linux-kernel - Re: [PATCH v2] f2fs: provide f2fs_balance_fs to __write_node

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Date:   Fri, 28 Jul 2017 09:20:13 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Yunlong Song <yunlong.song@...wei.com>
Cc:     chao@...nel.org, yuchao0@...wei.com, sylinux@....com,
        miaoxie@...wei.com, bintian.wang@...wei.com,
        linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] f2fs: provide f2fs_balance_fs to __write_node_page

Hi Yunlong,

On 07/27, Yunlong Song wrote:
> v1->v2, fix some dead lock problems under some heavy load test

So, does this patch resolve the previous GC problem?

Thanks,

> 
> On 2017/7/27 20:11, Yunlong Song wrote:
> > Let node writeback also do f2fs_balance_fs to ensure there are always enough free
> > segments.
> > 
> > Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
> > ---
> >   fs/f2fs/checkpoint.c |  2 +-
> >   fs/f2fs/f2fs.h       |  2 +-
> >   fs/f2fs/node.c       | 14 ++++++++------
> >   3 files changed, 10 insertions(+), 8 deletions(-)
> > 
> > diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> > index 5b876f6..3c84a25 100644
> > --- a/fs/f2fs/checkpoint.c
> > +++ b/fs/f2fs/checkpoint.c
> > @@ -1017,7 +1017,7 @@ static int block_operations(struct f2fs_sb_info *sbi)
> >   	if (get_pages(sbi, F2FS_DIRTY_NODES)) {
> >   		up_write(&sbi->node_write);
> > -		err = sync_node_pages(sbi, &wbc);
> > +		err = sync_node_pages(sbi, &wbc, false);
> >   		if (err) {
> >   			up_write(&sbi->node_change);
> >   			f2fs_unlock_all(sbi);
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index 94a88b2..f69051b 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -2293,7 +2293,7 @@ struct page *new_node_page(struct dnode_of_data *dn,
> >   void move_node_page(struct page *node_page, int gc_type);
> >   int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
> >   			struct writeback_control *wbc, bool atomic);
> > -int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc);
> > +int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc, bool need);
> >   void build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount);
> >   bool alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid);
> >   void alloc_nid_done(struct f2fs_sb_info *sbi, nid_t nid);
> > diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> > index d53fe62..210ec25 100644
> > --- a/fs/f2fs/node.c
> > +++ b/fs/f2fs/node.c
> > @@ -1326,7 +1326,7 @@ static struct page *last_fsync_dnode(struct f2fs_sb_info *sbi, nid_t ino)
> >   }
> >   static int __write_node_page(struct page *page, bool atomic, bool *submitted,
> > -				struct writeback_control *wbc)
> > +				struct writeback_control *wbc, bool need)
> >   {
> >   	struct f2fs_sb_info *sbi = F2FS_P_SB(page);
> >   	nid_t nid;
> > @@ -1387,6 +1387,8 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
> >   	}
> >   	unlock_page(page);
> > +	if (need)
> > +		f2fs_balance_fs(sbi, false);
> >   	if (unlikely(f2fs_cp_error(sbi))) {
> >   		f2fs_submit_merged_write(sbi, NODE);
> > @@ -1405,7 +1407,7 @@ static int __write_node_page(struct page *page, bool atomic, bool *submitted,
> >   static int f2fs_write_node_page(struct page *page,
> >   				struct writeback_control *wbc)
> >   {
> > -	return __write_node_page(page, false, NULL, wbc);
> > +	return __write_node_page(page, false, NULL, wbc, false);
> >   }
> >   int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
> > @@ -1493,7 +1495,7 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
> >   			ret = __write_node_page(page, atomic &&
> >   						page == last_page,
> > -						&submitted, wbc);
> > +						&submitted, wbc, true);
> >   			if (ret) {
> >   				unlock_page(page);
> >   				f2fs_put_page(last_page, 0);
> > @@ -1530,7 +1532,7 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
> >   	return ret ? -EIO: 0;
> >   }
> > -int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc)
> > +int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc, bool need)
> >   {
> >   	pgoff_t index, end;
> >   	struct pagevec pvec;
> > @@ -1608,7 +1610,7 @@ int sync_node_pages(struct f2fs_sb_info *sbi, struct writeback_control *wbc)
> >   			set_fsync_mark(page, 0);
> >   			set_dentry_mark(page, 0);
> > -			ret = __write_node_page(page, false, &submitted, wbc);
> > +			ret = __write_node_page(page, false, &submitted, wbc, need);
> >   			if (ret)
> >   				unlock_page(page);
> >   			else if (submitted)
> > @@ -1697,7 +1699,7 @@ static int f2fs_write_node_pages(struct address_space *mapping,
> >   	diff = nr_pages_to_write(sbi, NODE, wbc);
> >   	wbc->sync_mode = WB_SYNC_NONE;
> >   	blk_start_plug(&plug);
> > -	sync_node_pages(sbi, wbc);
> > +	sync_node_pages(sbi, wbc, true);
> >   	blk_finish_plug(&plug);
> >   	wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
> >   	return 0;
> 
> -- 
> Thanks,
> Yunlong Song
>