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nvmet: reorder fields in 'struct nvmf_ctrl_options'

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Group some variables based on their sizes to reduce holes.
On x86_64, this shrinks the size of 'struct nvmf_ctrl_options' from 136 to
128 bytes.

When such a structure is allocated in nvmf_create_ctrl(), because of the
way memory allocation works, when 136 bytes were requested, 192 bytes were
allocated.

So this saves 64 bytes per allocation, 1 cache line to hold the whole
structure and a few cycles when zeroing the memory in nvmf_create_ctrl().

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Christophe JAILLET 2023-05-01 14:40:27 +02:00 committed by Keith Busch
parent 9d217fb0e7
commit e64b0c807c
1 changed files with 4 additions and 4 deletions
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8
drivers/nvme/host/fabrics.h
View file

@ -77,6 +77,9 @@ enum {
* with the parsing opts enum.
* @mask: Used by the fabrics library to parse through sysfs options
* on adding a NVMe controller.
* @max_reconnects: maximum number of allowed reconnect attempts before removing
* the controller, (-1) means reconnect forever, zero means remove
* immediately;
* @transport: Holds the fabric transport "technology name" (for a lack of
* better description) that will be used by an NVMe controller
* being added.
@ -96,9 +99,6 @@ enum {
* @discovery_nqn: indicates if the subsysnqn is the well-known discovery NQN.
* @kato: Keep-alive timeout.
* @host: Virtual NVMe host, contains the NQN and Host ID.
* @max_reconnects: maximum number of allowed reconnect attempts before removing
* the controller, (-1) means reconnect forever, zero means remove
* immediately;
* @dhchap_secret: DH-HMAC-CHAP secret
* @dhchap_ctrl_secret: DH-HMAC-CHAP controller secret for bi-directional
* authentication
@ -112,6 +112,7 @@ enum {
*/
struct nvmf_ctrl_options {
unsigned mask;
int max_reconnects;
char *transport;
char *subsysnqn;
char *traddr;
@ -125,7 +126,6 @@ struct nvmf_ctrl_options {
bool duplicate_connect;
unsigned int kato;
struct nvmf_host *host;
int max_reconnects;
char *dhchap_secret;
char *dhchap_ctrl_secret;
bool disable_sqflow;