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SubjectRe: [f2fs-dev] [PATCH 06/11] f2fs: skip unnecessary data writes during fsync
On Tue, Jul 29, 2014 at 07:39:45PM +0800, Chao Yu wrote:
> Hi,
>
> > -----Original Message-----
> > From: Jaegeuk Kim [mailto:jaegeuk@kernel.org]
> > Sent: Saturday, July 26, 2014 6:47 AM
> > To: linux-kernel@vger.kernel.org; linux-fsdevel@vger.kernel.org;
> > linux-f2fs-devel@lists.sourceforge.net
> > Cc: Jaegeuk Kim
> > Subject: [f2fs-dev] [PATCH 06/11] f2fs: skip unnecessary data writes during fsync
> >
> > This patch intends to improve the fsync performance by skipping remaining the
> > recovery information, only when there is no data that we should recover.
> >
> > Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> > ---
> > fs/f2fs/file.c | 16 ++++++++++++++++
> > 1 file changed, 16 insertions(+)
> >
> > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > index 7c652b3..121689a 100644
> > --- a/fs/f2fs/file.c
> > +++ b/fs/f2fs/file.c
> > @@ -133,6 +133,17 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int
> > datasync)
> > return ret;
> > }
> >
> > + /*
> > + * if there is no written data, don't waste time to write recovery info.
> > + */
> > + if (!is_inode_flag_set(fi, FI_APPEND_WRITE) &&
> > + !exist_written_data(sbi, inode->i_ino, APPEND_INO)) {
> > + if (is_inode_flag_set(fi, FI_UPDATE_WRITE) &&
> > + exist_written_data(sbi, inode->i_ino, UPDATE_INO))
>
> Should we shift this to is_inode_flag_set(fi, FI_UPDATE_WRITE) ||
> exist_written_data(sbi, inode->i_ino, UPDATE_INO) ?

Hehe, I found that and was going to submit new patch. :)
Small changes are not a big deal, so I'll test and then push them into the tree.
The for-next tree can be rebased all the time, so if you have any suggestion,
let me know.

Thanks,

>
> > + goto flush_out;
> > + goto out;
> > + }
> > +
> > /* guarantee free sections for fsync */
> > f2fs_balance_fs(sbi);
> >
> > @@ -188,6 +199,11 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int
> > datasync)
> > ret = wait_on_node_pages_writeback(sbi, inode->i_ino);
> > if (ret)
> > goto out;
> > +
> > + /* once recovery info is written, don't need to tack this */
> > + remove_dirty_inode(sbi, inode->i_ino, APPEND_INO);
> > +flush_out:
> > + remove_dirty_inode(sbi, inode->i_ino, UPDATE_INO);
> > ret = f2fs_issue_flush(F2FS_SB(inode->i_sb));
> > }
> > out:
> > --
> > 1.8.5.2 (Apple Git-48)
> >
> >
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> > Linux-f2fs-devel mailing list
> > Linux-f2fs-devel@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel


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