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Message-ID: <5d74d46b-8141-f048-9c0a-459c82b2c449@kernel.org>
Date: Tue, 11 Sep 2018 00:01:43 +0800
From: Chao Yu <chao@...nel.org>
To: Sahitya Tummala <stummala@...eaurora.org>,
Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <yuchao0@...wei.com>,
linux-f2fs-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: add new idle interval timing for
discard and gc paths
On 2018/9/10 11:47, Sahitya Tummala wrote:
> This helps to control the frequency of submission of discard and
> GC requests independently, based on the need. The sleep timing of
> GC thread is now aligned with this idle time when the dev is busy,
> to avoid unnecessary periodic wakeups.
>
> Suggested-by: Chao Yu <yuchao0@...wei.com>
> Signed-off-by: Sahitya Tummala <stummala@...eaurora.org>
> ---
> v2:
> -fix __issue_discard_cmd_orderly() path
>
> Documentation/ABI/testing/sysfs-fs-f2fs | 17 ++++++++++++++++-
> fs/f2fs/f2fs.h | 31 +++++++++++++++++++++++++++----
> fs/f2fs/gc.c | 6 ++++--
> fs/f2fs/segment.c | 16 ++++++----------
> fs/f2fs/super.c | 2 ++
> fs/f2fs/sysfs.c | 5 +++++
> 6 files changed, 60 insertions(+), 17 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index 94a24ae..3ac4177 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -121,7 +121,22 @@ What: /sys/fs/f2fs/<disk>/idle_interval
> Date: January 2016
> Contact: "Jaegeuk Kim" <jaegeuk@...nel.org>
> Description:
> - Controls the idle timing.
> + Controls the idle timing for all paths other than
> + discard and gc path.
> +
> +What: /sys/fs/f2fs/<disk>/discard_idle_interval
> +Date: September 2018
> +Contact: "Chao Yu" <yuchao0@...wei.com>
> +Contact: "Sahitya Tummala" <stummala@...eaurora.org>
> +Description:
> + Controls the idle timing for discard path.
> +
> +What: /sys/fs/f2fs/<disk>/gc_idle_interval
> +Date: September 2018
> +Contact: "Chao Yu" <yuchao0@...wei.com>
> +Contact: "Sahitya Tummala" <stummala@...eaurora.org>
> +Description:
> + Controls the idle timing for gc path.
>
> What: /sys/fs/f2fs/<disk>/iostat_enable
> Date: August 2017
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index abf9256..6070681 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1093,6 +1093,8 @@ enum {
> enum {
> CP_TIME,
> REQ_TIME,
> + DISCARD_TIME,
> + GC_TIME,
> MAX_TIME,
> };
>
> @@ -1347,14 +1349,35 @@ 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)
> +static inline bool f2fs_time_over_cp(struct f2fs_sb_info *sbi)
> +{
> + unsigned long interval = sbi->interval_time[CP_TIME] * HZ;
> +
> + return time_after(jiffies, sbi->last_time[CP_TIME] + interval);
> +}
> +
> +static inline bool f2fs_time_over_req(struct f2fs_sb_info *sbi, int type)
> +{
> + unsigned long interval = sbi->interval_time[type] * HZ;
> +
> + return time_after(jiffies, sbi->last_time[REQ_TIME] + interval);
> +}
> +
> +static inline unsigned int f2fs_get_wait_time(struct f2fs_sb_info *sbi,
> + int type)
> {
> unsigned long interval = sbi->interval_time[type] * HZ;
> + unsigned int wait_ms = 0;
> + long delta;
> +
> + delta = (sbi->last_time[REQ_TIME] + interval) - jiffies;
> + if (delta > 0)
> + wait_ms = jiffies_to_msecs(delta);
>
> - return time_after(jiffies, sbi->last_time[type] + interval);
> + return wait_ms;
> }
>
> -static inline bool is_idle(struct f2fs_sb_info *sbi)
> +static inline bool is_idle(struct f2fs_sb_info *sbi, int type)
> {
> struct block_device *bdev = sbi->sb->s_bdev;
> struct request_queue *q = bdev_get_queue(bdev);
> @@ -1363,7 +1386,7 @@ static inline bool is_idle(struct f2fs_sb_info *sbi)
> if (rl->count[BLK_RW_SYNC] || rl->count[BLK_RW_ASYNC])
> return false;
>
> - return f2fs_time_over(sbi, REQ_TIME);
> + return f2fs_time_over_req(sbi, type);
> }
>
> /*
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 5c8d004..c0bafea 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -83,8 +83,10 @@ static int gc_thread_func(void *data)
> if (!mutex_trylock(&sbi->gc_mutex))
> goto next;
>
> - if (!is_idle(sbi)) {
> - increase_sleep_time(gc_th, &wait_ms);
> + if (!is_idle(sbi, GC_TIME)) {
> + wait_ms = f2fs_get_wait_time(sbi, GC_TIME);
It seems this patch changes the method of increasing wait_ms here, if device is
busy, we may wake up GC thread earlier than before, not sure we should do this.
To Jaegeuk, how do you think of this?
Thanks,
> + if (!wait_ms)
> + increase_sleep_time(gc_th, &wait_ms);
> mutex_unlock(&sbi->gc_mutex);
> goto next;
> }
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index c5024f8..2d15733 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -511,7 +511,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
> else
> f2fs_build_free_nids(sbi, false, false);
>
> - if (!is_idle(sbi) &&
> + if (!is_idle(sbi, REQ_TIME) &&
> (!excess_dirty_nats(sbi) && !excess_dirty_nodes(sbi)))
> return;
>
> @@ -521,7 +521,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
> excess_prefree_segs(sbi) ||
> excess_dirty_nats(sbi) ||
> excess_dirty_nodes(sbi) ||
> - f2fs_time_over(sbi, CP_TIME)) {
> + f2fs_time_over_cp(sbi)) {
> if (test_opt(sbi, DATA_FLUSH)) {
> struct blk_plug plug;
>
> @@ -1311,7 +1311,7 @@ static unsigned int __issue_discard_cmd_orderly(struct f2fs_sb_info *sbi,
> if (dc->state != D_PREP)
> goto next;
>
> - if (dpolicy->io_aware && !is_idle(sbi)) {
> + if (dpolicy->io_aware && !is_idle(sbi, DISCARD_TIME)) {
> io_interrupted = true;
> break;
> }
> @@ -1371,7 +1371,7 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi,
> f2fs_bug_on(sbi, dc->state != D_PREP);
>
> if (dpolicy->io_aware && i < dpolicy->io_aware_gran &&
> - !is_idle(sbi)) {
> + !is_idle(sbi, DISCARD_TIME)) {
> io_interrupted = true;
> break;
> }
> @@ -1564,8 +1564,6 @@ static int issue_discard_thread(void *data)
> struct discard_policy dpolicy;
> unsigned int wait_ms = DEF_MIN_DISCARD_ISSUE_TIME;
> int issued;
> - unsigned long interval = sbi->interval_time[REQ_TIME] * HZ;
> - long delta;
>
> set_freezable();
>
> @@ -1602,10 +1600,8 @@ static int issue_discard_thread(void *data)
> __wait_all_discard_cmd(sbi, &dpolicy);
> wait_ms = dpolicy.min_interval;
> } else if (issued == -1){
> - delta = (sbi->last_time[REQ_TIME] + interval) - jiffies;
> - if (delta > 0)
> - wait_ms = jiffies_to_msecs(delta);
> - else
> + wait_ms = f2fs_get_wait_time(sbi, DISCARD_TIME);
> + if (!wait_ms)
> wait_ms = dpolicy.mid_interval;
> } else {
> wait_ms = dpolicy.max_interval;
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 896b885..1706f45 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -2423,6 +2423,8 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
> sbi->dir_level = DEF_DIR_LEVEL;
> sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
> sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL;
> + sbi->interval_time[DISCARD_TIME] = DEF_IDLE_INTERVAL;
> + sbi->interval_time[GC_TIME] = DEF_IDLE_INTERVAL;
> clear_sbi_flag(sbi, SBI_NEED_FSCK);
>
> for (i = 0; i < NR_COUNT_TYPE; i++)
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 81c0e53..0afe99c 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -407,6 +407,9 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
> +F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, discard_idle_interval,
> + interval_time[DISCARD_TIME]);
> +F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_idle_interval, interval_time[GC_TIME]);
> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, readdir_ra, readdir_ra);
> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_pin_file_thresh, gc_pin_file_threshold);
> @@ -460,6 +463,8 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
> ATTR_LIST(dirty_nats_ratio),
> ATTR_LIST(cp_interval),
> ATTR_LIST(idle_interval),
> + ATTR_LIST(discard_idle_interval),
> + ATTR_LIST(gc_idle_interval),
> ATTR_LIST(iostat_enable),
> ATTR_LIST(readdir_ra),
> ATTR_LIST(gc_pin_file_thresh),
>
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