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ceph: reorder fields in 'struct ceph_snapid_map'

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Group some variables based on their sizes to reduce holes.
On x86_64, this shrinks the size of 'struct ceph_snapid_map' from 72 to 64
bytes.

When such a structure is allocated, because of the way memory allocation
works, when 72 bytes were requested, 96 bytes were allocated.

So, on x86_64, this change saves 32 bytes per allocation and has the
structure fit in a single cacheline.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Christophe JAILLET 2023-04-27 20:05:42 +02:00 committed by Ilya Dryomov
parent a5ffd7b6e9
commit db2993a423
1 changed files with 1 additions and 1 deletions
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2
fs/ceph/mds_client.h
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@ -355,8 +355,8 @@ struct ceph_snapid_map {
struct rb_node node;
struct list_head lru;
atomic_t ref;
u64 snap;
dev_t dev;
u64 snap;
unsigned long last_used;
};