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percpu: add first_bit to keep track of the first free in the bitmap

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This patch adds first_bit to keep track of the first free bit in the
bitmap. This hint helps prevent scanning of fully allocated blocks.

Signed-off-by: Dennis Zhou <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
This commit is contained in:
Dennis Zhou (Facebook) 2017-07-24 19:02:13 -04:00 • committed by Tejun Heo
commit 86b442fbce
3 changed files with 17 additions and 3 deletions
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2
mm/percpu-internal.h
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@ -36,7 +36,7 @@ struct pcpu_chunk {
struct pcpu_block_md *md_blocks; /* metadata blocks */
void *data; /* chunk data */
int first_free; /* no free below this */
int first_bit; /* no free below this */
bool immutable; /* no [de]population allowed */
int start_offset; /* the overlap with the previous
region to have a page aligned