ext4: Use tracepoints for mb_history trace file
The /proc/fs/ext4/<dev>/mb_history was maintained manually, and had a
number of problems: it required a largish amount of memory to be
allocated for each ext4 filesystem, and the s_mb_history_lock
introduced a CPU contention problem.
By ripping out the mb_history code and replacing it with ftrace
tracepoints, and we get more functionality: timestamps, event
filtering, the ability to correlate mballoc history with other ext4
tracepoints, etc.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 7c6bbb7..b832025 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -743,6 +743,169 @@
__entry->data_blocks, __entry->meta_blocks)
);
+TRACE_EVENT(ext4_mballoc_alloc,
+ TP_PROTO(struct ext4_allocation_context *ac),
+
+ TP_ARGS(ac),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( ino_t, ino )
+ __field( __u16, found )
+ __field( __u16, groups )
+ __field( __u16, buddy )
+ __field( __u16, flags )
+ __field( __u16, tail )
+ __field( __u8, cr )
+ __field( __u32, orig_logical )
+ __field( int, orig_start )
+ __field( __u32, orig_group )
+ __field( int, orig_len )
+ __field( __u32, goal_logical )
+ __field( int, goal_start )
+ __field( __u32, goal_group )
+ __field( int, goal_len )
+ __field( __u32, result_logical )
+ __field( int, result_start )
+ __field( __u32, result_group )
+ __field( int, result_len )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = ac->ac_inode->i_sb->s_dev;
+ __entry->ino = ac->ac_inode->i_ino;
+ __entry->found = ac->ac_found;
+ __entry->flags = ac->ac_flags;
+ __entry->groups = ac->ac_groups_scanned;
+ __entry->buddy = ac->ac_buddy;
+ __entry->tail = ac->ac_tail;
+ __entry->cr = ac->ac_criteria;
+ __entry->orig_logical = ac->ac_o_ex.fe_logical;
+ __entry->orig_start = ac->ac_o_ex.fe_start;
+ __entry->orig_group = ac->ac_o_ex.fe_group;
+ __entry->orig_len = ac->ac_o_ex.fe_len;
+ __entry->goal_logical = ac->ac_g_ex.fe_logical;
+ __entry->goal_start = ac->ac_g_ex.fe_start;
+ __entry->goal_group = ac->ac_g_ex.fe_group;
+ __entry->goal_len = ac->ac_g_ex.fe_len;
+ __entry->result_logical = ac->ac_f_ex.fe_logical;
+ __entry->result_start = ac->ac_f_ex.fe_start;
+ __entry->result_group = ac->ac_f_ex.fe_group;
+ __entry->result_len = ac->ac_f_ex.fe_len;
+ ),
+
+ TP_printk("dev %s inode %lu orig %u/%d/%u@%u goal %u/%d/%u@%u "
+ "result %u/%d/%u@%u blks %u grps %u cr %u flags 0x%04x "
+ "tail %u broken %u",
+ jbd2_dev_to_name(__entry->dev), (unsigned long) __entry->ino,
+ __entry->orig_group, __entry->orig_start,
+ __entry->orig_len, __entry->orig_logical,
+ __entry->goal_group, __entry->goal_start,
+ __entry->goal_len, __entry->goal_logical,
+ __entry->result_group, __entry->result_start,
+ __entry->result_len, __entry->result_logical,
+ __entry->found, __entry->groups, __entry->cr,
+ __entry->flags, __entry->tail,
+ __entry->buddy ? 1 << __entry->buddy : 0)
+);
+
+TRACE_EVENT(ext4_mballoc_prealloc,
+ TP_PROTO(struct ext4_allocation_context *ac),
+
+ TP_ARGS(ac),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( ino_t, ino )
+ __field( __u32, orig_logical )
+ __field( int, orig_start )
+ __field( __u32, orig_group )
+ __field( int, orig_len )
+ __field( __u32, result_logical )
+ __field( int, result_start )
+ __field( __u32, result_group )
+ __field( int, result_len )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = ac->ac_inode->i_sb->s_dev;
+ __entry->ino = ac->ac_inode->i_ino;
+ __entry->orig_logical = ac->ac_o_ex.fe_logical;
+ __entry->orig_start = ac->ac_o_ex.fe_start;
+ __entry->orig_group = ac->ac_o_ex.fe_group;
+ __entry->orig_len = ac->ac_o_ex.fe_len;
+ __entry->result_logical = ac->ac_b_ex.fe_logical;
+ __entry->result_start = ac->ac_b_ex.fe_start;
+ __entry->result_group = ac->ac_b_ex.fe_group;
+ __entry->result_len = ac->ac_b_ex.fe_len;
+ ),
+
+ TP_printk("dev %s inode %lu orig %u/%d/%u@%u result %u/%d/%u@%u",
+ jbd2_dev_to_name(__entry->dev), (unsigned long) __entry->ino,
+ __entry->orig_group, __entry->orig_start,
+ __entry->orig_len, __entry->orig_logical,
+ __entry->result_group, __entry->result_start,
+ __entry->result_len, __entry->result_logical)
+);
+
+TRACE_EVENT(ext4_mballoc_discard,
+ TP_PROTO(struct ext4_allocation_context *ac),
+
+ TP_ARGS(ac),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( ino_t, ino )
+ __field( __u32, result_logical )
+ __field( int, result_start )
+ __field( __u32, result_group )
+ __field( int, result_len )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = ac->ac_inode->i_sb->s_dev;
+ __entry->ino = ac->ac_inode->i_ino;
+ __entry->result_logical = ac->ac_b_ex.fe_logical;
+ __entry->result_start = ac->ac_b_ex.fe_start;
+ __entry->result_group = ac->ac_b_ex.fe_group;
+ __entry->result_len = ac->ac_b_ex.fe_len;
+ ),
+
+ TP_printk("dev %s inode %lu extent %u/%d/%u@%u ",
+ jbd2_dev_to_name(__entry->dev), (unsigned long) __entry->ino,
+ __entry->result_group, __entry->result_start,
+ __entry->result_len, __entry->result_logical)
+);
+
+TRACE_EVENT(ext4_mballoc_free,
+ TP_PROTO(struct ext4_allocation_context *ac),
+
+ TP_ARGS(ac),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( ino_t, ino )
+ __field( __u32, result_logical )
+ __field( int, result_start )
+ __field( __u32, result_group )
+ __field( int, result_len )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = ac->ac_inode->i_sb->s_dev;
+ __entry->ino = ac->ac_inode->i_ino;
+ __entry->result_logical = ac->ac_b_ex.fe_logical;
+ __entry->result_start = ac->ac_b_ex.fe_start;
+ __entry->result_group = ac->ac_b_ex.fe_group;
+ __entry->result_len = ac->ac_b_ex.fe_len;
+ ),
+
+ TP_printk("dev %s inode %lu extent %u/%d/%u@%u ",
+ jbd2_dev_to_name(__entry->dev), (unsigned long) __entry->ino,
+ __entry->result_group, __entry->result_start,
+ __entry->result_len, __entry->result_logical)
+);
+
#endif /* _TRACE_EXT4_H */
/* This part must be outside protection */