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| author | Junchao Sun <sunjunchao2870@gmail.com> | 2024-06-03 21:15:24 +0800 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2024-08-20 21:37:00 -0400 |
| commit | a3c3eecc7c876c7f2b09d9ee1acf5b8b85996cff (patch) | |
| tree | 80bccc1e0ec9c47946a5502b49459c53bb961ea7 /fs/ext4/ext4.h | |
| parent | 47ac09b91befbb6a235ab620c32af719f8208399 (diff) | |
ext4: adjust the layout of the ext4_inode_info structure to save memory
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>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 08acd152261e..3d57acae0925 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -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; |