diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2026-05-28 20:31:45 +0300 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2026-06-04 11:28:10 +0300 |
| commit | ac75b922bb67cc8edb52006c9346dc0ca91d04c8 (patch) | |
| tree | 491aa707e9a74fe3094e97b22eadecb2c6282f29 /include/linux | |
| parent | 2911b935825523a71a71eecfe908902d181c041e (diff) | |
| download | linux-ac75b922bb67cc8edb52006c9346dc0ca91d04c8.tar.xz | |
buffer: Remove b_end_io
This shrinks buffer_head by 8 bytes, letting us pack more buffer heads
per slab. With a Debian config, it shrinks from 104 bytes to 96 bytes
which is 42 objects per 4KiB page rather than 39, a 7% reduction in the
amount of memory used.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://patch.msgid.link/20260528173150.1093780-33-willy@infradead.org
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/buffer_head.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 7629130d42c4..1ee56c9f2327 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -46,7 +46,6 @@ enum bh_state_bits { struct page; struct buffer_head; struct address_space; -typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate); /* * Historically, a buffer_head was used to map a single block @@ -70,8 +69,7 @@ struct buffer_head { char *b_data; /* pointer to data within the page */ struct block_device *b_bdev; - bh_end_io_t *b_end_io; /* I/O completion */ - void *b_private; /* reserved for b_end_io */ + void *b_private; /* reserved for bio_end_io */ struct list_head b_assoc_buffers; /* associated with another mapping */ struct mapping_metadata_bhs *b_mmb; /* head of the list of metadata bhs * this buffer is associated with */ |