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| author | Ming Lei <tom.leiming@gmail.com> | 2015-07-16 11:16:45 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-07-17 08:41:53 -0600 |
| commit | 6c71013ecb7e2bddbed9f5b95e7aed22c491daa9 (patch) | |
| tree | 773a3ebe4289815e677ce2b357c665cba5292c0e /block/genhd.c | |
| parent | b54e5ed8f285d62c0d242c4ef9da90937994db02 (diff) | |
| download | linux-stable-6c71013ecb7e2bddbed9f5b95e7aed22c491daa9.tar.gz linux-stable-6c71013ecb7e2bddbed9f5b95e7aed22c491daa9.tar.bz2 linux-stable-6c71013ecb7e2bddbed9f5b95e7aed22c491daa9.zip | |
block: partition: convert percpu ref
Percpu refcount is the perfect match for partition's case,
and the conversion is quite straight.
With the convertion, one pair of atomic inc/dec can be saved
for accounting block I/O, which is run in hot path of block I/O.
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/genhd.c')
| -rw-r--r-- | block/genhd.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/block/genhd.c b/block/genhd.c index 85df45292dba..0c706f33a599 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1284,7 +1284,11 @@ struct gendisk *alloc_disk_node(int minors, int node_id) * converted to make use of bd_mutex and sequence counters. */ seqcount_init(&disk->part0.nr_sects_seq); - hd_ref_init(&disk->part0); + if (hd_ref_init(&disk->part0)) { + hd_free_part(&disk->part0); + kfree(disk); + return NULL; + } disk->minors = minors; rand_initialize_disk(disk); |