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Date: Wed, 24 Feb 2021 09:54:10 +0800
From: Baoquan He <bhe@...hat.com>
To: Saeed Mirzamohammadi <saeed.mirzamohammadi@...cle.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: john.p.donnelly@...cle.com, Dave Young <dyoung@...hat.com>,
Vivek Goyal <vgoyal@...hat.com>,
Jonathan Corbet <corbet@....net>,
"Paul E. McKenney" <paulmck@...nel.org>,
Randy Dunlap <rdunlap@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
Mike Kravetz <mike.kravetz@...cle.com>,
"Guilherme G. Piccoli" <gpiccoli@...onical.com>,
Kees Cook <keescook@...omium.org>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
"Steven Rostedt (VMware)" <rostedt@...dmis.org>,
Frederic Weisbecker <frederic@...nel.org>,
YiFei Zhu <yifeifz2@...inois.edu>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Mike Rapoport <rppt@...nel.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Sami Tolvanen <samitolvanen@...gle.com>,
Christian Brauner <christian.brauner@...ntu.com>,
Stephen Boyd <sboyd@...nel.org>,
Andrey Konovalov <andreyknvl@...gle.com>,
kexec@...ts.infradead.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/1] kernel/crash_core: Add crashkernel=auto for
vmcore creation
On 02/11/21 at 10:08am, 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@...cle.com>
> Signed-off-by: John Donnelly <john.p.donnelly@...cle.com>
> Tested-by: John Donnelly <john.p.donnelly@...cle.com>
> ---
> Documentation/admin-guide/kdump/kdump.rst | 3 ++-
> .../admin-guide/kernel-parameters.txt | 6 +++++
> arch/Kconfig | 24 +++++++++++++++++++
> kernel/crash_core.c | 7 ++++++
> 4 files changed, 39 insertions(+), 1 deletion(-)
Acked-by: Baoquan He <bhe@...hat.com>
>
> diff --git a/Documentation/admin-guide/kdump/kdump.rst b/Documentation/admin-guide/kdump/kdump.rst
> index 2da65fef2a1c..e55cdc404c6b 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 7d4e523646c3..aa2099465458 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -736,6 +736,12 @@
> 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 af14a567b493..f87c88ffa2f8 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
>
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