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block: re-organize fields of 'struct hd_part'

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Put all fields accessed in IO path together at the beginning
of the struct, so that all can be fetched in single cacheline.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@infradead.org>
Cc: Yufen Yu <yuyufen@huawei.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Hou Tao <houtao1@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2020-05-08 16:17:57 +08:00 committed by Jens Axboe
parent 07c4e1e834
commit 520138c3b9
1 changed files with 8 additions and 7 deletions
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15
include/linux/genhd.h
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@ -71,6 +71,14 @@ struct hd_struct {
#if BITS_PER_LONG==32 && defined(CONFIG_SMP)
seqcount_t nr_sects_seq;
#endif
unsigned long stamp;
#ifdef CONFIG_SMP
struct disk_stats __percpu *dkstats;
#else
struct disk_stats dkstats;
#endif
struct percpu_ref ref;
sector_t alignment_offset;
unsigned int discard_alignment;
struct device __dev;
@ -80,13 +88,6 @@ struct hd_struct {
#ifdef CONFIG_FAIL_MAKE_REQUEST
int make_it_fail;
#endif
unsigned long stamp;
#ifdef CONFIG_SMP
struct disk_stats __percpu *dkstats;
#else
struct disk_stats dkstats;
#endif
struct percpu_ref ref;
struct rcu_work rcu_work;
};