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jbd: Add fixed tracepoints

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This commit adds fixed tracepoint for jbd. It has been based on fixed
tracepoints for jbd2, however there are missing those for collecting
statistics, since I think that it will require more intrusive patch so I
should have its own commit, if someone decide that it is needed. Also
there are new tracepoints in __journal_drop_transaction() and
journal_update_superblock().

The list of jbd tracepoints:

jbd_checkpoint
jbd_start_commit
jbd_commit_locking
jbd_commit_flushing
jbd_commit_logging
jbd_drop_transaction
jbd_end_commit
jbd_do_submit_data
jbd_cleanup_journal_tail
jbd_update_superblock_end

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Lukas Czerner 2011-05-23 18:33:02 +02:00 committed by Jan Kara
parent 785c4bcc0d
commit 99cb1a318c
4 changed files with 222 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/jbd/checkpoint.c
View File

@ -22,6 +22,7 @@
#include <linux/jbd.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <trace/events/jbd.h>
/*
* Unlink a buffer from a transaction checkpoint list.
@ -358,6 +359,7 @@ int log_do_checkpoint(journal_t *journal)
* journal straight away.
*/
result = cleanup_journal_tail(journal);
trace_jbd_checkpoint(journal, result);
jbd_debug(1, "cleanup_journal_tail returned %d\n", result);
if (result <= 0)
return result;
@ -503,6 +505,7 @@ int cleanup_journal_tail(journal_t *journal)
if (blocknr < journal->j_tail)
freed = freed + journal->j_last - journal->j_first;
trace_jbd_cleanup_journal_tail(journal, first_tid, blocknr, freed);
jbd_debug(1,
"Cleaning journal tail from %d to %d (offset %u), "
"freeing %u\n",
@ -752,6 +755,7 @@ void __journal_drop_transaction(journal_t *journal, transaction_t *transaction)
J_ASSERT(journal->j_committing_transaction != transaction);
J_ASSERT(journal->j_running_transaction != transaction);
trace_jbd_drop_transaction(journal, transaction);
jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid);
kfree(transaction);
}

11
fs/jbd/commit.c
View File

@ -21,6 +21,7 @@
#include <linux/pagemap.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <trace/events/jbd.h>
/*
* Default IO end handler for temporary BJ_IO buffer_heads.
@ -204,6 +205,8 @@ write_out_data:
if (!trylock_buffer(bh)) {
BUFFER_TRACE(bh, "needs blocking lock");
spin_unlock(&journal->j_list_lock);
trace_jbd_do_submit_data(journal,
commit_transaction);
/* Write out all data to prevent deadlocks */
journal_do_submit_data(wbuf, bufs, write_op);
bufs = 0;
@ -236,6 +239,8 @@ write_out_data:
jbd_unlock_bh_state(bh);
if (bufs == journal->j_wbufsize) {
spin_unlock(&journal->j_list_lock);
trace_jbd_do_submit_data(journal,
commit_transaction);
journal_do_submit_data(wbuf, bufs, write_op);
bufs = 0;
goto write_out_data;
@ -266,6 +271,7 @@ write_out_data:
}
}
spin_unlock(&journal->j_list_lock);
trace_jbd_do_submit_data(journal, commit_transaction);
journal_do_submit_data(wbuf, bufs, write_op);
return err;
@ -316,12 +322,14 @@ void journal_commit_transaction(journal_t *journal)
commit_transaction = journal->j_running_transaction;
J_ASSERT(commit_transaction->t_state == T_RUNNING);
trace_jbd_start_commit(journal, commit_transaction);
jbd_debug(1, "JBD: starting commit of transaction %d\n",
commit_transaction->t_tid);
spin_lock(&journal->j_state_lock);
commit_transaction->t_state = T_LOCKED;
trace_jbd_commit_locking(journal, commit_transaction);
spin_lock(&commit_transaction->t_handle_lock);
while (commit_transaction->t_updates) {
DEFINE_WAIT(wait);
@ -392,6 +400,7 @@ void journal_commit_transaction(journal_t *journal)
*/
journal_switch_revoke_table(journal);
trace_jbd_commit_flushing(journal, commit_transaction);
commit_transaction->t_state = T_FLUSH;
journal->j_committing_transaction = commit_transaction;
journal->j_running_transaction = NULL;
@ -493,6 +502,7 @@ void journal_commit_transaction(journal_t *journal)
commit_transaction->t_state = T_COMMIT;
spin_unlock(&journal->j_state_lock);
trace_jbd_commit_logging(journal, commit_transaction);
J_ASSERT(commit_transaction->t_nr_buffers <=
commit_transaction->t_outstanding_credits);
@ -946,6 +956,7 @@ restart_loop:
}
spin_unlock(&journal->j_list_lock);
trace_jbd_end_commit(journal, commit_transaction);
jbd_debug(1, "JBD: commit %d complete, head %d\n",
journal->j_commit_sequence, journal->j_tail_sequence);

4
fs/jbd/journal.c
View File

@ -38,6 +38,9 @@
#include <linux/debugfs.h>
#include <linux/ratelimit.h>
#define CREATE_TRACE_POINTS
#include <trace/events/jbd.h>
#include <asm/uaccess.h>
#include <asm/page.h>
@ -1065,6 +1068,7 @@ void journal_update_superblock(journal_t *journal, int wait)
} else
write_dirty_buffer(bh, WRITE);
trace_jbd_update_superblock_end(journal, wait);
out:
/* If we have just flushed the log (by marking s_start==0), then
* any future commit will have to be careful to update the

203
include/trace/events/jbd.h Normal file
View File

@ -0,0 +1,203 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM jbd
#if !defined(_TRACE_JBD_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_JBD_H
#include <linux/jbd.h>
#include <linux/tracepoint.h>
TRACE_EVENT(jbd_checkpoint,
TP_PROTO(journal_t *journal, int result),
TP_ARGS(journal, result),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( int, result )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->result = result;
),
TP_printk("dev %d,%d result %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->result)
);
DECLARE_EVENT_CLASS(jbd_commit,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( char, sync_commit )
__field( int, transaction )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->sync_commit = commit_transaction->t_synchronous_commit;
__entry->transaction = commit_transaction->t_tid;
),
TP_printk("dev %d,%d transaction %d sync %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->transaction, __entry->sync_commit)
);
DEFINE_EVENT(jbd_commit, jbd_start_commit,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction)
);
DEFINE_EVENT(jbd_commit, jbd_commit_locking,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction)
);
DEFINE_EVENT(jbd_commit, jbd_commit_flushing,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction)
);
DEFINE_EVENT(jbd_commit, jbd_commit_logging,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction)
);
TRACE_EVENT(jbd_drop_transaction,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( char, sync_commit )
__field( int, transaction )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->sync_commit = commit_transaction->t_synchronous_commit;
__entry->transaction = commit_transaction->t_tid;
),
TP_printk("dev %d,%d transaction %d sync %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->transaction, __entry->sync_commit)
);
TRACE_EVENT(jbd_end_commit,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( char, sync_commit )
__field( int, transaction )
__field( int, head )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->sync_commit = commit_transaction->t_synchronous_commit;
__entry->transaction = commit_transaction->t_tid;
__entry->head = journal->j_tail_sequence;
),
TP_printk("dev %d,%d transaction %d sync %d head %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->transaction, __entry->sync_commit, __entry->head)
);
TRACE_EVENT(jbd_do_submit_data,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( char, sync_commit )
__field( int, transaction )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->sync_commit = commit_transaction->t_synchronous_commit;
__entry->transaction = commit_transaction->t_tid;
),
TP_printk("dev %d,%d transaction %d sync %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->transaction, __entry->sync_commit)
);
TRACE_EVENT(jbd_cleanup_journal_tail,
TP_PROTO(journal_t *journal, tid_t first_tid,
unsigned long block_nr, unsigned long freed),
TP_ARGS(journal, first_tid, block_nr, freed),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( tid_t, tail_sequence )
__field( tid_t, first_tid )
__field(unsigned long, block_nr )
__field(unsigned long, freed )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->tail_sequence = journal->j_tail_sequence;
__entry->first_tid = first_tid;
__entry->block_nr = block_nr;
__entry->freed = freed;
),
TP_printk("dev %d,%d from %u to %u offset %lu freed %lu",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->tail_sequence, __entry->first_tid,
__entry->block_nr, __entry->freed)
);
TRACE_EVENT(jbd_update_superblock_end,
TP_PROTO(journal_t *journal, int wait),
TP_ARGS(journal, wait),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( int, wait )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->wait = wait;
),
TP_printk("dev %d,%d wait %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->wait)
);
#endif /* _TRACE_JBD_H */
/* This part must be outside protection */
#include <trace/define_trace.h>