Hi Saeed,
On 02/03/21 at 04:43pm, Saeed Mirzamohammadi wrote:
> This adds crashkernel=auto feature to configure reserved memory for
> vmcore creation. CONFIG_CRASH_AUTO_STR is defined to be set for
> different kernel distributions and different archs based on their
> needs.
>
> Signed-off-by: Saeed Mirzamohammadi <saeed.mirzamohammadi at oracle.com>
> Signed-off-by: John Donnelly <john.p.donnelly at oracle.com>
> Tested-by: John Donnelly <john.p.donnelly at oracle.com>
> ---
> Documentation/admin-guide/kdump/kdump.rst | 5 +++++
> arch/Kconfig | 24 +++++++++++++++++++++++
> kernel/crash_core.c | 7 +++++++
> 3 files changed, 36 insertions(+)
>
> diff --git a/Documentation/admin-guide/kdump/kdump.rst b/Documentation/admin-guide/kdump/kdump.rst
> index 75a9dd98e76e..f95a2af64f59 100644
> --- a/Documentation/admin-guide/kdump/kdump.rst
> +++ b/Documentation/admin-guide/kdump/kdump.rst
> @@ -285,7 +285,12 @@ This would mean:
> 2) if the RAM size is between 512M and 2G (exclusive), then reserve 64M
> 3) if the RAM size is larger than 2G, then reserve 128M
>
> +Or you can use crashkernel=auto if you have enough memory. The threshold
> +is 1G on x86_64 and arm64. If your system memory is less than the threshold,
> +crashkernel=auto will not reserve memory. The size changes according to
> +the system memory size like below:
>
> + x86_64/arm64: 1G-64G:128M,64G-1T:256M,1T-:512M
This part should be updated since you do not make the default value arch
dependent.
The format of the auto str is documented well in kernel-parameters.txt
below part:
crashkernel=range1:size1[,range2:size2,...][@offset]
The crashkernel=auto should be also documented in kernel-parameters.txt
and do not need to explain the threshold etc again, just refer to the
"crashkernel=range1:size1[,range2:size2,...][@offset]" format would be
fine.
>
> Boot into System Kernel
> =======================
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 56b6ccc0e32d..a772eb397d73 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -14,6 +14,30 @@ menu "General architecture-dependent options"
> config CRASH_CORE
> bool
>
> +if CRASH_CORE
> +
> +config CRASH_AUTO_STR
> + string "Memory reserved for crash kernel"
> + depends on CRASH_CORE
> + default "1G-64G:128M,64G-1T:256M,1T-:512M"
> + help
> + This configures the reserved memory dependent
> + on the value of System RAM. The syntax is:
> + crashkernel=<range1>:<size1>[,<range2>:<size2>,...][@offset]
> + range=start-[end]
> +
> + For example:
> + crashkernel=512M-2G:64M,2G-:128M
> +
> + This would mean:
> +
> + 1) if the RAM is smaller than 512M, then don't reserve anything
> + (this is the "rescue" case)
> + 2) if the RAM size is between 512M and 2G (exclusive), then reserve 64M
> + 3) if the RAM size is larger than 2G, then reserve 128M
> +
> +endif # CRASH_CORE
> +
> config KEXEC_CORE
> select CRASH_CORE
> bool
> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> index 106e4500fd53..ab0a2b4b1ffa 100644
> --- a/kernel/crash_core.c
> +++ b/kernel/crash_core.c
> @@ -7,6 +7,7 @@
> #include <linux/crash_core.h>
> #include <linux/utsname.h>
> #include <linux/vmalloc.h>
> +#include <linux/kexec.h>
>
> #include <asm/page.h>
> #include <asm/sections.h>
> @@ -250,6 +251,12 @@ static int __init __parse_crashkernel(char *cmdline,
> if (suffix)
> return parse_crashkernel_suffix(ck_cmdline, crash_size,
> suffix);
> +#ifdef CONFIG_CRASH_AUTO_STR
> + if (strncmp(ck_cmdline, "auto", 4) == 0) {
> + ck_cmdline = CONFIG_CRASH_AUTO_STR;
> + pr_info("Using crashkernel=auto, the size chosen is a best effort estimation.\n");
> + }
> +#endif
> /*
> * if the commandline contains a ':', then that's the extended
> * syntax -- if not, it must be the classic syntax
> --
> 2.27.0
>
Thanks
Dave