2015-08-22 06:53:33

by Yaowei Bai

Subject: [PATCH] Documentation: add 'crashkernel=auto' entry into kernel-parameters.txt

There is no 'crashkernel=auto' entry in kernel-parameters.txt, borrow it
from kexec-kdump-howto.txt file in the kexec-tools-2.0.0 package.

Signed-off-by: Yaowei Bai <[email protected]>
---
Documentation/kernel-parameters.txt | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 1d6f045..4da77fa 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -797,6 +797,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
It will be ignored when crashkernel=X,high is not used
or memory reserved is below 4G.

+ crashkernel=auto
+ This specification allows the kernel to decide how much
+ meory to reserve for the purposes of kdump. It will make
+ this determination based on the amount of memory you have
+ in your system, and scale the allocation accordingly.
+ Note that if you have less than 4Gb of memory in your system,
+ this specification will opt to not allocate any memory for
+ the purposes of kdump.
+
cs89x0_dma= [HW,NET]
Format: <dma>

--
1.9.1

2015-08-22 17:57:12

by Randy Dunlap

Subject: Re: [PATCH] Documentation: add 'crashkernel=auto' entry into kernel-parameters.txt

On 08/21/15 23:51, Yaowei Bai wrote:
> There is no 'crashkernel=auto' entry in kernel-parameters.txt, borrow it
> from kexec-kdump-howto.txt file in the kexec-tools-2.0.0 package.
>
> Signed-off-by: Yaowei Bai <[email protected]>
> ---
> Documentation/kernel-parameters.txt | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 1d6f045..4da77fa 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -797,6 +797,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> It will be ignored when crashkernel=X,high is not used
> or memory reserved is below 4G.
>
> + crashkernel=auto
> + This specification allows the kernel to decide how much
> + meory to reserve for the purposes of kdump. It will make

memory

> + this determination based on the amount of memory you have
> + in your system, and scale the allocation accordingly.
> + Note that if you have less than 4Gb of memory in your system,
> + this specification will opt to not allocate any memory for
> + the purposes of kdump.
> +
> cs89x0_dma= [HW,NET]
> Format: <dma>
>
>


--
~Randy