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Date: Tue, 24 May 2011 18:40:51 +0200
From: Jan Kara <jack@...e.cz>
To: Lukas Czerner <lczerner@...hat.com>
Cc: linux-ext4@...r.kernel.org, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH 2/2 v2] jbd: Add fixed tracepoints
On Mon 23-05-11 18:33:02, Lukas Czerner wrote:
> 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@...hat.com>
> Cc: Jan Kara <jack@...e.cz>
Thanks. Merged.
Honza
> ---
> (v2: nothing has changed)
> fs/jbd/checkpoint.c | 4 +
> fs/jbd/commit.c | 11 +++
> fs/jbd/journal.c | 4 +
> include/trace/events/jbd.h | 203 ++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 222 insertions(+), 0 deletions(-)
> create mode 100644 include/trace/events/jbd.h
>
> diff --git a/fs/jbd/checkpoint.c b/fs/jbd/checkpoint.c
> index e4b87bc..dea7503 100644
> --- a/fs/jbd/checkpoint.c
> +++ b/fs/jbd/checkpoint.c
> @@ -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);
> }
> diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
> index 69b1804..0f27f67 100644
> --- a/fs/jbd/commit.c
> +++ b/fs/jbd/commit.c
> @@ -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;
> @@ -322,12 +328,14 @@ 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);
> @@ -398,6 +406,7 @@ 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;
> @@ -499,6 +508,7 @@ 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);
>
> @@ -947,6 +957,7 @@ 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);
>
> diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
> index b3713af..6fa89b9 100644
> --- a/fs/jbd/journal.c
> +++ b/fs/jbd/journal.c
> @@ -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>
>
> @@ -1055,6 +1058,7 @@ 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
> diff --git a/include/trace/events/jbd.h b/include/trace/events/jbd.h
> new file mode 100644
> index 0000000..aff64d8
> --- /dev/null
> +++ b/include/trace/events/jbd.h
> @@ -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>
> --
> 1.7.4.4
>
--
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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