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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: Dennis Zhou <dennis@kernel.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Dennis Zhou 2019-02-25 13:43:38 -08:00
parent d9f3a01eeb
commit 3e54097beb
1 changed files with 1 additions and 1 deletions
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2
mm/percpu.c
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@ -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 */