jbd2: Use tracepoints for history file
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>
diff --git a/include/trace/events/jbd2.h b/include/trace/events/jbd2.h
index b851f0b..3c60b75 100644
--- a/include/trace/events/jbd2.h
+++ b/include/trace/events/jbd2.h
@@ -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 @@
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 */