linux/fs/f2fs
Jaegeuk Kim b1c57c1caa f2fs: add a sysfs entry to control max_victim_search
Previously during SSR and GC, the maximum number of retrials to find a victim
segment was hard-coded by MAX_VICTIM_SEARCH, 4096 by default.

This number makes an effect on IO locality, when SSR mode is activated, which
results in performance fluctuation on some low-end devices.

If max_victim_search = 4, the victim will be searched like below.
("D" represents a dirty segment, and "*" indicates a selected victim segment.)

 D1 D2 D3 D4 D5 D6 D7 D8 D9
[   *       ]
      [   *    ]
            [         * ]
	                [ ....]

This patch adds a sysfs entry to control the number dynamically through:
  /sys/fs/f2fs/$dev/max_victim_search

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2014-01-08 13:45:08 +09:00
..
acl.c f2fs: fix a deadlock during init_acl procedure 2013-10-28 13:39:09 +09:00
acl.h f2fs: fix a deadlock during init_acl procedure 2013-10-28 13:39:09 +09:00
checkpoint.c f2fs: convert max_orphans to a field of f2fs_sb_info 2013-12-26 20:37:52 +09:00
data.c f2fs: handle errors correctly during f2fs_reserve_block 2014-01-06 16:42:21 +09:00
debug.c f2fs: add the number of inline_data files to status info 2014-01-06 16:42:20 +09:00
dir.c f2fs: handle errors correctly during f2fs_reserve_block 2014-01-06 16:42:21 +09:00
f2fs.h f2fs: add a sysfs entry to control max_victim_search 2014-01-08 13:45:08 +09:00
file.c f2fs: improve write performance under frequent fsync calls 2014-01-08 11:16:20 +09:00
gc.c f2fs: add a sysfs entry to control max_victim_search 2014-01-08 13:45:08 +09:00
gc.h f2fs: add a sysfs entry to control max_victim_search 2014-01-08 13:45:08 +09:00
hash.c f2fs: unify string length declarations and usage 2012-12-28 11:27:53 +09:00
inline.c f2fs: avoid to read inline data except first page 2014-01-06 16:42:22 +09:00
inode.c f2fs: add the number of inline_data files to status info 2014-01-06 16:42:20 +09:00
Kconfig f2fs: introduce CONFIG_F2FS_CHECK_FS for BUG_ON control 2013-10-29 15:43:01 +09:00
Makefile f2fs: key functions to handle inline data 2013-12-26 20:40:09 +09:00
namei.c f2fs: avoid to set wrong pino of inode when rename dir 2013-12-23 10:42:51 +09:00
node.c f2fs: improve write performance under frequent fsync calls 2014-01-08 11:16:20 +09:00
node.h f2fs: update several comments 2013-12-23 10:26:03 +09:00
recovery.c f2fs: add inline_data recovery routine 2014-01-06 16:42:20 +09:00
segment.c f2fs: improve write performance under frequent fsync calls 2014-01-08 11:16:20 +09:00
segment.h f2fs: introduce sysfs entry to control in-place-update policy 2013-12-23 10:18:07 +09:00
super.c f2fs: add a sysfs entry to control max_victim_search 2014-01-08 13:45:08 +09:00
xattr.c f2fs: add unlikely() macro for compiler more aggressively 2013-12-23 10:18:06 +09:00
xattr.h f2fs: support the inline xattrs 2013-08-26 20:15:23 +09:00