Re: [f2fs-dev] [PATCH 2/5] f2fs: introduce f2fs_gc_control to consolidate f2fs_gc parameters

From: Jaegeuk Kim
Date: Mon May 09 2022 - 12:46:26 EST

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In reply to: Chao Yu: "Re: [f2fs-dev] [PATCH 2/5] f2fs: introduce f2fs_gc_control to consolidate f2fs_gc parameters"
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On 05/08, Chao Yu wrote:
> On 2022/5/7 7:20, Jaegeuk Kim wrote:
> > No functional change.
> >
> > Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
> > ---
> > fs/f2fs/f2fs.h | 11 +++++++++--
> > fs/f2fs/file.c | 30 +++++++++++++++++++++++++-----
> > fs/f2fs/gc.c | 29 ++++++++++++++++++-----------
> > fs/f2fs/segment.c | 8 +++++++-
> > fs/f2fs/super.c | 8 +++++++-
> > include/trace/events/f2fs.h | 18 +++++++++---------
> > 6 files changed, 75 insertions(+), 29 deletions(-)
> >
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index efe5e80163a8..d49b9b476592 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -1276,6 +1276,14 @@ struct atgc_management {
> > unsigned long long age_threshold; /* age threshold */
> > };
> > +struct f2fs_gc_control {
> > + unsigned int victim_segno; /* target victim segment number */
> > + int init_gc_type; /* FG_GC or BG_GC */
> > + bool no_bg_gc; /* check the space and stop bg_gc */
> > + bool should_migrate_blocks; /* should migrate blocks */
> > + bool err_gc_skipped; /* return EAGAIN if GC skipped */
> > +};
> > +
> > /* For s_flag in struct f2fs_sb_info */
> > enum {
> > SBI_IS_DIRTY, /* dirty flag for checkpoint */
> > @@ -3786,8 +3794,7 @@ extern const struct iomap_ops f2fs_iomap_ops;
> > int f2fs_start_gc_thread(struct f2fs_sb_info *sbi);
> > void f2fs_stop_gc_thread(struct f2fs_sb_info *sbi);
> > block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode);
> > -int f2fs_gc(struct f2fs_sb_info *sbi, bool sync, bool background, bool force,
> > - unsigned int segno);
> > +int f2fs_gc(struct f2fs_sb_info *sbi, struct f2fs_gc_control *gc_control);
> > void f2fs_build_gc_manager(struct f2fs_sb_info *sbi);
> > int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count);
> > int __init f2fs_create_garbage_collection_cache(void);
> > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > index b307d96a0a7c..0e7d101c3e65 100644
> > --- a/fs/f2fs/file.c
> > +++ b/fs/f2fs/file.c
> > @@ -1647,6 +1647,10 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
> > struct f2fs_map_blocks map = { .m_next_pgofs = NULL,
> > .m_next_extent = NULL, .m_seg_type = NO_CHECK_TYPE,
> > .m_may_create = true };
> > + struct f2fs_gc_control gc_control = { .victim_segno = NULL_SEGNO,
> > + .init_gc_type = FG_GC,
>
> .no_bg_gc will be printed by tracepoint, let's initialize it as well...
>
> .no_bg_gc = false,

I wanted to skip this, since it's "don't care" value for FG_GC. Let me fix
the tracepoint.

>
> > + .should_migrate_blocks = false,
> > + .err_gc_skipped = true };
> > pgoff_t pg_start, pg_end;
> > loff_t new_size = i_size_read(inode);
> > loff_t off_end;
> > @@ -1684,7 +1688,7 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
> > if (has_not_enough_free_secs(sbi, 0,
> > GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi)))) {
> > f2fs_down_write(&sbi->gc_lock);
> > - err = f2fs_gc(sbi, true, false, false, NULL_SEGNO);
> > + err = f2fs_gc(sbi, &gc_control);
> > if (err && err != -ENODATA)
> > goto out_err;
> > }
> > @@ -2447,6 +2451,9 @@ static int f2fs_ioc_gc(struct file *filp, unsigned long arg)
> > {
> > struct inode *inode = file_inode(filp);
> > struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > + struct f2fs_gc_control gc_control = { .victim_segno = NULL_SEGNO,
> > + .no_bg_gc = false,
> > + .should_migrate_blocks = false };
> > __u32 sync;
> > int ret;
> > @@ -2472,7 +2479,9 @@ static int f2fs_ioc_gc(struct file *filp, unsigned long arg)
> > f2fs_down_write(&sbi->gc_lock);
> > }
> > - ret = f2fs_gc(sbi, sync, true, false, NULL_SEGNO);
> > + gc_control.init_gc_type = sync ? FG_GC : BG_GC;
> > + gc_control.err_gc_skipped = sync;
> > + ret = f2fs_gc(sbi, &gc_control);
> > out:
> > mnt_drop_write_file(filp);
> > return ret;
> > @@ -2481,6 +2490,11 @@ static int f2fs_ioc_gc(struct file *filp, unsigned long arg)
> > static int __f2fs_ioc_gc_range(struct file *filp, struct f2fs_gc_range *range)
> > {
> > struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(filp));
> > + struct f2fs_gc_control gc_control = {
> > + .init_gc_type = range->sync ? FG_GC : BG_GC,
> > + .no_bg_gc = false,
> > + .should_migrate_blocks = false,
> > + .err_gc_skipped = range->sync };
> > u64 end;
> > int ret;
> > @@ -2508,8 +2522,8 @@ static int __f2fs_ioc_gc_range(struct file *filp, struct f2fs_gc_range *range)
> > f2fs_down_write(&sbi->gc_lock);
> > }
> > - ret = f2fs_gc(sbi, range->sync, true, false,
> > - GET_SEGNO(sbi, range->start));
> > + gc_control.victim_segno = GET_SEGNO(sbi, range->start);
> > + ret = f2fs_gc(sbi, &gc_control);
> > if (ret) {
> > if (ret == -EBUSY)
> > ret = -EAGAIN;
> > @@ -2923,6 +2937,10 @@ static int f2fs_ioc_flush_device(struct file *filp, unsigned long arg)
> > unsigned int start_segno = 0, end_segno = 0;
> > unsigned int dev_start_segno = 0, dev_end_segno = 0;
> > struct f2fs_flush_device range;
> > + struct f2fs_gc_control gc_control = {
> > + .init_gc_type = FG_GC,
>
> .no_bg_gc = false,
>
> > + .should_migrate_blocks = true,
> > + .err_gc_skipped = true };
> > int ret;
> > if (!capable(CAP_SYS_ADMIN))
> > @@ -2966,7 +2984,9 @@ static int f2fs_ioc_flush_device(struct file *filp, unsigned long arg)
> > sm->last_victim[GC_CB] = end_segno + 1;
> > sm->last_victim[GC_GREEDY] = end_segno + 1;
> > sm->last_victim[ALLOC_NEXT] = end_segno + 1;
> > - ret = f2fs_gc(sbi, true, true, true, start_segno);
> > +
> > + gc_control.victim_segno = start_segno;
> > + ret = f2fs_gc(sbi, &gc_control);
> > if (ret == -EAGAIN)
> > ret = 0;
> > else if (ret < 0)
> > diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> > index 3009c0a97ab4..aeffcc1d5c02 100644
> > --- a/fs/f2fs/gc.c
> > +++ b/fs/f2fs/gc.c
> > @@ -35,6 +35,9 @@ static int gc_thread_func(void *data)
> > wait_queue_head_t *wq = &sbi->gc_thread->gc_wait_queue_head;
> > wait_queue_head_t *fggc_wq = &sbi->gc_thread->fggc_wq;
> > unsigned int wait_ms;
> > + struct f2fs_gc_control gc_control = {
> > + .victim_segno = NULL_SEGNO,
> > + .should_migrate_blocks = false };
> > wait_ms = gc_th->min_sleep_time;
> > @@ -141,8 +144,12 @@ static int gc_thread_func(void *data)
> > if (foreground)
> > sync_mode = false;
> > + gc_control.init_gc_type = sync_mode ? FG_GC : BG_GC;
> > + gc_control.no_bg_gc = foreground;
> > + gc_control.err_gc_skipped = sync_mode;
> > +
> > /* if return value is not zero, no victim was selected */
> > - if (f2fs_gc(sbi, sync_mode, !foreground, false, NULL_SEGNO))
> > + if (f2fs_gc(sbi, &gc_control))
> > wait_ms = gc_th->no_gc_sleep_time;
> > if (foreground)
> > @@ -1753,14 +1760,13 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
> > return seg_freed;
> > }
> > -int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
> > - bool background, bool force, unsigned int segno)
> > +int f2fs_gc(struct f2fs_sb_info *sbi, struct f2fs_gc_control *gc_control)
> > {
> > - int gc_type = sync ? FG_GC : BG_GC;
> > + int gc_type = gc_control->init_gc_type;
> > + unsigned int segno = gc_control->victim_segno;
> > int sec_freed = 0, seg_freed = 0, total_freed = 0;
> > int ret = 0;
> > struct cp_control cpc;
> > - unsigned int init_segno = segno;
> > struct gc_inode_list gc_list = {
> > .ilist = LIST_HEAD_INIT(gc_list.ilist),
> > .iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
> > @@ -1769,7 +1775,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
> > unsigned long long first_skipped;
> > unsigned int skipped_round = 0, round = 0;
> > - trace_f2fs_gc_begin(sbi->sb, sync, background,
> > + trace_f2fs_gc_begin(sbi->sb, gc_type, gc_control->no_bg_gc,
> > get_pages(sbi, F2FS_DIRTY_NODES),
> > get_pages(sbi, F2FS_DIRTY_DENTS),
> > get_pages(sbi, F2FS_DIRTY_IMETA),
> > @@ -1808,7 +1814,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
> > }
> > /* f2fs_balance_fs doesn't need to do BG_GC in critical path. */
> > - if (gc_type == BG_GC && !background) {
> > + if (gc_type == BG_GC && gc_control->no_bg_gc) {
> > ret = -EINVAL;
> > goto stop;
> > }
> > @@ -1824,7 +1830,8 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
> > goto stop;
> > }
> > - seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type, force);
> > + seg_freed = do_garbage_collect(sbi, segno, &gc_list, gc_type,
> > + gc_control->should_migrate_blocks);
> > if (gc_type == FG_GC &&
> > seg_freed == f2fs_usable_segs_in_sec(sbi, segno))
> > sec_freed++;
> > @@ -1841,7 +1848,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
> > if (gc_type == FG_GC)
> > sbi->cur_victim_sec = NULL_SEGNO;
> > - if (sync)
> > + if (gc_control->init_gc_type == FG_GC)
> > goto stop;
> > if (!has_not_enough_free_secs(sbi, sec_freed, 0))
> > @@ -1871,7 +1878,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
> > ret = f2fs_write_checkpoint(sbi, &cpc);
> > stop:
> > SIT_I(sbi)->last_victim[ALLOC_NEXT] = 0;
> > - SIT_I(sbi)->last_victim[FLUSH_DEVICE] = init_segno;
> > + SIT_I(sbi)->last_victim[FLUSH_DEVICE] = gc_control->victim_segno;
> > if (gc_type == FG_GC)
> > f2fs_unpin_all_sections(sbi, true);
> > @@ -1889,7 +1896,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
> > put_gc_inode(&gc_list);
> > - if (sync && !ret)
> > + if (gc_control->err_gc_skipped && !ret)
> > ret = sec_freed ? 0 : -EAGAIN;
> > return ret;
> > }
> > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> > index 87ff2b3cdf94..bc63f0572c64 100644
> > --- a/fs/f2fs/segment.c
> > +++ b/fs/f2fs/segment.c
> > @@ -523,8 +523,14 @@ void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need)
> > io_schedule();
> > finish_wait(&sbi->gc_thread->fggc_wq, &wait);
> > } else {
> > + struct f2fs_gc_control gc_control = {
> > + .victim_segno = NULL_SEGNO,
> > + .init_gc_type = BG_GC,
> > + .no_bg_gc = true,
> > + .should_migrate_blocks = false,
> > + .err_gc_skipped = false };
> > f2fs_down_write(&sbi->gc_lock);
> > - f2fs_gc(sbi, false, false, false, NULL_SEGNO);
> > + f2fs_gc(sbi, &gc_control);
> > }
> > }
> > }
> > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> > index 7edb018a60a6..8b23fa6fc6b7 100644
> > --- a/fs/f2fs/super.c
> > +++ b/fs/f2fs/super.c
> > @@ -2080,8 +2080,14 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
> > sbi->gc_mode = GC_URGENT_HIGH;
> > while (!f2fs_time_over(sbi, DISABLE_TIME)) {
> > + struct f2fs_gc_control gc_control = {
> > + .victim_segno = NULL_SEGNO,
> > + .init_gc_type = FG_GC,
>
> .no_bg_gc = false,
>
> Thanks,
>
> > + .should_migrate_blocks = false,
> > + .err_gc_skipped = true };
> > +
> > f2fs_down_write(&sbi->gc_lock);
> > - err = f2fs_gc(sbi, true, false, false, NULL_SEGNO);
> > + err = f2fs_gc(sbi, &gc_control);
> > if (err == -ENODATA) {
> > err = 0;
> > break;
> > diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
> > index 4d1ad64d4cab..6699174977a3 100644
> > --- a/include/trace/events/f2fs.h
> > +++ b/include/trace/events/f2fs.h
> > @@ -652,19 +652,19 @@ TRACE_EVENT(f2fs_background_gc,
> > TRACE_EVENT(f2fs_gc_begin,
> > - TP_PROTO(struct super_block *sb, bool sync, bool background,
> > + TP_PROTO(struct super_block *sb, int gc_type, bool no_bg_gc,
> > long long dirty_nodes, long long dirty_dents,
> > long long dirty_imeta, unsigned int free_sec,
> > unsigned int free_seg, int reserved_seg,
> > unsigned int prefree_seg),
> > - TP_ARGS(sb, sync, background, dirty_nodes, dirty_dents, dirty_imeta,
> > + TP_ARGS(sb, gc_type, no_bg_gc, dirty_nodes, dirty_dents, dirty_imeta,
> > free_sec, free_seg, reserved_seg, prefree_seg),
> > TP_STRUCT__entry(
> > __field(dev_t, dev)
> > - __field(bool, sync)
> > - __field(bool, background)
> > + __field(int, gc_type)
> > + __field(bool, no_bg_gc)
> > __field(long long, dirty_nodes)
> > __field(long long, dirty_dents)
> > __field(long long, dirty_imeta)
> > @@ -676,8 +676,8 @@ TRACE_EVENT(f2fs_gc_begin,
> > TP_fast_assign(
> > __entry->dev = sb->s_dev;
> > - __entry->sync = sync;
> > - __entry->background = background;
> > + __entry->gc_type = gc_type;
> > + __entry->no_bg_gc = no_bg_gc;
> > __entry->dirty_nodes = dirty_nodes;
> > __entry->dirty_dents = dirty_dents;
> > __entry->dirty_imeta = dirty_imeta;
> > @@ -687,12 +687,12 @@ TRACE_EVENT(f2fs_gc_begin,
> > __entry->prefree_seg = prefree_seg;
> > ),
> > - TP_printk("dev = (%d,%d), sync = %d, background = %d, nodes = %lld, "
> > + TP_printk("dev = (%d,%d), gc_type = %s, no_background_GC = %d, nodes = %lld, "
> > "dents = %lld, imeta = %lld, free_sec:%u, free_seg:%u, "
> > "rsv_seg:%d, prefree_seg:%u",
> > show_dev(__entry->dev),
> > - __entry->sync,
> > - __entry->background,
> > + show_gc_type(__entry->gc_type),
> > + __entry->no_bg_gc,
> > __entry->dirty_nodes,
> > __entry->dirty_dents,
> > __entry->dirty_imeta,

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