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jbd2: add tracepoints which provide per-handle statistics

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Handles which stay open a long time are problematic when it comes time
to close down a transaction so it can be committed.  These tracepoints
will help us determine which ones are the problematic ones, and to
validate whether changes makes things better or worse.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2013-02-08 13:00:22 -05:00
parent 078d5039a1
commit 343d9c283c
3 changed files with 131 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/jbd2.h
+7 -1
View File
@@ -400,6 +400,11 @@ struct jbd2_journal_handle
unsigned int h_sync: 1; /* sync-on-close */
unsigned int h_jdata: 1; /* force data journaling */
unsigned int h_aborted: 1; /* fatal error on handle */
unsigned int h_type: 8; /* for handle statistics */
unsigned int h_line_no: 16; /* for handle statistics */
unsigned long h_start_jiffies;
unsigned int h_requested_credits;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map h_lockdep_map;
@@ -1071,7 +1076,8 @@ static inline handle_t *journal_current_handle(void)
*/
extern handle_t *jbd2_journal_start(journal_t *, int nblocks);
extern handle_t *jbd2__journal_start(journal_t *, int nblocks, gfp_t gfp_mask);
extern handle_t *jbd2__journal_start(journal_t *, int nblocks, gfp_t gfp_mask,
unsigned int type, unsigned int line_no);
extern int jbd2_journal_restart(handle_t *, int nblocks);
extern int jbd2__journal_restart(handle_t *, int nblocks, gfp_t gfp_mask);
extern int jbd2_journal_extend (handle_t *, int nblocks);
include/trace/events/jbd2.h
+98
View File
@@ -132,6 +132,104 @@ TRACE_EVENT(jbd2_submit_inode_data,
(unsigned long) __entry->ino)
);
TRACE_EVENT(jbd2_handle_start,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int requested_blocks),
TP_ARGS(dev, tid, type, line_no, requested_blocks),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( unsigned long, tid )
__field( unsigned int, type )
__field( unsigned int, line_no )
__field( int, requested_blocks)
),
TP_fast_assign(
__entry->dev = dev;
__entry->tid = tid;
__entry->type = type;
__entry->line_no = line_no;
__entry->requested_blocks = requested_blocks;
),
TP_printk("dev %d,%d tid %lu type %u line_no %u "
"requested_blocks %d",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,
__entry->type, __entry->line_no, __entry->requested_blocks)
);
TRACE_EVENT(jbd2_handle_extend,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int buffer_credits,
int requested_blocks),
TP_ARGS(dev, tid, type, line_no, buffer_credits, requested_blocks),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( unsigned long, tid )
__field( unsigned int, type )
__field( unsigned int, line_no )
__field( int, buffer_credits )
__field( int, requested_blocks)
),
TP_fast_assign(
__entry->dev = dev;
__entry->tid = tid;
__entry->type = type;
__entry->line_no = line_no;
__entry->buffer_credits = buffer_credits;
__entry->requested_blocks = requested_blocks;
),
TP_printk("dev %d,%d tid %lu type %u line_no %u "
"buffer_credits %d requested_blocks %d",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,
__entry->type, __entry->line_no, __entry->buffer_credits,
__entry->requested_blocks)
);
TRACE_EVENT(jbd2_handle_stats,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int interval, int sync,
int requested_blocks, int dirtied_blocks),
TP_ARGS(dev, tid, type, line_no, interval, sync,
requested_blocks, dirtied_blocks),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( unsigned long, tid )
__field( unsigned int, type )
__field( unsigned int, line_no )
__field( int, interval )
__field( int, sync )
__field( int, requested_blocks)
__field( int, dirtied_blocks )
),
TP_fast_assign(
__entry->dev = dev;
__entry->tid = tid;
__entry->type = type;
__entry->line_no = line_no;
__entry->interval = interval;
__entry->sync = sync;
__entry->requested_blocks = requested_blocks;
__entry->dirtied_blocks = dirtied_blocks;
),
TP_printk("dev %d,%d tid %lu type %u line_no %u interval %d "
"sync %d requested_blocks %d dirtied_blocks %d",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,
__entry->type, __entry->line_no, __entry->interval,
__entry->sync, __entry->requested_blocks,
__entry->dirtied_blocks)
);
TRACE_EVENT(jbd2_run_stats,
TP_PROTO(dev_t dev, unsigned long tid,
struct transaction_run_stats_s *stats),