Commit e1d1f354 authored by Sergey Senozhatsky's avatar Sergey Senozhatsky Committed by Andrew Morton
Browse files

zsmalloc: skip chain size calculation for pow_of_2 classes 

If a class size is power of 2 then it wastes no memory and the best
configuration is 1 physical page per-zspage.

Link: https://lkml.kernel.org/r/20230118005210.2814763-3-senozhatsky@chromium.org


Signed-off-by: default avatarSergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: default avatarMinchan Kim <minchan@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 6260ae35

mm/zsmalloc.c

+3 −0
Original line number Diff line number Diff line
@@ -2370,6 +2370,9 @@ static int calculate_zspage_chain_size(int class_size) 
	int i, min_waste = INT_MAX;

	int chain_size = 1;



	if (is_power_of_2(class_size))

		return chain_size;



	for (i = 1; i <= ZS_MAX_PAGES_PER_ZSPAGE; i++) {

		int waste;