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Date: Thu, 13 Jul 2017 17:58:32 +0200
From: Jan Kara <jack@...e.cz>
To: Eric Whitney <enwlinux@...il.com>
Cc: linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH] ext4: remove unused metadata accounting variables
On Thu 13-07-17 10:57:08, Eric Whitney wrote:
> Two variables in ext4_inode_info, i_reserved_meta_blocks and
> i_allocated_meta_blocks, are unused. Removing them saves a little
> memory per in-memory inode and cleans up clutter in several tracepoints.
> Adjust tracepoint output from ext4_alloc_da_blocks() for consistency
> and fix a typo and whitespace near these changes.
>
> Signed-off-by: Eric Whitney <enwlinux@...il.com>
Looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> fs/ext4/ext4.h | 6 ++----
> fs/ext4/super.c | 2 --
> include/trace/events/ext4.h | 35 ++++++++---------------------------
> 3 files changed, 10 insertions(+), 33 deletions(-)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 9ebde0c..dcbcd9d 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -961,7 +961,7 @@ struct ext4_inode_info {
> /*
> * i_block_group is the number of the block group which contains
> * this file's inode. Constant across the lifetime of the inode,
> - * it is ued for making block allocation decisions - we try to
> + * it is used for making block allocation decisions - we try to
> * place a file's data blocks near its inode block, and new inodes
> * near to their parent directory's inode.
> */
> @@ -1049,10 +1049,8 @@ struct ext4_inode_info {
> ext4_group_t i_last_alloc_group;
>
> /* allocation reservation info for delalloc */
> - /* In case of bigalloc, these refer to clusters rather than blocks */
> + /* In case of bigalloc, this refer to clusters rather than blocks */
> unsigned int i_reserved_data_blocks;
> - unsigned int i_reserved_meta_blocks;
> - unsigned int i_allocated_meta_blocks;
> ext4_lblk_t i_da_metadata_calc_last_lblock;
> int i_da_metadata_calc_len;
>
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index f666042..94722df 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -978,8 +978,6 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
> ei->i_es_shk_nr = 0;
> ei->i_es_shrink_lblk = 0;
> ei->i_reserved_data_blocks = 0;
> - ei->i_reserved_meta_blocks = 0;
> - ei->i_allocated_meta_blocks = 0;
> ei->i_da_metadata_calc_len = 0;
> ei->i_da_metadata_calc_last_lblock = 0;
> spin_lock_init(&(ei->i_block_reservation_lock));
> diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
> index dfae175..9c3bc38 100644
> --- a/include/trace/events/ext4.h
> +++ b/include/trace/events/ext4.h
> @@ -937,21 +937,19 @@ TRACE_EVENT(ext4_alloc_da_blocks,
> TP_STRUCT__entry(
> __field( dev_t, dev )
> __field( ino_t, ino )
> - __field( unsigned int, data_blocks )
> - __field( unsigned int, meta_blocks )
> + __field( unsigned int, data_blocks )
> ),
>
> TP_fast_assign(
> __entry->dev = inode->i_sb->s_dev;
> __entry->ino = inode->i_ino;
> __entry->data_blocks = EXT4_I(inode)->i_reserved_data_blocks;
> - __entry->meta_blocks = EXT4_I(inode)->i_reserved_meta_blocks;
> ),
>
> - TP_printk("dev %d,%d ino %lu data_blocks %u meta_blocks %u",
> + TP_printk("dev %d,%d ino %lu reserved_data_blocks %u",
> MAJOR(__entry->dev), MINOR(__entry->dev),
> (unsigned long) __entry->ino,
> - __entry->data_blocks, __entry->meta_blocks)
> + __entry->data_blocks)
> );
>
> TRACE_EVENT(ext4_mballoc_alloc,
> @@ -1153,8 +1151,6 @@ TRACE_EVENT(ext4_da_update_reserve_space,
> __field( __u64, i_blocks )
> __field( int, used_blocks )
> __field( int, reserved_data_blocks )
> - __field( int, reserved_meta_blocks )
> - __field( int, allocated_meta_blocks )
> __field( int, quota_claim )
> __field( __u16, mode )
> ),
> @@ -1166,22 +1162,16 @@ TRACE_EVENT(ext4_da_update_reserve_space,
> __entry->used_blocks = used_blocks;
> __entry->reserved_data_blocks =
> EXT4_I(inode)->i_reserved_data_blocks;
> - __entry->reserved_meta_blocks =
> - EXT4_I(inode)->i_reserved_meta_blocks;
> - __entry->allocated_meta_blocks =
> - EXT4_I(inode)->i_allocated_meta_blocks;
> __entry->quota_claim = quota_claim;
> __entry->mode = inode->i_mode;
> ),
>
> TP_printk("dev %d,%d ino %lu mode 0%o i_blocks %llu used_blocks %d "
> - "reserved_data_blocks %d reserved_meta_blocks %d "
> - "allocated_meta_blocks %d quota_claim %d",
> + "reserved_data_blocks %d quota_claim %d",
> MAJOR(__entry->dev), MINOR(__entry->dev),
> (unsigned long) __entry->ino,
> __entry->mode, __entry->i_blocks,
> __entry->used_blocks, __entry->reserved_data_blocks,
> - __entry->reserved_meta_blocks, __entry->allocated_meta_blocks,
> __entry->quota_claim)
> );
>
> @@ -1195,7 +1185,6 @@ TRACE_EVENT(ext4_da_reserve_space,
> __field( ino_t, ino )
> __field( __u64, i_blocks )
> __field( int, reserved_data_blocks )
> - __field( int, reserved_meta_blocks )
> __field( __u16, mode )
> ),
>
> @@ -1204,17 +1193,15 @@ TRACE_EVENT(ext4_da_reserve_space,
> __entry->ino = inode->i_ino;
> __entry->i_blocks = inode->i_blocks;
> __entry->reserved_data_blocks = EXT4_I(inode)->i_reserved_data_blocks;
> - __entry->reserved_meta_blocks = EXT4_I(inode)->i_reserved_meta_blocks;
> __entry->mode = inode->i_mode;
> ),
>
> TP_printk("dev %d,%d ino %lu mode 0%o i_blocks %llu "
> - "reserved_data_blocks %d reserved_meta_blocks %d",
> + "reserved_data_blocks %d",
> MAJOR(__entry->dev), MINOR(__entry->dev),
> (unsigned long) __entry->ino,
> __entry->mode, __entry->i_blocks,
> - __entry->reserved_data_blocks,
> - __entry->reserved_meta_blocks)
> + __entry->reserved_data_blocks)
> );
>
> TRACE_EVENT(ext4_da_release_space,
> @@ -1228,8 +1215,6 @@ TRACE_EVENT(ext4_da_release_space,
> __field( __u64, i_blocks )
> __field( int, freed_blocks )
> __field( int, reserved_data_blocks )
> - __field( int, reserved_meta_blocks )
> - __field( int, allocated_meta_blocks )
> __field( __u16, mode )
> ),
>
> @@ -1239,19 +1224,15 @@ TRACE_EVENT(ext4_da_release_space,
> __entry->i_blocks = inode->i_blocks;
> __entry->freed_blocks = freed_blocks;
> __entry->reserved_data_blocks = EXT4_I(inode)->i_reserved_data_blocks;
> - __entry->reserved_meta_blocks = EXT4_I(inode)->i_reserved_meta_blocks;
> - __entry->allocated_meta_blocks = EXT4_I(inode)->i_allocated_meta_blocks;
> __entry->mode = inode->i_mode;
> ),
>
> TP_printk("dev %d,%d ino %lu mode 0%o i_blocks %llu freed_blocks %d "
> - "reserved_data_blocks %d reserved_meta_blocks %d "
> - "allocated_meta_blocks %d",
> + "reserved_data_blocks %d",
> MAJOR(__entry->dev), MINOR(__entry->dev),
> (unsigned long) __entry->ino,
> __entry->mode, __entry->i_blocks,
> - __entry->freed_blocks, __entry->reserved_data_blocks,
> - __entry->reserved_meta_blocks, __entry->allocated_meta_blocks)
> + __entry->freed_blocks, __entry->reserved_data_blocks)
> );
>
> DECLARE_EVENT_CLASS(ext4__bitmap_load,
> --
> 2.1.4
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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