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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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59
fs/jbd2/commit.c
View file

@ -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;