Hi Jaegeuk, > -----Original Message----- > From: Jaegeuk Kim [mailto:jaegeuk@xxxxxxxxxx] > Sent: Wednesday, January 27, 2016 2:48 AM > To: Chao Yu > Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-fsdevel@xxxxxxxxxxxxxxx; > linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx > Subject: Re: [f2fs-dev] [PATCH 4/6] f2fs: avoid multiple node page writes due to inline_data > > Hi Chao, > > On Tue, Jan 26, 2016 at 01:41:05PM +0800, Chao Yu wrote: > > Hi Jaegeuk, > > > > > -----Original Message----- > > > From: Jaegeuk Kim [mailto:jaegeuk@xxxxxxxxxx] > > > Sent: Tuesday, January 26, 2016 6:05 AM > > > To: linux-kernel@xxxxxxxxxxxxxxx; linux-fsdevel@xxxxxxxxxxxxxxx; > > > linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx > > > Cc: Jaegeuk Kim > > > Subject: [f2fs-dev] [PATCH 4/6] f2fs: avoid multiple node page writes due to inline_data > > > > > > The sceanrio is: > > > 1. create fully node blocks > > > 2. flush node blocks > > > 3. write inline_data for all the node blocks again > > > 4. flush node blocks redundantly > > > > > > So, this patch tries to flush inline_data when flushing node blocks. > > > > > > Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx> > > > --- > > > fs/f2fs/data.c | 1 + > > > fs/f2fs/inline.c | 2 ++ > > > fs/f2fs/node.c | 39 +++++++++++++++++++++++++++++++++++++++ > > > fs/f2fs/node.h | 15 +++++++++++++++ > > > 4 files changed, 57 insertions(+) > > > > > > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c > > > index 89a37ba..260c0eb 100644 > > > --- a/fs/f2fs/data.c > > > +++ b/fs/f2fs/data.c > > > @@ -1463,6 +1463,7 @@ restart: > > > if (pos + len <= MAX_INLINE_DATA) { > > > read_inline_data(page, ipage); > > > set_inode_flag(F2FS_I(inode), FI_DATA_EXIST); > > > + set_inline_node(ipage); > > > sync_inode_page(&dn); > > > } else { > > > err = f2fs_convert_inline_page(&dn, page); > > > diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c > > > index 8df13e5..fc4d298 100644 > > > --- a/fs/f2fs/inline.c > > > +++ b/fs/f2fs/inline.c > > > @@ -159,6 +159,7 @@ no_update: > > > > > > /* clear inline data and flag after data writeback */ > > > truncate_inline_inode(dn->inode_page, 0); > > > + clear_inline_node(dn->inode_page); > > > clear_out: > > > stat_dec_inline_inode(dn->inode); > > > f2fs_clear_inline_inode(dn->inode); > > > @@ -233,6 +234,7 @@ int f2fs_write_inline_data(struct inode *inode, struct page *page) > > > set_inode_flag(F2FS_I(inode), FI_DATA_EXIST); > > > > > > sync_inode_page(&dn); > > > + clear_inline_node(dn.inode_page); > > > f2fs_put_dnode(&dn); > > > return 0; > > > } > > > diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c > > > index 23b800d..94a6755 100644 > > > --- a/fs/f2fs/node.c > > > +++ b/fs/f2fs/node.c > > > @@ -1154,6 +1154,37 @@ void sync_inode_page(struct dnode_of_data *dn) > > > dn->node_changed = ret ? true: false; > > > } > > > > > > +static void flush_inline_data(struct f2fs_sb_info *sbi, nid_t ino) > > > +{ > > > + struct inode *inode; > > > + struct page *page; > > > + > > > + /* should flush inline_data before evict_inode */ > > > + inode = ilookup(sbi->sb, ino); > > > + if (!inode) > > > + return; > > > + > > > + page = pagecache_get_page(inode->i_mapping, 0, FGP_LOCK|FGP_NOWAIT, 0); > > > + if (!page) > > > + goto iput_out; > > > + > > > + if (!PageUptodate(page)) > > > + goto page_out; > > > + > > > + if (!PageDirty(page)) > > > + goto page_out; > > > + > > > + if (!clear_page_dirty_for_io(page)) > > > + goto page_out; > > > + > > > + if (!f2fs_write_inline_data(inode, page)) > > > > better to redirty the page when fail except -EAGAIN? > > Agreed. > > > > > > + inode_dec_dirty_pages(inode); > > > +page_out: > > > + f2fs_put_page(page, 1); > > > +iput_out: > > > + iput(inode); > > > +} > > > + > > > int sync_node_pages(struct f2fs_sb_info *sbi, nid_t ino, > > > struct writeback_control *wbc) > > > { > > > @@ -1221,6 +1252,14 @@ continue_unlock: > > > goto continue_unlock; > > > } > > > > > > + /* flush inline_data */ > > > + if (!ino && is_inline_node(page)) { > > > + clear_inline_node(page); > > > > Should clear after flushed inline data? otherwise if we failed to flush > > inline data, we will lose the change to flush it before node flush. > > My intention was just letting it go and flush by ->writepage later. Hmm.. since it's rare scenario, so it's OK to me. > So, the above set_page_dirty() would handle this, right? Yes. Please add Reviewed-by: Chao Yu <chao2.yu@xxxxxxxxxxx> Thanks, > > Thanks, > > > > > Thanks, > > > > > + unlock_page(page); > > > + flush_inline_data(sbi, ino_of_node(page)); > > > + continue; > > > + } > > > + > > > if (!clear_page_dirty_for_io(page)) > > > goto continue_unlock; > > > > > > diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h > > > index 23bd992..1f4f9d4 100644 > > > --- a/fs/f2fs/node.h > > > +++ b/fs/f2fs/node.h > > > @@ -379,6 +379,21 @@ static inline int is_node(struct page *page, int type) > > > #define is_fsync_dnode(page) is_node(page, FSYNC_BIT_SHIFT) > > > #define is_dent_dnode(page) is_node(page, DENT_BIT_SHIFT) > > > > > > +static inline int is_inline_node(struct page *page) > > > +{ > > > + return PageChecked(page); > > > +} > > > + > > > +static inline void set_inline_node(struct page *page) > > > +{ > > > + SetPageChecked(page); > > > +} > > > + > > > +static inline void clear_inline_node(struct page *page) > > > +{ > > > + ClearPageChecked(page); > > > +} > > > + > > > static inline void set_cold_node(struct inode *inode, struct page *page) > > > { > > > struct f2fs_node *rn = F2FS_NODE(page); > > > -- > > > 2.6.3 > > > > > > > > > ------------------------------------------------------------------------------ > > > Site24x7 APM Insight: Get Deep Visibility into Application Performance > > > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > > > Monitor end-to-end web transactions and take corrective actions now > > > Troubleshoot faster and improve end-user experience. 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