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author | Chao Yu <chao@kernel.org> | 2023-02-02 10:04:56 +0300 |
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committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2023-02-03 00:37:16 +0300 |
commit | 2eae077e6e46f9046d383631145750e043820dce (patch) | |
tree | de30012f63a74b8e66901b458ca58a6eaaf7dc2a /tools | |
parent | a28bca0f47feb5cdfc22be0e563bd4da2aed74f7 (diff) | |
download | linux-2eae077e6e46f9046d383631145750e043820dce.tar.xz |
f2fs: reduce stack memory cost by using bitfield in struct f2fs_io_info
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>
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions