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SubjectRe: [PATCH 2/2] f2fs: let checkpoint flush dnode page of regular
On 07/03, Chao Yu wrote:
> Fsyncer will wait on all dnode pages of regular writeback before flushing,
> if there are async dnode pages blocked by IO scheduler, it may decrease
> fsync's performance.

So, it'd be better to keep tracking what we really need to wait for first.

>
> In this patch, we choose to let f2fs_balance_fs_bg() to trigger checkpoint
> to flush these dnode pages of regular, so async IO of dnode page can be
> elimitnated, making fsyncer only need to wait for sync IO.
>
> Signed-off-by: Chao Yu <yuchao0@huawei.com>
> ---
> fs/f2fs/node.c | 8 +++++++-
> fs/f2fs/node.h | 5 +++++
> fs/f2fs/segment.c | 4 +++-
> 3 files changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index 0810c8117d46..eeee582cee32 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -1384,6 +1384,10 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
> if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
> goto redirty_out;
>
> + if (wbc->sync_mode == WB_SYNC_NONE &&
> + IS_DNODE(page) && is_cold_node(page))
> + goto redirty_out;
> +
> /* get old block addr of this node page */
> nid = nid_of_node(page);
> f2fs_bug_on(sbi, page->index != nid);
> @@ -1698,10 +1702,12 @@ int f2fs_sync_node_pages(struct f2fs_sb_info *sbi,
> }
>
> if (step < 2) {
> + if (wbc->sync_mode == WB_SYNC_NONE && step == 1)
> + goto out;
> step++;
> goto next_step;
> }
> -
> +out:
> if (nwritten)
> f2fs_submit_merged_write(sbi, NODE);
>
> diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
> index b95e49e4a928..b0da4c26eebb 100644
> --- a/fs/f2fs/node.h
> +++ b/fs/f2fs/node.h
> @@ -135,6 +135,11 @@ static inline bool excess_cached_nats(struct f2fs_sb_info *sbi)
> return NM_I(sbi)->nat_cnt >= DEF_NAT_CACHE_THRESHOLD;
> }
>
> +static inline bool excess_dirty_nodes(struct f2fs_sb_info *sbi)
> +{
> + return get_pages(sbi, F2FS_DIRTY_NODES) >= sbi->blocks_per_seg * 8;
> +}
> +
> enum mem_type {
> FREE_NIDS, /* indicates the free nid list */
> NAT_ENTRIES, /* indicates the cached nat entry */
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index bbe6e1596611..13f5e3665bf0 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -503,7 +503,8 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
> else
> f2fs_build_free_nids(sbi, false, false);
>
> - if (!is_idle(sbi) && !excess_dirty_nats(sbi))
> + if (!is_idle(sbi) &&
> + (!excess_dirty_nats(sbi) && !excess_dirty_nodes(sbi)))
> return;
>
> /* checkpoint is the only way to shrink partial cached entries */
> @@ -511,6 +512,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
> !f2fs_available_free_memory(sbi, INO_ENTRIES) ||
> excess_prefree_segs(sbi) ||
> excess_dirty_nats(sbi) ||
> + excess_dirty_nodes(sbi) ||
> f2fs_time_over(sbi, CP_TIME)) {
> if (test_opt(sbi, DATA_FLUSH)) {
> struct blk_plug plug;
> --
> 2.18.0.rc1

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