Re: [PATCH v4 1/1] kernel/crash_core: Add crashkernel=auto for vmcore creation

[john . p . donnelly]

On 2/25/21 6:38 PM, Dave Young wrote:
> On 02/23/21 at 09:41am, 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@xxxxxxxxxx>
> > Signed-off-by: John Donnelly <john.p.donnelly@xxxxxxxxxx>
> > Tested-by: John Donnelly <john.p.donnelly@xxxxxxxxxx>
> > ---
> >   Documentation/admin-guide/kdump/kdump.rst     |  3 ++-
> >   .../admin-guide/kernel-parameters.txt         |  6 ++++++
> >   arch/Kconfig                                  | 20 +++++++++++++++++++
> >   kernel/crash_core.c                           |  7 +++++++
> >   4 files changed, 35 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/admin-guide/kdump/kdump.rst b/Documentation/admin-guide/kdump/kdump.rst
> > index 75a9dd98e76e..ae030111e22a 100644
> > --- a/Documentation/admin-guide/kdump/kdump.rst
> > +++ b/Documentation/admin-guide/kdump/kdump.rst
> > @@ -285,7 +285,8 @@ 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 to choose the crash kernel memory size
> > +based on the recommended configuration set for each arch.
> >   
> >   Boot into System Kernel
> >   =======================
> > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> > index 9e3cdb271d06..a5deda5c85fe 100644
> > --- a/Documentation/admin-guide/kernel-parameters.txt
> > +++ b/Documentation/admin-guide/kernel-parameters.txt
> > @@ -747,6 +747,12 @@
> >   			a memory unit (amount[KMG]). See also
> >   			Documentation/admin-guide/kdump/kdump.rst for an example.
> >   
> > +	crashkernel=auto
> > +			[KNL] This parameter will set the reserved memory for
> > +			the crash kernel based on the value of the CRASH_AUTO_STR
> > +			that is the best effort estimation for each arch. See also
> > +			arch/Kconfig for further details.
> > +
> >   	crashkernel=size[KMG],high
> >   			[KNL, X86-64] range could be above 4G. Allow kernel
> >   			to allocate physical memory region from top, so could
> > diff --git a/arch/Kconfig b/arch/Kconfig
> > index 24862d15f3a3..23d047548772 100644
> > --- a/arch/Kconfig
> > +++ b/arch/Kconfig
> > @@ -14,6 +14,26 @@ menu "General architecture-dependent options"
> >   config CRASH_CORE
> >   	bool
> >   
> > +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
> > +
> >   config KEXEC_CORE
> >   	select CRASH_CORE
> >   	bool
> > diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> > index 825284baaf46..90f9e4bb6704 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
>
>
> Acked-by: Dave Young <dyoung@xxxxxxxxxx>
>
> Thanks
> Dave
Hi,

  Thank you.

  When can  we expect this to be applied in a future build ?