Hi Yunlei,
I also removed "segno = NULL_SEGNO;" in the beginning part near gc_more.
Thanks,
On 02/17, Yunlei He wrote:
> In FG_GC process, it will search victim section twice. This will
> cause some dirty section with less valid blocks skip garbage
> collection.
>
> section # 26425 : valid blocks # 3
> 142.037567: get_victim_by_default: victim 26425 : valid blocks # 3
> 142.037585: f2fs_get_victim: dev = (259,30), type = No TYPE, policy =
> (Foreground GC, LFS-mode, Greedy), victim = 26425 ofs_unit = 1,
> pre_victim_secno = 26425, prefree = 0, free = 244
> 142.039494: f2fs_get_victim: dev = (259,30), type = Hot DATA, policy =
> (Background GC, SSR-mode, Greedy), victim = 19022 ofs_unit = 1,
> pre_victim_secno = 26425, prefree = 0, free = 24
> 142.070247: new_curseg: Debug: alloc new segment 26746
> 142.244341: f2fs_get_victim: dev = (259,30), type = No TYPE, policy =
> (Foreground GC, LFS-mode, Greedy), victim = 26054 ofs_unit = 1,
> pre_victim_secno = 26054, prefree = 0, free = 243
> 142.254475: do_garbage_collect: Debug: FG_GC, seg_freed = 1
> 142.293131: f2fs_get_victim: dev = (259,30), type = Warm DATA, policy =
> (Background GC, SSR-mode, Greedy), victim = 23466 ofs_unit = 1,
> pre_victim_secno = -1, prefree = 0, free = 244
> 142.319001: f2fs_get_victim: dev = (259,30), type = Warm DATA, policy =
> (Background GC, SSR-mode, Greedy), victim = 23467 ofs_unit = 1,
> pre_victim_secno = -1, prefree = 0, free = 244
> 142.368879: get_victim_by_default: victim 26425 : valid blocks # 3
> 142.368894: f2fs_get_victim: dev = (259,30), type = No TYPE, policy =
> (Foreground GC, LFS-mode, Greedy), victim = 26425 ofs_unit = 1,
> pre_victim_secno = 26425, prefree = 0, free = 244
> 142.378127: f2fs_get_victim: dev = (259,30), type = Hot DATA, policy =
> (Background GC, SSR-mode, Greedy), victim = 19612 ofs_unit = 1,
> pre_victim_secno = 26425, prefree = 0, free = 24
> 142.416917: new_curseg: Debug: alloc new segment 26054
> 142.656794: f2fs_get_victim: dev = (259,30), type = No TYPE, policy =
> (Foreground GC, LFS-mode, Greedy), victim = 25404 ofs_unit = 1,
> pre_victim_secno = 25404, prefree = 0, free = 243
> 142.662139: do_garbage_collect: Debug: FG_GC, seg_freed = 1
> 142.684159: new_curseg: Debug: alloc new segment 25197
> 142.685059: get_victim_by_default: victim 26425 : valid blocks # 3
> 142.685079: f2fs_get_victim: dev = (259,30), type = No TYPE, policy =
> (Foreground GC, LFS-mode, Greedy), victim = 26425 ofs_unit = 1,
> pre_victim_secno = 26425, prefree = 0, free = 243
> 142.701427: f2fs_get_victim: dev = (259,30), type = No TYPE, policy =
> (Foreground GC, LFS-mode, Greedy), victim = 26238 ofs_unit = 1,
> pre_victim_secno = 26238, prefree = 0, free = 243
> 142.707105: do_garbage_collect: Debug: FG_GC, seg_freed = 1
> 142.802444: f2fs_get_victim: dev = (259,30), type = Warm DATA, policy =
> (Background GC, SSR-mode, Greedy), victim = 23473 ofs_unit = 1,
> pre_victim_secno = -1, prefree = 0, free = 244
> 142.804422: get_victim_by_default: victim 26425 : valid blocks # 3
> 142.804443: f2fs_get_victim: dev = (259,30), type = No TYPE, policy =
> (Foreground GC, LFS-mode, Greedy), victim = 26425 ofs_unit = 1,
> pre_victim_secno = 26425, prefree = 0, free = 244
> 142.851567: f2fs_get_victim: dev = (259,30), type = Hot DATA, policy =
> (Background GC, SSR-mode, Greedy), victim = 19092 ofs_unit = 1,
> pre_victim_secno = 26425, prefree = 0, free = 24
> 142.865014: new_curseg: Debug: alloc new segment 26238
> 143.082245: f2fs_get_victim: dev = (259,30), type = No TYPE, policy =
> (Foreground GC, LFS-mode, Greedy), victim = 26307 ofs_unit = 1,
> pre_victim_secno = 26307, prefree = 0, free = 244
> 143.088252: do_garbage_collect: Debug: FG_GC, seg_freed = 1
> 143.128307: new_curseg: Debug: alloc new segment 25404
> 143.181846: get_victim_by_default: victim 26425 : valid blocks # 3
> 143.181872: f2fs_get_victim: dev = (259,30), type = No TYPE, policy =
> (Foreground GC, LFS-mode, Greedy), victim = 26425 ofs_unit = 1,
> pre_victim_secno = 26425, prefree = 0, free = 244
>
> Signed-off-by: Yunlei He <heyun...@huawei.com>
> ---
> fs/f2fs/gc.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 88e5e7b..74e1553 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -943,12 +943,10 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync, bool
> background)
> * enough free sections, we should flush dent/node blocks and do
> * garbage collections.
> */
> - if (__get_victim(sbi, &segno, gc_type) ||
> - prefree_segments(sbi)) {
> + if (dirty_segments(sbi) || prefree_segments(sbi)) {
> ret = write_checkpoint(sbi, &cpc);
> if (ret)
> goto stop;
> - segno = NULL_SEGNO;
> } else if (has_not_enough_free_secs(sbi, 0, 0)) {
> ret = write_checkpoint(sbi, &cpc);
> if (ret)
> @@ -959,7 +957,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync, bool
> background)
> goto stop;
> }
>
> - if (segno == NULL_SEGNO && !__get_victim(sbi, &segno, gc_type))
> + if (!__get_victim(sbi, &segno, gc_type))
> goto stop;
> ret = 0;
>
> --
> 2.10.1
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