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zsmalloc: skip chain size calculation for pow_of_2 classes

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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: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2023-01-18 09:52:08 +09:00 committed by Andrew Morton
parent 6260ae3583
commit e1d1f35469
1 changed files with 3 additions and 0 deletions
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3
mm/zsmalloc.c
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@ -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;