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nvmet: Reorder fields in 'struct nvmet_ns'

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Group some variables based on their sizes to reduce holes.
On x86_64, this shrinks the size of 'struct nvmet_ns' from 520 to 512
bytes.

When such a structure is allocated in nvmet_ns_alloc(), because of the way
memory allocation works, when 520 bytes were requested, 1024 bytes were
allocated.

So, on x86_64, this change saves 512 bytes per allocation.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Christophe JAILLET 2023-04-27 21:47:45 +02:00 committed by Keith Busch
parent d0dd594bed
commit 9d16d26477
1 changed files with 1 additions and 1 deletions
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2
drivers/nvme/target/nvmet.h
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@ -79,8 +79,8 @@ struct nvmet_ns {
struct completion disable_done;
mempool_t *bvec_pool;
int use_p2pmem;
struct pci_dev *p2p_dev;
int use_p2pmem;
int pi_type;
int metadata_size;
u8 csi;