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SubjectRe: [f2fs-dev] [PATCH 1/2] f2fs: do not select same victim right again
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On 2019/9/9 16:06, Jaegeuk Kim wrote:
> On 09/09, Chao Yu wrote:
>> On 2019/9/9 9:25, Jaegeuk Kim wrote:
>>> GC must avoid select the same victim again.
>>
>> Blocks in previous victim will occupy addition free segment, I doubt after this
>> change, FGGC may encounter out-of-free space issue more frequently.
>
> Hmm, actually this change seems wrong by sec_usage_check().
> We may be able to avoid this only in the suspicious loop?
>
> ---
> fs/f2fs/gc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index e88f98ddf396..5877bd729689 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -1326,7 +1326,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
> round++;
> }
>
> - if (gc_type == FG_GC)
> + if (gc_type == FG_GC && seg_freed)

That's original solution Sahitya provided to avoid infinite loop of GC, but I
suggest to find the root cause first, then we added .invalid_segmap for that
purpose.

Thanks,

> sbi->cur_victim_sec = NULL_SEGNO;
>
> if (sync)
>

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