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Subject[PATCH 04/12] percpu: manage chunks based on contig_bits instead of free_bytes
Date
When a chunk becomes fragmented, it can end up having a large number of
small allocation areas free. The free_bytes sorting of chunks leads to
unnecessary checking of chunks that cannot satisfy the allocation.
Switch to contig_bits sorting to prevent scanning chunks that may not be
able to service the allocation request.

Signed-off-by: Dennis Zhou <dennis@kernel.org>
---
mm/percpu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index b40112b2fc59..c996bcffbb2a 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -234,7 +234,7 @@ static int pcpu_chunk_slot(const struct pcpu_chunk *chunk)
if (chunk->free_bytes < PCPU_MIN_ALLOC_SIZE || chunk->contig_bits == 0)
return 0;

- return pcpu_size_to_slot(chunk->free_bytes);
+ return pcpu_size_to_slot(chunk->contig_bits * PCPU_MIN_ALLOC_SIZE);
}

/* set the pointer to a chunk in a page struct */
--
2.17.1
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