* [PATCH] efi: Disable mirror feature during crashkernel
@ 2024-01-09 4:15 Wupeng Ma
2024-01-09 6:05 ` Mike Rapoport
0 siblings, 1 reply; 2+ messages in thread
From: Wupeng Ma @ 2024-01-09 4:15 UTC (permalink / raw)
To: akpm, rppt; +Cc: linux-mm, mawupeng1, linux-kernel
From: Ma Wupeng <mawupeng1@huawei.com>
If system have no mirrored memory or use crashkernel.high while
kernelcore=mirror is enabled in cmdline, during crashkernel,
there will be limited mirrored memory and this usually lead to
OOM.
To solve this problem, disable mirror feature during crashkernel.
Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
---
mm/mm_init.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 077bfe393b5e..513bad672708 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -26,6 +26,7 @@
#include <linux/pgtable.h>
#include <linux/swap.h>
#include <linux/cma.h>
+#include <linux/crash_dump.h>
#include "internal.h"
#include "slab.h"
#include "shuffle.h"
@@ -381,6 +382,11 @@ static void __init find_zone_movable_pfns_for_nodes(void)
goto out;
}
+ if (is_kdump_kernel()) {
+ pr_warn("The system is under kdump, ignore kernelcore=mirror.\n");
+ goto out;
+ }
+
for_each_mem_region(r) {
if (memblock_is_mirror(r))
continue;
--
2.25.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] efi: Disable mirror feature during crashkernel
2024-01-09 4:15 [PATCH] efi: Disable mirror feature during crashkernel Wupeng Ma
@ 2024-01-09 6:05 ` Mike Rapoport
0 siblings, 0 replies; 2+ messages in thread
From: Mike Rapoport @ 2024-01-09 6:05 UTC (permalink / raw)
To: Wupeng Ma; +Cc: akpm, linux-mm, linux-kernel
On Tue, Jan 09, 2024 at 12:15:36PM +0800, Wupeng Ma wrote:
> From: Ma Wupeng <mawupeng1@huawei.com>
>
> If system have no mirrored memory or use crashkernel.high while
> kernelcore=mirror is enabled in cmdline, during crashkernel,
> there will be limited mirrored memory and this usually lead to
> OOM.
>
> To solve this problem, disable mirror feature during crashkernel.
>
> Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
> ---
> mm/mm_init.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/mm/mm_init.c b/mm/mm_init.c
> index 077bfe393b5e..513bad672708 100644
> --- a/mm/mm_init.c
> +++ b/mm/mm_init.c
> @@ -26,6 +26,7 @@
> #include <linux/pgtable.h>
> #include <linux/swap.h>
> #include <linux/cma.h>
> +#include <linux/crash_dump.h>
> #include "internal.h"
> #include "slab.h"
> #include "shuffle.h"
> @@ -381,6 +382,11 @@ static void __init find_zone_movable_pfns_for_nodes(void)
> goto out;
> }
>
> + if (is_kdump_kernel()) {
> + pr_warn("The system is under kdump, ignore kernelcore=mirror.\n");
> + goto out;
> + }
> +
> for_each_mem_region(r) {
> if (memblock_is_mirror(r))
> continue;
> --
> 2.25.1
>
--
Sincerely yours,
Mike.
^ permalink raw reply [flat|nested] 2+ messages in thread
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