Commit 3e54097b authored by Dennis Zhou's avatar Dennis Zhou
Browse files

percpu: manage chunks based on contig_bits instead of free_bytes 



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: default avatarDennis Zhou <dennis@kernel.org>
Reviewed-by: default avatarPeng Fan <peng.fan@nxp.com>
parent d9f3a01e

mm/percpu.c

+1 −1
Original line number Diff line number Diff line
@@ -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 */