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Subject[PATCH 1/2] f2fs: introduce time and interval facility
Date
This patch adds time and interval arrays to store some timing variables.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/checkpoint.c | 2 +-
fs/f2fs/f2fs.h | 21 ++++++++++++++++++++-
fs/f2fs/segment.c | 2 +-
fs/f2fs/super.c | 7 +++----
4 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 5dbafd5..3842af9 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -1139,7 +1139,7 @@ int write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
"checkpoint: version = %llx", ckpt_ver);

/* do checkpoint periodically */
- sbi->cp_expires = round_jiffies_up(jiffies + HZ * sbi->cp_interval);
+ f2fs_update_time(sbi, CP_TIME);
trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
out:
mutex_unlock(&sbi->cp_mutex);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ae0007d..603266c 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -721,6 +721,11 @@ enum {
SBI_POR_DOING, /* recovery is doing or not */
};

+enum {
+ CP_TIME,
+ MAX_TIME,
+};
+
struct f2fs_sb_info {
struct super_block *sb; /* pointer to VFS super block */
struct proc_dir_entry *s_proc; /* proc entry */
@@ -747,7 +752,8 @@ 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 */
+ unsigned long last_time[MAX_TIME]; /* to store time in jiffies */
+ long interval_time[MAX_TIME]; /* to store thresholds */

struct inode_management im[MAX_INO_ENTRY]; /* manage inode cache */

@@ -837,6 +843,19 @@ struct f2fs_sb_info {
unsigned int shrinker_run_no;
};

+static inline void f2fs_update_time(struct f2fs_sb_info *sbi, int type)
+{
+ sbi->last_time[type] = jiffies;
+}
+
+static inline bool f2fs_time_over(struct f2fs_sb_info *sbi, int type)
+{
+ struct timespec ts = {sbi->interval_time[type], 0};
+ unsigned long interval = timespec_to_jiffies(&ts);
+
+ return jiffies > sbi->last_time[type] + interval;
+}
+
/*
* Inline functions
*/
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index c7bbc91..fed23d5 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -293,7 +293,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
if (!available_free_memory(sbi, NAT_ENTRIES) ||
excess_prefree_segs(sbi) ||
!available_free_memory(sbi, INO_ENTRIES) ||
- jiffies > sbi->cp_expires) {
+ f2fs_time_over(sbi, CP_TIME)) {
if (test_opt(sbi, DATA_FLUSH))
sync_dirty_inodes(sbi, FILE_INODE);
f2fs_sync_fs(sbi->sb, true);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index f5cc790..787047f 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -218,7 +218,7 @@ F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
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);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);

#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
static struct attribute *f2fs_attrs[] = {
@@ -1122,7 +1122,7 @@ 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;
+ sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
clear_sbi_flag(sbi, SBI_NEED_FSCK);

INIT_LIST_HEAD(&sbi->s_list);
@@ -1467,8 +1467,7 @@ try_onemore:
f2fs_commit_super(sbi, true);
}

- sbi->cp_expires = round_jiffies_up(jiffies);
-
+ f2fs_update_time(sbi, CP_TIME);
return 0;

free_kobj:
--
2.6.3
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