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SubjectRe: [PATCH] memblock: avoid some repeat when add new range

On 10:41 Thu 09 Jun , tjytimi wrote:
> The worst case is that the new memory range overlaps all existing
> regions,which need type->cnt + 1 free area of struct memblock_region.
> So if type->cnt + 1 + type->cnt is less than type->max,we can insert
> regions directly.And becase of merge operation in the end of function,
> tpye->cnt increase slowly for many cases.So this patch can avoid
> unnecessary repeat for many cases when add new memory range.
>
> Signed-off-by: tjytimi <tjytimi@163.com>
Can you fix the author/signed-off tag with your real legal name?

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v4.18#n460

> ---
> mm/memblock.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/mm/memblock.c b/mm/memblock.c
> index e4f03a6e8..243cd7de5 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -602,6 +602,9 @@ static int __init_memblock memblock_add_range(struct memblock_type *type,
> base = obase;
> nr_new = 0;
>
> + if (type->cnt<<1 < type->max - 1)
> + insert = true;
> +
> for_each_memblock_type(idx, type, rgn) {
> phys_addr_t rbase = rgn->base;
> phys_addr_t rend = rbase + rgn->size;
> --
> 2.32.0
>

--
Yixun Lan (dlan)
Gentoo Linux Developer
GPG Key ID AABEFD55

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