On 2017/7/16 9:04, Jaegeuk Kim wrote:
> Before retrying to flush data or dentry pages, we need to release cpu in order
> to prevent watchdog.
>
> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
> ---
> Change log from v1:
> - timeout more specifically
>
> fs/f2fs/checkpoint.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index 56bbf592e487..5b876f6d3f6b 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -879,6 +879,7 @@ int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
> struct inode *inode;
> struct f2fs_inode_info *fi;
> bool is_dir = (type == DIR_INODE);
> + unsigned long ino = 0;
>
> trace_f2fs_sync_dirty_inodes_enter(sbi->sb, is_dir,
> get_pages(sbi, is_dir ?
> @@ -901,8 +902,17 @@ int sync_dirty_inodes(struct f2fs_sb_info *sbi, enum inode_type type)
> inode = igrab(&fi->vfs_inode);
> spin_unlock(&sbi->inode_lock[type]);
> if (inode) {
> + unsigned long cur_ino = inode->i_ino;
> +
> filemap_fdatawrite(inode->i_mapping);
> iput(inode);
> + /* We need to give cpu to another writers. */
> + if (ino == cur_ino) {
We failed to flush dirty pages of inode due to encountering -EAGAIN of writepage?
Thanks,
> + congestion_wait(BLK_RW_ASYNC, HZ/50);
> + cond_resched();
> + } else {
> + ino = cur_ino;
> + }
> } else {
> /*
> * We should submit bio, since it exists several
>
