memblock: avoid some repeat when add new range

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The worst case is that the new memory range overlaps all existing
regions, which requires type->cnt + 1 empty struct memblock_region slots in
the type->regions array.
So if type->cnt + 1 + type->cnt is less than type->max, we can insert
regions directly rather than calculate the needed amount before the
insertion.
And becase of merge operation in the end of function, tpye->cnt will
increase slowly for many cases.

This change allows to avoid unnecessary repeat of memblock ranges traversal
for many cases when adding new memory range.

Signed-off-by: Jinyu Tang <tjytimi@163.com>
[rppt: massaged comment and changelog text]
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>

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Jinyu Tang 2022-06-15 17:40:15 +08:00 • committed by Mike Rapoport

parent 03c765b0e3

commit 28e1a8f4b0

1 changed files with 11 additions and 0 deletions

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mm/memblock.c

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