On Tue, 7 Jun 2022 at 11:16, Wupeng Ma <mawupeng1@xxxxxxxxxx> wrote:
>
> From: Ma Wupeng <mawupeng1@xxxxxxxxxx>
>
> If system have some mirrored memory and mirrored feature is not specified
> in boot parameter, the basic mirrored feature will be enabled and this will
> lead to the following situations:
>
> - memblock memory allocation prefers mirrored region. This may have some
> unexpected influence on numa affinity.
>
> - contiguous memory will be split into several parts if parts of them
> is mirrored memory via memblock_mark_mirror().
>
> To fix this, variable mirrored_kernelcore will be checked before calling
> efi_find_mirror() which will enable basic mirrored feature and this
> variable is true if kernelcore=mirror is added in the kernel parameters.
>
> Signed-off-by: Ma Wupeng <mawupeng1@xxxxxxxxxx>
This seems like the wrong place to do this. If mirrored memory is
irrelevant to memblock, it should ignore the attribute. So I think
this check belongs in mm/memblock.c instead.
> ---
> drivers/firmware/efi/efi.c | 3 +++
> include/linux/mm.h | 2 ++
> mm/page_alloc.c | 2 +-
> 3 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index 79c232e07de7..8a5edcb0dd82 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -454,6 +454,9 @@ void __init efi_find_mirror(void)
> if (!efi_enabled(EFI_MEMMAP))
> return;
>
> + if (!mirrored_kernelcore)
> + return;
> +
> for_each_efi_memory_desc(md) {
> unsigned long long start = md->phys_addr;
> unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index bc8f326be0ce..741ac7d022c3 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2540,6 +2540,8 @@ extern void get_pfn_range_for_nid(unsigned int nid,
> unsigned long *start_pfn, unsigned long *end_pfn);
> extern unsigned long find_min_pfn_with_active_regions(void);
>
> +extern bool mirrored_kernelcore;
> +
> #ifndef CONFIG_NUMA
> static inline int early_pfn_to_nid(unsigned long pfn)
> {
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index e008a3df0485..cf6f70aba787 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -356,7 +356,7 @@ static unsigned long required_kernelcore_percent __initdata;
> static unsigned long required_movablecore __initdata;
> static unsigned long required_movablecore_percent __initdata;
> static unsigned long zone_movable_pfn[MAX_NUMNODES] __initdata;
> -static bool mirrored_kernelcore __meminitdata;
> +bool mirrored_kernelcore __meminitdata;
>
> /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
> int movable_zone;
> --
> 2.25.1
>
