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f2fs: give an option to enable in-place-updates during fsync to users

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If user wrote F2FS_IPU_FSYNC:4 in /sys/fs/f2fs/ipu_policy, f2fs_sync_file
only starts to try in-place-updates.
And, if the number of dirty pages is over /sys/fs/f2fs/min_fsync_blocks, it
keeps out-of-order manner. Otherwise, it triggers in-place-updates.

This may be used by storage showing very high random write performance.

For example, it can be used when,

Seq. writes (Data) + wait + Seq. writes (Node)

is pretty much slower than,

Rand. writes (Data)

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2014-09-10 16:53:02 -07:00
parent a7ffdbe22c
commit c1ce1b02bb
7 changed files with 33 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

14
fs/f2fs/segment.h
View file

@ -472,15 +472,20 @@ static inline int utilization(struct f2fs_sb_info *sbi)
* F2FS_IPU_UTIL - if FS utilization is over threashold,
* F2FS_IPU_SSR_UTIL - if SSR mode is activated and FS utilization is over
* threashold,
* F2FS_IPU_FSYNC - activated in fsync path only for high performance flash
* storages. IPU will be triggered only if the # of dirty
* pages over min_fsync_blocks.
* F2FS_IPUT_DISABLE - disable IPU. (=default option)
*/
#define DEF_MIN_IPU_UTIL 70
#define DEF_MIN_FSYNC_BLOCKS 8
enum {
F2FS_IPU_FORCE,
F2FS_IPU_SSR,
F2FS_IPU_UTIL,
F2FS_IPU_SSR_UTIL,
F2FS_IPU_FSYNC,
F2FS_IPU_DISABLE,
};
@ -492,10 +497,6 @@ static inline bool need_inplace_update(struct inode *inode)
if (S_ISDIR(inode->i_mode))
return false;
/* this is only set during fdatasync */
if (is_inode_flag_set(F2FS_I(inode), FI_NEED_IPU))
return true;
switch (SM_I(sbi)->ipu_policy) {
case F2FS_IPU_FORCE:
return true;
@ -511,6 +512,11 @@ static inline bool need_inplace_update(struct inode *inode)
if (need_SSR(sbi) && utilization(sbi) > SM_I(sbi)->min_ipu_util)
return true;
break;
case F2FS_IPU_FSYNC:
/* this is only set during fdatasync */
if (is_inode_flag_set(F2FS_I(inode), FI_NEED_IPU))
return true;
break;
case F2FS_IPU_DISABLE:
break;
}