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f2fs: introduce a periodic checkpoint flow 

This patch introduces a periodic checkpoint feature.
Note that, this is not enforcing to conduct checkpoints very strictly in terms
of trigger timing, instead just hope to help user experiences.
The default value is 60 seconds.

Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-10-05 14:49:57 -07:00
parent 5c26743474
commit 60b99b486b
5 changed files with 19 additions and 1 deletions
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6
Documentation/ABI/testing/sysfs-fs-f2fs
View File

@ -80,3 +80,9 @@ Date: February 2015
Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
Description:
Controls the trimming rate in batch mode.
What: /sys/fs/f2fs/<disk>/cp_interval
Date: October 2015
Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
Description:
Controls the checkpoint timing.

3
fs/f2fs/checkpoint.c
View File

@ -1114,6 +1114,9 @@ void write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
if (cpc->reason == CP_RECOVERY)
f2fs_msg(sbi->sb, KERN_NOTICE,
"checkpoint: version = %llx", ckpt_ver);
/* do checkpoint periodically */
sbi->cp_expires = round_jiffies_up(jiffies + HZ * sbi->cp_interval);
out:
mutex_unlock(&sbi->cp_mutex);
trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");

2
fs/f2fs/f2fs.h
View File

@ -124,6 +124,7 @@ enum {
(SM_I(sbi)->trim_sections * (sbi)->segs_per_sec)
#define BATCHED_TRIM_BLOCKS(sbi) \
(BATCHED_TRIM_SEGMENTS(sbi) << (sbi)->log_blocks_per_seg)
#define DEF_CP_INTERVAL 60 /* 60 secs */
struct cp_control {
int reason;
@ -734,6 +735,7 @@ struct f2fs_sb_info {
struct rw_semaphore node_write; /* locking node writes */
struct mutex writepages; /* mutex for writepages() */
wait_queue_head_t cp_wait;
long cp_expires, cp_interval; /* next expected periodic cp */
struct inode_management im[MAX_INO_ENTRY]; /* manage inode cache */

4
fs/f2fs/segment.c
View File

@ -15,6 +15,7 @@
#include <linux/prefetch.h>
#include <linux/kthread.h>
#include <linux/swap.h>
#include <linux/timer.h>
#include "f2fs.h"
#include "segment.h"
@ -315,7 +316,8 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
/* checkpoint is the only way to shrink partial cached entries */
if (!available_free_memory(sbi, NAT_ENTRIES) ||
excess_prefree_segs(sbi) ||
!available_free_memory(sbi, INO_ENTRIES))
!available_free_memory(sbi, INO_ENTRIES) ||
jiffies > sbi->cp_expires)
f2fs_sync_fs(sbi->sb, true);
}

5
fs/f2fs/super.c
View File

@ -215,6 +215,7 @@ F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, cp_interval);
#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
static struct attribute *f2fs_attrs[] = {
@ -231,6 +232,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(max_victim_search),
ATTR_LIST(dir_level),
ATTR_LIST(ram_thresh),
ATTR_LIST(cp_interval),
NULL,
};
@ -1014,6 +1016,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
atomic_set(&sbi->nr_pages[i], 0);
sbi->dir_level = DEF_DIR_LEVEL;
sbi->cp_interval = DEF_CP_INTERVAL;
clear_sbi_flag(sbi, SBI_NEED_FSCK);
INIT_LIST_HEAD(&sbi->s_list);
@ -1350,6 +1353,8 @@ try_onemore:
f2fs_commit_super(sbi, true);
}
sbi->cp_expires = round_jiffies_up(jiffies);
return 0;
free_kobj: