /proc/sys/kernel:
> - hostname
> - hotplug
> - hardlockup_all_cpu_backtrace
> +- hardlockup_panic
> - hung_task_panic
> - hung_task_check_count
> - hung_task_timeout_secs
> @@ -313,6 +314,19 @@ will be initiated.
> 1: on detection capture more debug information.
> ==============================================================
>
> +hardlockup_panic:
> +
> +This parameter can be used to control whether the kernel panics
> +when a hard lockup is detected.
> +
> + 0 - don't panic on hard lockup
> + 1 - panic on hard lockup
> +
> +See Documentation/lockup-watchdogs.txt for more information. This can
> +also be set using the nmi_watchdog kernel parameter.
> +
> +==============================================================
> +
> hotplug:
>
> Path for the hotplug policy agent.
> --
> 2.9.5
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] Documentation: Better document the hardlockup_panic sysctl
2017-12-10 7:48 [PATCH] Documentation: Better document the hardlockup_panic sysctl Scott Wood
2017-12-10 11:35 ` Christoph von Recklinghausen
2017-12-11 14:43 ` Don Zickus
@ 2017-12-11 21:56 ` Jonathan Corbet
2 siblings, 0 replies; 4+ messages in thread
From: Jonathan Corbet @ 2017-12-11 21:56 UTC (permalink / raw)
To: Scott Wood; +Cc: linux-kernel, Don Zickus, Christoph von Recklinghausen
On Sun, 10 Dec 2017 01:48:46 -0600
Scott Wood <swood@redhat.com> wrote:
> Commit ac1f591249d95372f ("kernel/watchdog.c: add sysctl knob
> hardlockup_panic") added the hardlockup_panic sysctl, but did not add it
> to Documentation/sysctl/kernel.txt. Add this, and reference it from the
> corresponding entry in Documentation/admin-guide/kernel-parameters.txt.
Applied to the docs tree, thanks.
jon
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-12-11 21:56 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-12-10 7:48 [PATCH] Documentation: Better document the hardlockup_panic sysctl Scott Wood
2017-12-10 11:35 ` Christoph von Recklinghausen
2017-12-11 14:43 ` Don Zickus
2017-12-11 21:56 ` Jonathan Corbet
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.