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ext4: Add new tracepoints to debug delayed allocation space functions
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Add tracepoints for ext4_da_reserve_space(),
ext4_da_update_reserve_space(), and ext4_da_release_space().

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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Theodore Ts'o committed Jan 1, 2010
1 parent 71f2be2 commit f8ec9d6
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Showing 2 changed files with 103 additions and 0 deletions.
2 changes: 2 additions & 0 deletions fs/ext4/inode.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1061,6 +1061,7 @@ void ext4_da_update_reserve_space(struct inode *inode,
int mdb_free = 0, allocated_meta_blocks = 0;

spin_lock(&ei->i_block_reservation_lock);
trace_ext4_da_update_reserve_space(inode, used);
if (unlikely(used > ei->i_reserved_data_blocks)) {
ext4_msg(inode->i_sb, KERN_NOTICE, "%s: ino %lu, used %d "
"with only %d reserved data blocks\n",
Expand Down Expand Up @@ -1846,6 +1847,7 @@ static int ext4_da_reserve_space(struct inode *inode, sector_t lblock)
spin_lock(&ei->i_block_reservation_lock);
md_reserved = ei->i_reserved_meta_blocks;
md_needed = ext4_calc_metadata_amount(inode, lblock);
trace_ext4_da_reserve_space(inode, md_needed);
spin_unlock(&ei->i_block_reservation_lock);

/*
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101 changes: 101 additions & 0 deletions include/trace/events/ext4.h
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Original file line number Diff line number Diff line change
Expand Up @@ -874,6 +874,107 @@ TRACE_EVENT(ext4_forget,
__entry->mode, __entry->is_metadata, __entry->block)
);

TRACE_EVENT(ext4_da_update_reserve_space,
TP_PROTO(struct inode *inode, int used_blocks),

TP_ARGS(inode, used_blocks),

TP_STRUCT__entry(
__field( dev_t, dev )
__field( ino_t, ino )
__field( umode_t, mode )
__field( __u64, i_blocks )
__field( int, used_blocks )
__field( int, reserved_data_blocks )
__field( int, reserved_meta_blocks )
__field( int, allocated_meta_blocks )
),

TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->mode = inode->i_mode;
__entry->i_blocks = inode->i_blocks;
__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;
),

TP_printk("dev %s ino %lu mode 0%o i_blocks %llu used_blocks %d reserved_data_blocks %d reserved_meta_blocks %d allocated_meta_blocks %d",
jbd2_dev_to_name(__entry->dev), (unsigned long) __entry->ino,
__entry->mode, (unsigned long long) __entry->i_blocks,
__entry->used_blocks, __entry->reserved_data_blocks,
__entry->reserved_meta_blocks, __entry->allocated_meta_blocks)
);

TRACE_EVENT(ext4_da_reserve_space,
TP_PROTO(struct inode *inode, int md_needed),

TP_ARGS(inode, md_needed),

TP_STRUCT__entry(
__field( dev_t, dev )
__field( ino_t, ino )
__field( umode_t, mode )
__field( __u64, i_blocks )
__field( int, md_needed )
__field( int, reserved_data_blocks )
__field( int, reserved_meta_blocks )
),

TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->mode = inode->i_mode;
__entry->i_blocks = inode->i_blocks;
__entry->md_needed = md_needed;
__entry->reserved_data_blocks = EXT4_I(inode)->i_reserved_data_blocks;
__entry->reserved_meta_blocks = EXT4_I(inode)->i_reserved_meta_blocks;
),

TP_printk("dev %s ino %lu mode 0%o i_blocks %llu md_needed %d reserved_data_blocks %d reserved_meta_blocks %d",
jbd2_dev_to_name(__entry->dev), (unsigned long) __entry->ino,
__entry->mode, (unsigned long long) __entry->i_blocks,
__entry->md_needed, __entry->reserved_data_blocks,
__entry->reserved_meta_blocks)
);

TRACE_EVENT(ext4_da_release_space,
TP_PROTO(struct inode *inode, int freed_blocks),

TP_ARGS(inode, freed_blocks),

TP_STRUCT__entry(
__field( dev_t, dev )
__field( ino_t, ino )
__field( umode_t, mode )
__field( __u64, i_blocks )
__field( int, freed_blocks )
__field( int, reserved_data_blocks )
__field( int, reserved_meta_blocks )
__field( int, allocated_meta_blocks )
),

TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->mode = inode->i_mode;
__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;
),

TP_printk("dev %s ino %lu mode 0%o i_blocks %llu freed_blocks %d reserved_data_blocks %d reserved_meta_blocks %d allocated_meta_blocks %d",
jbd2_dev_to_name(__entry->dev), (unsigned long) __entry->ino,
__entry->mode, (unsigned long long) __entry->i_blocks,
__entry->freed_blocks, __entry->reserved_data_blocks,
__entry->reserved_meta_blocks, __entry->allocated_meta_blocks)
);


#endif /* _TRACE_EXT4_H */

/* This part must be outside protection */
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