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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>
This commit is contained in:
Amir Goldstein 2018-07-05 09:25:43 +03:00 committed by Al Viro
parent b7d3f17fa7
commit 69448867ab
1 changed files with 3 additions and 2 deletions
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5
include/linux/fs.h
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@ -275,6 +275,7 @@ struct writeback_control;
/* /*
* Write life time hint values. * Write life time hint values.
* Stored in struct inode as u8.
*/ */
enum rw_hint { enum rw_hint {
WRITE_LIFE_NOT_SET = 0, WRITE_LIFE_NOT_SET = 0,
@ -609,8 +610,8 @@ struct inode {
struct timespec64 i_ctime; struct timespec64 i_ctime;
spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
unsigned short i_bytes; unsigned short i_bytes;
unsigned int i_blkbits; u8 i_blkbits;
enum rw_hint i_write_hint; u8 i_write_hint;
blkcnt_t i_blocks; blkcnt_t i_blocks;
#ifdef __NEED_I_SIZE_ORDERED #ifdef __NEED_I_SIZE_ORDERED