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authorTheodore Ts'o <tytso@mit.edu>2009-09-30 08:32:06 +0400
committerTheodore Ts'o <tytso@mit.edu>2009-09-30 08:32:06 +0400
commitbf6993276f74d46776f35c45ddef29b981b1d1c6 (patch)
tree5c9cb128fed29a83add1932b12443edaa6fd06cc /fs/jbd2/commit.c
parent296c355cd6443d89fa251885a8d78778fe111dc4 (diff)
downloadlinux-bf6993276f74d46776f35c45ddef29b981b1d1c6.tar.xz
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>
Diffstat (limited to 'fs/jbd2/commit.c')
-rw-r--r--fs/jbd2/commit.c59
1 files changed, 28 insertions, 31 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 26d991ddc1e6..d4cfd6d2779e 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -410,10 +410,10 @@ void jbd2_journal_commit_transaction(journal_t *journal)
if (commit_transaction->t_synchronous_commit)
write_op = WRITE_SYNC_PLUG;
trace_jbd2_commit_locking(journal, commit_transaction);
- stats.u.run.rs_wait = commit_transaction->t_max_wait;
- stats.u.run.rs_locked = jiffies;
- stats.u.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
- stats.u.run.rs_locked);
+ stats.run.rs_wait = commit_transaction->t_max_wait;
+ stats.run.rs_locked = jiffies;
+ stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
+ stats.run.rs_locked);
spin_lock(&commit_transaction->t_handle_lock);
while (commit_transaction->t_updates) {
@@ -486,9 +486,9 @@ void jbd2_journal_commit_transaction(journal_t *journal)
jbd2_journal_switch_revoke_table(journal);
trace_jbd2_commit_flushing(journal, commit_transaction);
- stats.u.run.rs_flushing = jiffies;
- stats.u.run.rs_locked = jbd2_time_diff(stats.u.run.rs_locked,
- stats.u.run.rs_flushing);
+ stats.run.rs_flushing = jiffies;
+ stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked,
+ stats.run.rs_flushing);
commit_transaction->t_state = T_FLUSH;
journal->j_committing_transaction = commit_transaction;
@@ -523,11 +523,11 @@ void jbd2_journal_commit_transaction(journal_t *journal)
spin_unlock(&journal->j_state_lock);
trace_jbd2_commit_logging(journal, commit_transaction);
- stats.u.run.rs_logging = jiffies;
- stats.u.run.rs_flushing = jbd2_time_diff(stats.u.run.rs_flushing,
- stats.u.run.rs_logging);
- stats.u.run.rs_blocks = commit_transaction->t_outstanding_credits;
- stats.u.run.rs_blocks_logged = 0;
+ stats.run.rs_logging = jiffies;
+ stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing,
+ stats.run.rs_logging);
+ stats.run.rs_blocks = commit_transaction->t_outstanding_credits;
+ stats.run.rs_blocks_logged = 0;
J_ASSERT(commit_transaction->t_nr_buffers <=
commit_transaction->t_outstanding_credits);
@@ -695,7 +695,7 @@ start_journal_io:
submit_bh(write_op, bh);
}
cond_resched();
- stats.u.run.rs_blocks_logged += bufs;
+ stats.run.rs_blocks_logged += bufs;
/* Force a new descriptor to be generated next
time round the loop. */
@@ -988,33 +988,30 @@ restart_loop:
J_ASSERT(commit_transaction->t_state == T_COMMIT);
commit_transaction->t_start = jiffies;
- stats.u.run.rs_logging = jbd2_time_diff(stats.u.run.rs_logging,
- commit_transaction->t_start);
+ stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging,
+ commit_transaction->t_start);
/*
- * File the transaction for history
+ * File the transaction statistics
*/
- stats.ts_type = JBD2_STATS_RUN;
stats.ts_tid = commit_transaction->t_tid;
- stats.u.run.rs_handle_count = commit_transaction->t_handle_count;
- spin_lock(&journal->j_history_lock);
- memcpy(journal->j_history + journal->j_history_cur, &stats,
- sizeof(stats));
- if (++journal->j_history_cur == journal->j_history_max)
- journal->j_history_cur = 0;
+ stats.run.rs_handle_count = commit_transaction->t_handle_count;
+ trace_jbd2_run_stats(journal->j_fs_dev->bd_dev,
+ commit_transaction->t_tid, &stats.run);
/*
* Calculate overall stats
*/
+ spin_lock(&journal->j_history_lock);
journal->j_stats.ts_tid++;
- journal->j_stats.u.run.rs_wait += stats.u.run.rs_wait;
- journal->j_stats.u.run.rs_running += stats.u.run.rs_running;
- journal->j_stats.u.run.rs_locked += stats.u.run.rs_locked;
- journal->j_stats.u.run.rs_flushing += stats.u.run.rs_flushing;
- journal->j_stats.u.run.rs_logging += stats.u.run.rs_logging;
- journal->j_stats.u.run.rs_handle_count += stats.u.run.rs_handle_count;
- journal->j_stats.u.run.rs_blocks += stats.u.run.rs_blocks;
- journal->j_stats.u.run.rs_blocks_logged += stats.u.run.rs_blocks_logged;
+ journal->j_stats.run.rs_wait += stats.run.rs_wait;
+ journal->j_stats.run.rs_running += stats.run.rs_running;
+ journal->j_stats.run.rs_locked += stats.run.rs_locked;
+ journal->j_stats.run.rs_flushing += stats.run.rs_flushing;
+ journal->j_stats.run.rs_logging += stats.run.rs_logging;
+ journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count;
+ journal->j_stats.run.rs_blocks += stats.run.rs_blocks;
+ journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged;
spin_unlock(&journal->j_history_lock);
commit_transaction->t_state = T_FINISHED;