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jbd2: Call journal commit callback without holding j_list_lock

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Avoid freeing the transaction in __jbd2_journal_drop_transaction() so
the journal commit callback can run without holding j_list_lock, to
avoid lock contention on this spinlock.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Aneesh Kumar K.V 2008-11-06 17:50:21 -05:00 committed by Theodore Ts'o
parent c3a326a657
commit fb68407b0d
3 changed files with 11 additions and 8 deletions
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2
fs/jbd2/checkpoint.c
View File

@ -682,6 +682,7 @@ int __jbd2_journal_remove_checkpoint(struct journal_head *jh)
safely remove this transaction from the log */
__jbd2_journal_drop_transaction(journal, transaction);
kfree(transaction);
/* Just in case anybody was waiting for more transactions to be
checkpointed... */
@ -756,5 +757,4 @@ void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transact
J_ASSERT(journal->j_running_transaction != transaction);
jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid);
kfree(transaction);
}

13
fs/jbd2/commit.c
View File

@ -363,7 +363,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
int space_left = 0;
int first_tag = 0;
int tag_flag;
int i;
int i, to_free = 0;
int tag_bytes = journal_tag_bytes(journal);
struct buffer_head *cbh = NULL; /* For transactional checksums */
__u32 crc32_sum = ~0;
@ -1011,12 +1011,10 @@ void jbd2_journal_commit_transaction(journal_t *journal)
journal->j_average_commit_time = commit_time;
spin_unlock(&journal->j_state_lock);
if (journal->j_commit_callback)
journal->j_commit_callback(journal, commit_transaction);
if (commit_transaction->t_checkpoint_list == NULL &&
commit_transaction->t_checkpoint_io_list == NULL) {
__jbd2_journal_drop_transaction(journal, commit_transaction);
to_free = 1;
} else {
if (journal->j_checkpoint_transactions == NULL) {
journal->j_checkpoint_transactions = commit_transaction;
@ -1035,11 +1033,16 @@ void jbd2_journal_commit_transaction(journal_t *journal)
}
spin_unlock(&journal->j_list_lock);
if (journal->j_commit_callback)
journal->j_commit_callback(journal, commit_transaction);
trace_mark(jbd2_end_commit, "dev %s transaction %d head %d",
journal->j_devname, journal->j_commit_sequence,
journal->j_devname, commit_transaction->t_tid,
journal->j_tail_sequence);
jbd_debug(1, "JBD: commit %d complete, head %d\n",
journal->j_commit_sequence, journal->j_tail_sequence);
if (to_free)
kfree(commit_transaction);
wake_up(&journal->j_wait_done_commit);
}

4
include/linux/jbd2.h
View File

@ -1179,8 +1179,8 @@ int jbd2_log_wait_commit(journal_t *journal, tid_t tid);
int jbd2_log_do_checkpoint(journal_t *journal);
void __jbd2_log_wait_for_space(journal_t *journal);
extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *);
extern int jbd2_cleanup_journal_tail(journal_t *);
extern void __jbd2_journal_drop_transaction(journal_t *, transaction_t *);
extern int jbd2_cleanup_journal_tail(journal_t *);
/* Debugging code only: */