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| author | Amir Goldstein <amir73il@gmail.com> | 2018-07-05 09:25:43 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2018-07-09 02:58:24 +0300 |
| commit | 69448867abcb231afaa7891ff9d9fd04b2b94a0d (patch) | |
| tree | 048d1b06f729cdbca51eb35d3bf04a4acc07cd6f /include/linux/fs.h | |
| parent | b7d3f17fa7a93250daec8c679bf8069715dbeb25 (diff) | |
| download | linux-69448867abcb231afaa7891ff9d9fd04b2b94a0d.tar.xz | |
fs: shave 8 bytes off of struct inode
Here is a link to Linus' reply to Jan's concern about making
i_blkbibts byte addressable:
https://marc.info/?l=linux-fsdevel&m=152882624707975&w=2
Here is a link to an lkp.org report about potential performance
improvement in some workload, which could(?) be related to packing
i_blkbits closer to i_bytes/i_lock:
https://marc.info/?l=linux-fsdevel&m=153077048108198&w=2
Changes since v1:
- Add links to relevant discussions
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index f140c11d35dd..9b00676f5d9d 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -275,6 +275,7 @@ struct writeback_control; /* * Write life time hint values. + * Stored in struct inode as u8. */ enum rw_hint { WRITE_LIFE_NOT_SET = 0, @@ -609,8 +610,8 @@ struct inode { struct timespec64 i_ctime; spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ unsigned short i_bytes; - unsigned int i_blkbits; - enum rw_hint i_write_hint; + u8 i_blkbits; + u8 i_write_hint; blkcnt_t i_blocks; #ifdef __NEED_I_SIZE_ORDERED |