On 2020/9/27 09:58, Gang He wrote:
> When we discard unused blocks on a mounted ocfs2 filesystem, fstrim
> handles each block goup with locking/unlocking global bitmap meta-file
> repeatedly. we should let fstrim thread take a break(if need) between
> unlock and lock, this will avoid the potential soft lockup problem,
> and also gives the upper applications more IO opportunities, these
> applications are not blocked for too long at writing files.
>
> Signed-off-by: Gang He <g...@suse.com>
It makes sense.
Reviewed-by: Joseph Qi <joseph...@linux.alibaba.com>
> ---
> fs/ocfs2/alloc.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
> index 4c1b90442d6f..2cf9321919b5 100644
> --- a/fs/ocfs2/alloc.c
> +++ b/fs/ocfs2/alloc.c
> @@ -7654,8 +7654,10 @@ int ocfs2_trim_mainbm(struct super_block *sb, struct
> fstrim_range *range)
> * main_bm related locks for avoiding the current IO starve, then go to
> * trim the next group
> */
> - if (ret >= 0 && group <= last_group)
> + if (ret >= 0 && group <= last_group) {
> + cond_resched();
> goto next_group;
> + }
> out:
> range->len = trimmed * sb->s_blocksize;
> return ret;
>
