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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>
This commit is contained in:
Theodore Ts'o
parent
296c355cd6
commit
bf6993276f
5 changed files with 130 additions and 228 deletions
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@ -643,6 +643,7 @@ out:
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int __jbd2_journal_remove_checkpoint(struct journal_head *jh)
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{
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struct transaction_chp_stats_s *stats;
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transaction_t *transaction;
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journal_t *journal;
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int ret = 0;
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@ -679,6 +680,12 @@ int __jbd2_journal_remove_checkpoint(struct journal_head *jh)
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/* OK, that was the last buffer for the transaction: we can now
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safely remove this transaction from the log */
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stats = &transaction->t_chp_stats;
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if (stats->cs_chp_time)
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stats->cs_chp_time = jbd2_time_diff(stats->cs_chp_time,
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jiffies);
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trace_jbd2_checkpoint_stats(journal->j_fs_dev->bd_dev,
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transaction->t_tid, stats);
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__jbd2_journal_drop_transaction(journal, transaction);
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kfree(transaction);
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@ -410,10 +410,10 @@ void jbd2_journal_commit_transaction(journal_t *journal)
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if (commit_transaction->t_synchronous_commit)
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write_op = WRITE_SYNC_PLUG;
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trace_jbd2_commit_locking(journal, commit_transaction);
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stats.u.run.rs_wait = commit_transaction->t_max_wait;
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stats.u.run.rs_locked = jiffies;
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stats.u.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
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stats.u.run.rs_locked);
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stats.run.rs_wait = commit_transaction->t_max_wait;
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stats.run.rs_locked = jiffies;
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stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
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stats.run.rs_locked);
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spin_lock(&commit_transaction->t_handle_lock);
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while (commit_transaction->t_updates) {
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@ -486,9 +486,9 @@ void jbd2_journal_commit_transaction(journal_t *journal)
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jbd2_journal_switch_revoke_table(journal);
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trace_jbd2_commit_flushing(journal, commit_transaction);
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stats.u.run.rs_flushing = jiffies;
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stats.u.run.rs_locked = jbd2_time_diff(stats.u.run.rs_locked,
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stats.u.run.rs_flushing);
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stats.run.rs_flushing = jiffies;
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stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked,
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stats.run.rs_flushing);
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commit_transaction->t_state = T_FLUSH;
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journal->j_committing_transaction = commit_transaction;
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@ -523,11 +523,11 @@ void jbd2_journal_commit_transaction(journal_t *journal)
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spin_unlock(&journal->j_state_lock);
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trace_jbd2_commit_logging(journal, commit_transaction);
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stats.u.run.rs_logging = jiffies;
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stats.u.run.rs_flushing = jbd2_time_diff(stats.u.run.rs_flushing,
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stats.u.run.rs_logging);
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stats.u.run.rs_blocks = commit_transaction->t_outstanding_credits;
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stats.u.run.rs_blocks_logged = 0;
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stats.run.rs_logging = jiffies;
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stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing,
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stats.run.rs_logging);
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stats.run.rs_blocks = commit_transaction->t_outstanding_credits;
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stats.run.rs_blocks_logged = 0;
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J_ASSERT(commit_transaction->t_nr_buffers <=
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commit_transaction->t_outstanding_credits);
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@ -695,7 +695,7 @@ start_journal_io:
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submit_bh(write_op, bh);
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}
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cond_resched();
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stats.u.run.rs_blocks_logged += bufs;
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stats.run.rs_blocks_logged += bufs;
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/* Force a new descriptor to be generated next
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time round the loop. */
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@ -988,33 +988,30 @@ restart_loop:
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J_ASSERT(commit_transaction->t_state == T_COMMIT);
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commit_transaction->t_start = jiffies;
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stats.u.run.rs_logging = jbd2_time_diff(stats.u.run.rs_logging,
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commit_transaction->t_start);
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stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging,
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commit_transaction->t_start);
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/*
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* File the transaction for history
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* File the transaction statistics
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*/
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stats.ts_type = JBD2_STATS_RUN;
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stats.ts_tid = commit_transaction->t_tid;
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stats.u.run.rs_handle_count = commit_transaction->t_handle_count;
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spin_lock(&journal->j_history_lock);
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memcpy(journal->j_history + journal->j_history_cur, &stats,
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sizeof(stats));
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if (++journal->j_history_cur == journal->j_history_max)
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journal->j_history_cur = 0;
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stats.run.rs_handle_count = commit_transaction->t_handle_count;
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trace_jbd2_run_stats(journal->j_fs_dev->bd_dev,
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commit_transaction->t_tid, &stats.run);
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/*
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* Calculate overall stats
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*/
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spin_lock(&journal->j_history_lock);
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journal->j_stats.ts_tid++;
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journal->j_stats.u.run.rs_wait += stats.u.run.rs_wait;
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journal->j_stats.u.run.rs_running += stats.u.run.rs_running;
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journal->j_stats.u.run.rs_locked += stats.u.run.rs_locked;
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journal->j_stats.u.run.rs_flushing += stats.u.run.rs_flushing;
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journal->j_stats.u.run.rs_logging += stats.u.run.rs_logging;
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journal->j_stats.u.run.rs_handle_count += stats.u.run.rs_handle_count;
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journal->j_stats.u.run.rs_blocks += stats.u.run.rs_blocks;
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journal->j_stats.u.run.rs_blocks_logged += stats.u.run.rs_blocks_logged;
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journal->j_stats.run.rs_wait += stats.run.rs_wait;
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journal->j_stats.run.rs_running += stats.run.rs_running;
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journal->j_stats.run.rs_locked += stats.run.rs_locked;
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journal->j_stats.run.rs_flushing += stats.run.rs_flushing;
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journal->j_stats.run.rs_logging += stats.run.rs_logging;
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journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count;
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journal->j_stats.run.rs_blocks += stats.run.rs_blocks;
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journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged;
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spin_unlock(&journal->j_history_lock);
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commit_transaction->t_state = T_FINISHED;
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@ -676,153 +676,6 @@ struct jbd2_stats_proc_session {
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int max;
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};
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static void *jbd2_history_skip_empty(struct jbd2_stats_proc_session *s,
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struct transaction_stats_s *ts,
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int first)
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{
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if (ts == s->stats + s->max)
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ts = s->stats;
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if (!first && ts == s->stats + s->start)
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return NULL;
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while (ts->ts_type == 0) {
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ts++;
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if (ts == s->stats + s->max)
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ts = s->stats;
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if (ts == s->stats + s->start)
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return NULL;
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}
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return ts;
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}
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static void *jbd2_seq_history_start(struct seq_file *seq, loff_t *pos)
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{
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struct jbd2_stats_proc_session *s = seq->private;
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struct transaction_stats_s *ts;
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int l = *pos;
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if (l == 0)
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return SEQ_START_TOKEN;
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ts = jbd2_history_skip_empty(s, s->stats + s->start, 1);
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if (!ts)
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return NULL;
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l--;
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while (l) {
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ts = jbd2_history_skip_empty(s, ++ts, 0);
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if (!ts)
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break;
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l--;
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}
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return ts;
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}
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static void *jbd2_seq_history_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct jbd2_stats_proc_session *s = seq->private;
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struct transaction_stats_s *ts = v;
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++*pos;
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if (v == SEQ_START_TOKEN)
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return jbd2_history_skip_empty(s, s->stats + s->start, 1);
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else
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return jbd2_history_skip_empty(s, ++ts, 0);
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}
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static int jbd2_seq_history_show(struct seq_file *seq, void *v)
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{
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struct transaction_stats_s *ts = v;
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if (v == SEQ_START_TOKEN) {
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seq_printf(seq, "%-4s %-5s %-5s %-5s %-5s %-5s %-5s %-6s %-5s "
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"%-5s %-5s %-5s %-5s %-5s\n", "R/C", "tid",
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"wait", "run", "lock", "flush", "log", "hndls",
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"block", "inlog", "ctime", "write", "drop",
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"close");
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return 0;
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}
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if (ts->ts_type == JBD2_STATS_RUN)
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seq_printf(seq, "%-4s %-5lu %-5u %-5u %-5u %-5u %-5u "
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"%-6lu %-5lu %-5lu\n", "R", ts->ts_tid,
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jiffies_to_msecs(ts->u.run.rs_wait),
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jiffies_to_msecs(ts->u.run.rs_running),
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jiffies_to_msecs(ts->u.run.rs_locked),
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jiffies_to_msecs(ts->u.run.rs_flushing),
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jiffies_to_msecs(ts->u.run.rs_logging),
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ts->u.run.rs_handle_count,
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ts->u.run.rs_blocks,
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ts->u.run.rs_blocks_logged);
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else if (ts->ts_type == JBD2_STATS_CHECKPOINT)
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seq_printf(seq, "%-4s %-5lu %48s %-5u %-5lu %-5lu %-5lu\n",
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"C", ts->ts_tid, " ",
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jiffies_to_msecs(ts->u.chp.cs_chp_time),
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ts->u.chp.cs_written, ts->u.chp.cs_dropped,
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ts->u.chp.cs_forced_to_close);
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else
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J_ASSERT(0);
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return 0;
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}
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static void jbd2_seq_history_stop(struct seq_file *seq, void *v)
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{
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}
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static const struct seq_operations jbd2_seq_history_ops = {
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.start = jbd2_seq_history_start,
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.next = jbd2_seq_history_next,
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.stop = jbd2_seq_history_stop,
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.show = jbd2_seq_history_show,
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};
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static int jbd2_seq_history_open(struct inode *inode, struct file *file)
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{
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journal_t *journal = PDE(inode)->data;
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struct jbd2_stats_proc_session *s;
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int rc, size;
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s = kmalloc(sizeof(*s), GFP_KERNEL);
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if (s == NULL)
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return -ENOMEM;
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size = sizeof(struct transaction_stats_s) * journal->j_history_max;
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s->stats = kmalloc(size, GFP_KERNEL);
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if (s->stats == NULL) {
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kfree(s);
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return -ENOMEM;
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}
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spin_lock(&journal->j_history_lock);
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memcpy(s->stats, journal->j_history, size);
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s->max = journal->j_history_max;
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s->start = journal->j_history_cur % s->max;
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spin_unlock(&journal->j_history_lock);
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rc = seq_open(file, &jbd2_seq_history_ops);
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if (rc == 0) {
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struct seq_file *m = file->private_data;
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m->private = s;
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} else {
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kfree(s->stats);
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kfree(s);
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}
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return rc;
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}
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static int jbd2_seq_history_release(struct inode *inode, struct file *file)
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{
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struct seq_file *seq = file->private_data;
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struct jbd2_stats_proc_session *s = seq->private;
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kfree(s->stats);
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kfree(s);
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return seq_release(inode, file);
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}
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static struct file_operations jbd2_seq_history_fops = {
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.owner = THIS_MODULE,
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.open = jbd2_seq_history_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = jbd2_seq_history_release,
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};
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static void *jbd2_seq_info_start(struct seq_file *seq, loff_t *pos)
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{
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return *pos ? NULL : SEQ_START_TOKEN;
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@ -839,29 +692,29 @@ static int jbd2_seq_info_show(struct seq_file *seq, void *v)
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if (v != SEQ_START_TOKEN)
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return 0;
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seq_printf(seq, "%lu transaction, each upto %u blocks\n",
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seq_printf(seq, "%lu transaction, each up to %u blocks\n",
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s->stats->ts_tid,
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s->journal->j_max_transaction_buffers);
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if (s->stats->ts_tid == 0)
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return 0;
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seq_printf(seq, "average: \n %ums waiting for transaction\n",
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jiffies_to_msecs(s->stats->u.run.rs_wait / s->stats->ts_tid));
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jiffies_to_msecs(s->stats->run.rs_wait / s->stats->ts_tid));
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seq_printf(seq, " %ums running transaction\n",
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jiffies_to_msecs(s->stats->u.run.rs_running / s->stats->ts_tid));
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jiffies_to_msecs(s->stats->run.rs_running / s->stats->ts_tid));
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seq_printf(seq, " %ums transaction was being locked\n",
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jiffies_to_msecs(s->stats->u.run.rs_locked / s->stats->ts_tid));
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jiffies_to_msecs(s->stats->run.rs_locked / s->stats->ts_tid));
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seq_printf(seq, " %ums flushing data (in ordered mode)\n",
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jiffies_to_msecs(s->stats->u.run.rs_flushing / s->stats->ts_tid));
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jiffies_to_msecs(s->stats->run.rs_flushing / s->stats->ts_tid));
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seq_printf(seq, " %ums logging transaction\n",
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jiffies_to_msecs(s->stats->u.run.rs_logging / s->stats->ts_tid));
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jiffies_to_msecs(s->stats->run.rs_logging / s->stats->ts_tid));
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seq_printf(seq, " %lluus average transaction commit time\n",
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div_u64(s->journal->j_average_commit_time, 1000));
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seq_printf(seq, " %lu handles per transaction\n",
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s->stats->u.run.rs_handle_count / s->stats->ts_tid);
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s->stats->run.rs_handle_count / s->stats->ts_tid);
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seq_printf(seq, " %lu blocks per transaction\n",
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s->stats->u.run.rs_blocks / s->stats->ts_tid);
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s->stats->run.rs_blocks / s->stats->ts_tid);
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seq_printf(seq, " %lu logged blocks per transaction\n",
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s->stats->u.run.rs_blocks_logged / s->stats->ts_tid);
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s->stats->run.rs_blocks_logged / s->stats->ts_tid);
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return 0;
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}
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@ -931,8 +784,6 @@ static void jbd2_stats_proc_init(journal_t *journal)
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{
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journal->j_proc_entry = proc_mkdir(journal->j_devname, proc_jbd2_stats);
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if (journal->j_proc_entry) {
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proc_create_data("history", S_IRUGO, journal->j_proc_entry,
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&jbd2_seq_history_fops, journal);
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proc_create_data("info", S_IRUGO, journal->j_proc_entry,
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&jbd2_seq_info_fops, journal);
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}
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@ -941,27 +792,9 @@ static void jbd2_stats_proc_init(journal_t *journal)
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static void jbd2_stats_proc_exit(journal_t *journal)
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{
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remove_proc_entry("info", journal->j_proc_entry);
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remove_proc_entry("history", journal->j_proc_entry);
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remove_proc_entry(journal->j_devname, proc_jbd2_stats);
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}
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static void journal_init_stats(journal_t *journal)
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{
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int size;
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if (!proc_jbd2_stats)
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return;
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journal->j_history_max = 100;
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size = sizeof(struct transaction_stats_s) * journal->j_history_max;
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journal->j_history = kzalloc(size, GFP_KERNEL);
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if (!journal->j_history) {
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journal->j_history_max = 0;
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return;
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}
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spin_lock_init(&journal->j_history_lock);
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}
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/*
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* Management for journal control blocks: functions to create and
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* destroy journal_t structures, and to initialise and read existing
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@ -1006,7 +839,7 @@ static journal_t * journal_init_common (void)
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goto fail;
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}
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journal_init_stats(journal);
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spin_lock_init(&journal->j_history_lock);
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return journal;
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fail:
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@ -464,9 +464,9 @@ struct handle_s
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*/
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struct transaction_chp_stats_s {
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unsigned long cs_chp_time;
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unsigned long cs_forced_to_close;
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unsigned long cs_written;
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unsigned long cs_dropped;
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__u32 cs_forced_to_close;
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__u32 cs_written;
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__u32 cs_dropped;
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};
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/* The transaction_t type is the guts of the journaling mechanism. It
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@ -668,23 +668,16 @@ struct transaction_run_stats_s {
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unsigned long rs_flushing;
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unsigned long rs_logging;
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unsigned long rs_handle_count;
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unsigned long rs_blocks;
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unsigned long rs_blocks_logged;
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__u32 rs_handle_count;
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__u32 rs_blocks;
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__u32 rs_blocks_logged;
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};
|
||||
|
||||
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;
|
||||
|
|
|
|||
|
|
@ -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 */
|
||||
|
|
|
|||
Loading…
Reference in a new issue