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ext4: adjust the layout of the ext4_inode_info structure to save memory

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Using pahole, we can see that there are some padding holes
in the current ext4_inode_info structure. Adjusting the
layout of ext4_inode_info can reduce these holes,
resulting in the size of the structure decreasing
from 2424 bytes to 2408 bytes.

Signed-off-by: Junchao Sun <sunjunchao2870@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20240603131524.324224-1-sunjunchao2870@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Junchao Sun 2024-06-03 21:15:24 +08:00 committed by Theodore Ts'o
parent 47ac09b91b
commit a3c3eecc7c
1 changed files with 5 additions and 5 deletions
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10
fs/ext4/ext4.h
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@ -1058,6 +1058,7 @@ struct ext4_inode_info {
/* Number of ongoing updates on this inode */
atomic_t i_fc_updates;
atomic_t i_unwritten; /* Nr. of inflight conversions pending */
/* Fast commit wait queue for this inode */
wait_queue_head_t i_fc_wait;
@ -1106,6 +1107,10 @@ struct ext4_inode_info {
/* mballoc */
atomic_t i_prealloc_active;
/* allocation reservation info for delalloc */
/* In case of bigalloc, this refer to clusters rather than blocks */
unsigned int i_reserved_data_blocks;
struct rb_root i_prealloc_node;
rwlock_t i_prealloc_lock;
@ -1122,10 +1127,6 @@ struct ext4_inode_info {
/* ialloc */
ext4_group_t i_last_alloc_group;
/* allocation reservation info for delalloc */
/* In case of bigalloc, this refer to clusters rather than blocks */
unsigned int i_reserved_data_blocks;
/* pending cluster reservations for bigalloc file systems */
struct ext4_pending_tree i_pending_tree;
@ -1149,7 +1150,6 @@ struct ext4_inode_info {
*/
struct list_head i_rsv_conversion_list;
struct work_struct i_rsv_conversion_work;
atomic_t i_unwritten; /* Nr. of inflight conversions pending */
spinlock_t i_block_reservation_lock;