lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

jbd2: Use tracepoints for history file

Browse Source 
The /proc/fs/jbd2/<dev>/history was maintained manually; by using
tracepoints, we can get all of the existing functionality of the /proc
file plus extra capabilities thanks to the ftrace infrastructure.  We
save memory as a bonus.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2009-09-30 00:32:06 -04:00
parent 296c355cd6
commit bf6993276f
5 changed files with 130 additions and 228 deletions
Download Patch File Download Diff File Expand all files Collapse all files

78
include/trace/events/jbd2.h
View File

@@ -7,6 +7,9 @@
#include <linux/jbd2.h>
#include <linux/tracepoint.h>
struct transaction_chp_stats_s;
struct transaction_run_stats_s;
TRACE_EVENT(jbd2_checkpoint,
TP_PROTO(journal_t *journal, int result),
@@ -162,6 +165,81 @@ TRACE_EVENT(jbd2_submit_inode_data,
jbd2_dev_to_name(__entry->dev), (unsigned long) __entry->ino)
);
TRACE_EVENT(jbd2_run_stats,
TP_PROTO(dev_t dev, unsigned long tid,
struct transaction_run_stats_s *stats),
TP_ARGS(dev, tid, stats),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( unsigned long, tid )
__field( unsigned long, wait )
__field( unsigned long, running )
__field( unsigned long, locked )
__field( unsigned long, flushing )
__field( unsigned long, logging )
__field( __u32, handle_count )
__field( __u32, blocks )
__field( __u32, blocks_logged )
),
TP_fast_assign(
__entry->dev = dev;
__entry->tid = tid;
__entry->wait = stats->rs_wait;
__entry->running = stats->rs_running;
__entry->locked = stats->rs_locked;
__entry->flushing = stats->rs_flushing;
__entry->logging = stats->rs_logging;
__entry->handle_count = stats->rs_handle_count;
__entry->blocks = stats->rs_blocks;
__entry->blocks_logged = stats->rs_blocks_logged;
),
TP_printk("dev %s tid %lu wait %u running %u locked %u flushing %u "
"logging %u handle_count %u blocks %u blocks_logged %u",
jbd2_dev_to_name(__entry->dev), __entry->tid,
jiffies_to_msecs(__entry->wait),
jiffies_to_msecs(__entry->running),
jiffies_to_msecs(__entry->locked),
jiffies_to_msecs(__entry->flushing),
jiffies_to_msecs(__entry->logging),
__entry->handle_count, __entry->blocks,
__entry->blocks_logged)
);
TRACE_EVENT(jbd2_checkpoint_stats,
TP_PROTO(dev_t dev, unsigned long tid,
struct transaction_chp_stats_s *stats),
TP_ARGS(dev, tid, stats),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( unsigned long, tid )
__field( unsigned long, chp_time )
__field( __u32, forced_to_close )
__field( __u32, written )
__field( __u32, dropped )
),
TP_fast_assign(
__entry->dev = dev;
__entry->tid = tid;
__entry->chp_time = stats->cs_chp_time;
__entry->forced_to_close= stats->cs_forced_to_close;
__entry->written = stats->cs_written;
__entry->dropped = stats->cs_dropped;
),
TP_printk("dev %s tid %lu chp_time %u forced_to_close %u "
"written %u dropped %u",
jbd2_dev_to_name(__entry->dev), __entry->tid,
jiffies_to_msecs(__entry->chp_time),
__entry->forced_to_close, __entry->written, __entry->dropped)
);
#endif /* _TRACE_JBD2_H */
/* This part must be outside protection */