Hi Jaegeuk, > -----Original Message----- > From: Jaegeuk Kim [mailto:jaegeuk@xxxxxxxxxx] > Sent: Saturday, January 09, 2016 9:29 AM > To: linux-kernel@xxxxxxxxxxxxxxx; linux-fsdevel@xxxxxxxxxxxxxxx; > linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx > Cc: Jaegeuk Kim > Subject: [f2fs-dev] [PATCH 1/2] f2fs: introduce time and interval facility > > This patch adds time and interval arrays to store some timing variables. > > Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx> > --- > 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; How about using time_after like checkpatch.pl recommended? WARNING: Comparing jiffies is almost always wrong; prefer time_after, time_before and friends #70: FILE: fs/f2fs/f2fs.h:856: + return jiffies > sbi->last_time[type] + interval; Thanks, > +} > + > /* > * 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 > > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. 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