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dm: move hot dm_io members to same cacheline as dm_target_io

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Just saves some cacheline bouncing for members accessed during cloned
bio submission and completion.

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mike Snitzer 2022-03-26 14:38:07 -04:00
parent 6cbce280fc
commit 982b48ae25
1 changed files with 7 additions and 5 deletions
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12
drivers/md/dm-core.h
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@ -250,17 +250,19 @@ static inline bool dm_tio_is_normal(struct dm_target_io *tio)
#define DM_IO_MAGIC 19577
struct dm_io {
unsigned short magic;
blk_short_t flags;
atomic_t io_count;
struct mapped_device *md;
struct bio *orig_bio;
blk_status_t status;
spinlock_t lock;
unsigned long start_time;
void *data;
struct hlist_node node;
struct task_struct *map_task;
struct dm_stats_aux stats_aux;
blk_short_t flags;
blk_status_t status;
atomic_t io_count;
struct mapped_device *md;
struct bio *orig_bio;
/* last member of dm_target_io is 'struct bio' */
struct dm_target_io tio;
};