kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-10-18 19:12:56 +00:00
Code Issues Releases Packages Activity

f2fs: reduce stack memory cost by using bitfield in struct f2fs_io_info

Browse source 
[ Upstream commit 2eae077e6e ]

This patch tries to use bitfield in struct f2fs_io_info to improve
memory usage.

struct f2fs_io_info {
...
	unsigned int need_lock:8;	/* indicate we need to lock cp_rwsem */
	unsigned int version:8;		/* version of the node */
	unsigned int submitted:1;	/* indicate IO submission */
	unsigned int in_list:1;		/* indicate fio is in io_list */
	unsigned int is_por:1;		/* indicate IO is from recovery or not */
	unsigned int retry:1;		/* need to reallocate block address */
	unsigned int encrypted:1;	/* indicate file is encrypted */
	unsigned int post_read:1;	/* require post read */
...
};

After this patch, size of struct f2fs_io_info reduces from 136 to 120.

[Nathan: fix a compile warning (single-bit-bitfield-constant-conversion)]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Stable-dep-of: fd244524c2 ("f2fs: compress: fix to cover normal cluster write with cp_rwsem")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chao Yu 2023-02-02 15:04:56 +08:00 • committed by Sasha Levin
commit ed22aef701
7 changed files with 28 additions and 27 deletions
Download patch file Download diff file Expand all files Collapse all files