On Sat 20-04-13 15:46:58, Ted Tso wrote:
> As Dave Chinner pointed out at the 2013 LSF/MM workshop, it's
> important that metadata I/O requests are marked as such to avoid
> priority inversions caused by I/O bandwidth throttling.
OK, but then you also need this for all the journal & checkpoint IO from
JBD2 don't you?
Honza
>
> Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
> ---
> fs/ext4/balloc.c | 2 +-
> fs/ext4/ialloc.c | 2 +-
> fs/ext4/mmp.c | 4 ++--
> fs/ext4/super.c | 2 +-
> 4 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
> index 8dcaea6..d0f13ea 100644
> --- a/fs/ext4/balloc.c
> +++ b/fs/ext4/balloc.c
> @@ -441,7 +441,7 @@ ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group)
> trace_ext4_read_block_bitmap_load(sb, block_group);
> bh->b_end_io = ext4_end_bitmap_read;
> get_bh(bh);
> - submit_bh(READ, bh);
> + submit_bh(READ | REQ_META | REQ_PRIO, bh);
> return bh;
> verify:
> ext4_validate_block_bitmap(sb, desc, block_group, bh);
> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
> index 18d36d8..00a818d 100644
> --- a/fs/ext4/ialloc.c
> +++ b/fs/ext4/ialloc.c
> @@ -166,7 +166,7 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
> trace_ext4_load_inode_bitmap(sb, block_group);
> bh->b_end_io = ext4_end_bitmap_read;
> get_bh(bh);
> - submit_bh(READ, bh);
> + submit_bh(READ | REQ_META | REQ_PRIO, bh);
> wait_on_buffer(bh);
> if (!buffer_uptodate(bh)) {
> put_bh(bh);
> diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
> index b3b1f7d..214461e 100644
> --- a/fs/ext4/mmp.c
> +++ b/fs/ext4/mmp.c
> @@ -54,7 +54,7 @@ static int write_mmp_block(struct super_block *sb, struct buffer_head *bh)
> lock_buffer(bh);
> bh->b_end_io = end_buffer_write_sync;
> get_bh(bh);
> - submit_bh(WRITE_SYNC, bh);
> + submit_bh(WRITE_SYNC | REQ_META | REQ_PRIO, bh);
> wait_on_buffer(bh);
> sb_end_write(sb);
> if (unlikely(!buffer_uptodate(bh)))
> @@ -86,7 +86,7 @@ static int read_mmp_block(struct super_block *sb, struct buffer_head **bh,
> get_bh(*bh);
> lock_buffer(*bh);
> (*bh)->b_end_io = end_buffer_read_sync;
> - submit_bh(READ_SYNC, *bh);
> + submit_bh(READ_SYNC | REQ_META | REQ_PRIO, *bh);
> wait_on_buffer(*bh);
> if (!buffer_uptodate(*bh)) {
> brelse(*bh);
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index bfa29ec..dbc7c09 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -4252,7 +4252,7 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
> goto out_bdev;
> }
> journal->j_private = sb;
> - ll_rw_block(READ, 1, &journal->j_sb_buffer);
> + ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
> wait_on_buffer(journal->j_sb_buffer);
> if (!buffer_uptodate(journal->j_sb_buffer)) {
> ext4_msg(sb, KERN_ERR, "I/O error on journal device");
> --
> 1.7.12.rc0.22.gcdd159b
>
> --
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--
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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