Re: [PATCH v3] f2fs: add new idle interval timing for discard and gc paths

From: Jaegeuk Kim
Date: Tue Sep 18 2018 - 12:39:59 EST

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On 09/18, Sahitya Tummala wrote:
> On Mon, Sep 17, 2018 at 06:30:39PM -0700, Jaegeuk Kim wrote:
> > On 09/17, Sahitya Tummala wrote:
> > > This helps to control the frequency of submission of discard and
> > > GC requests independently, based on the need.
> > >
> > > Suggested-by: Chao Yu <yuchao0@xxxxxxxxxx>
> > > Signed-off-by: Sahitya Tummala <stummala@xxxxxxxxxxxxxx>
> > > ---
> > > v3:
> > > -don't change gc thread wait_ms in this patch
> > > -Use the existing function f2fs_time_over() to handle this
> > > -change f2fs_get_wait_time() to f2fs_time_to_wait()
> > >
> > > Documentation/ABI/testing/sysfs-fs-f2fs | 17 ++++++++++++++++-
> > > fs/f2fs/f2fs.h | 28 +++++++++++++++++++++++++---
> > > fs/f2fs/gc.c | 2 +-
> > > fs/f2fs/segment.c | 14 +++++---------
> > > fs/f2fs/super.c | 2 ++
> > > fs/f2fs/sysfs.c | 5 +++++
> > > 6 files changed, 54 insertions(+), 14 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@xxxxxxxxxx>
> > > 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@xxxxxxxxxx>
> > > +Contact: "Sahitya Tummala" <stummala@xxxxxxxxxxxxxx>
> > > +Description:
> > > + Controls the idle timing for discard path.
> > > +
> > > +What: /sys/fs/f2fs/<disk>/gc_idle_interval
> > > +Date: September 2018
> > > +Contact: "Chao Yu" <yuchao0@xxxxxxxxxx>
> > > +Contact: "Sahitya Tummala" <stummala@xxxxxxxxxxxxxx>
> > > +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 88b8d50..41e00d3 100644
> > > --- a/fs/f2fs/f2fs.h
> > > +++ b/fs/f2fs/f2fs.h
> > > @@ -1095,6 +1095,8 @@ enum {
> > > enum {
> > > CP_TIME,
> > > REQ_TIME,
> > > + DISCARD_TIME,
> > > + GC_TIME,
> > > MAX_TIME,
> > > };
> > >
> > > @@ -1352,11 +1354,31 @@ static inline void f2fs_update_time(struct f2fs_sb_info *sbi, int type)
> > > static inline bool f2fs_time_over(struct f2fs_sb_info *sbi, int type)
> > > {
> > > unsigned long interval = sbi->interval_time[type] * HZ;
> > > + unsigned long last_time;
> > >
> > > - return time_after(jiffies, sbi->last_time[type] + interval);
> > > + if (type == CP_TIME)
> > > + last_time = sbi->last_time[CP_TIME];
> > > + else
> > > + last_time = sbi->last_time[REQ_TIME];
> >
> > Why can't we use just this?
> >
> > return time_after(jiffies, sbi->last_time[type] + interval);
> >
>
> There is no sbi_->last_time[discard_time] and sbi->last_time[gc_time]. Only
> sbi->interval_time[discard_time] and sbi->interval_time[gc_time] is defined to
> determine the idle interval time since the last request time, separately for
> these two paths.

If you add enums above, sbi will have last_time slots for DISCARD_TIME/GC_TIME.
Doesn't it make sense to add the below in f2fs_update_time(), if you want to
introduce two additional types?

/* DISCARD_TIME and GC_TIME are based on REQ_TIME */
if (type == REQ_TIME) {
sbi->last_time(DISCARD_TIME) = jiffies;
sbi->last_time(GC_TIME) = jiffies;
}

>
> > > +
> > > + return time_after(jiffies, last_time + interval);
> > > +}
> > > +
> > > +static inline unsigned int f2fs_time_to_wait(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;

Then, we can use *type* instead of REQ_TIME?

> > > + if (delta > 0)
> > > + wait_ms = jiffies_to_msecs(delta);
> > > +
> > > + 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);
> > > @@ -1365,7 +1387,7 @@ 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(sbi, type);
> > > }
> > >
> > > /*
> > > diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> > > index 5c8d004..49e2328 100644
> > > --- a/fs/f2fs/gc.c
> > > +++ b/fs/f2fs/gc.c
> > > @@ -83,7 +83,7 @@ static int gc_thread_func(void *data)
> > > if (!mutex_trylock(&sbi->gc_mutex))
> > > goto next;
> > >
> > > - if (!is_idle(sbi)) {
> > > + if (!is_idle(sbi, GC_TIME)) {
> > > 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 187c848..67cf7e4 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;
> > >
> > > @@ -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_time_to_wait(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 3106da1..2f67948 100644
> > > --- a/fs/f2fs/super.c
> > > +++ b/fs/f2fs/super.c
> > > @@ -2463,6 +2463,8 @@ 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),
> > > --
> > > Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc.
> > > Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
>
> --
> --
> Sent by a consultant of the Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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In reply to: Sahitya Tummala: "Re: [PATCH v3] f2fs: add new idle interval timing for discard and gc paths"
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