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jbd2: Use tracepoints for history file

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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
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27
include/linux/jbd2.h
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@@ -464,9 +464,9 @@ struct handle_s
*/
struct transaction_chp_stats_s {
unsigned long cs_chp_time;
unsigned long cs_forced_to_close;
unsigned long cs_written;
unsigned long cs_dropped;
__u32 cs_forced_to_close;
__u32 cs_written;
__u32 cs_dropped;
};
/* The transaction_t type is the guts of the journaling mechanism. It
@@ -668,23 +668,16 @@ struct transaction_run_stats_s {
unsigned long rs_flushing;
unsigned long rs_logging;
unsigned long rs_handle_count;
unsigned long rs_blocks;
unsigned long rs_blocks_logged;
__u32 rs_handle_count;
__u32 rs_blocks;
__u32 rs_blocks_logged;
};
struct transaction_stats_s {
int ts_type;
unsigned long ts_tid;
union {
struct transaction_run_stats_s run;
struct transaction_chp_stats_s chp;
} u;
struct transaction_run_stats_s run;
};
#define JBD2_STATS_RUN 1
#define JBD2_STATS_CHECKPOINT 2
static inline unsigned long
jbd2_time_diff(unsigned long start, unsigned long end)
{
@@ -988,12 +981,6 @@ struct journal_s
/*
* Journal statistics
*/
struct transaction_stats_s *j_history;
int j_history_max;
int j_history_cur;
/*
* Protect the transactions statistics history
*/
spinlock_t j_history_lock;
struct proc_dir_entry *j_proc_entry;
struct transaction_stats_s j_stats;