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| author | Theodore Ts'o <tytso@mit.edu> | 2010-05-16 09:00:00 (GMT) |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-05-16 09:00:00 (GMT) |
| commit | c35a56a090eacefca07afeb994029b57d8dd8025 (patch) | |
| tree | 2a42c07c270b07725d9798bc89bc9aa0aaf2c184 | |
| parent | c445e3e0a5c2804524dec6e55f66d63f6bc5bc3e (diff) | |
| download | linux-c35a56a090eacefca07afeb994029b57d8dd8025.tar.xz | |
jbd2: Improve scalability by not taking j_state_lock in jbd2_journal_stop()
One of the most contended locks in the jbd2 layer is j_state_lock when
running dbench. This is especially true if using the real-time kernel
with its "sleeping spinlocks" patch that replaces spinlocks with
priority inheriting mutexes --- but it also shows up on large SMP
benchmarks.
Thanks to John Stultz for pointing this out.
Reviewed by Mingming Cao and Jan Kara.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| -rw-r--r-- | fs/jbd2/transaction.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index bfc70f5..e214d68 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -1311,7 +1311,6 @@ int jbd2_journal_stop(handle_t *handle) if (handle->h_sync) transaction->t_synchronous_commit = 1; current->journal_info = NULL; - spin_lock(&journal->j_state_lock); spin_lock(&transaction->t_handle_lock); transaction->t_outstanding_credits -= handle->h_buffer_credits; transaction->t_updates--; @@ -1340,8 +1339,7 @@ int jbd2_journal_stop(handle_t *handle) jbd_debug(2, "transaction too old, requesting commit for " "handle %p\n", handle); /* This is non-blocking */ - __jbd2_log_start_commit(journal, transaction->t_tid); - spin_unlock(&journal->j_state_lock); + jbd2_log_start_commit(journal, transaction->t_tid); /* * Special case: JBD2_SYNC synchronous updates require us @@ -1351,7 +1349,6 @@ int jbd2_journal_stop(handle_t *handle) err = jbd2_log_wait_commit(journal, tid); } else { spin_unlock(&transaction->t_handle_lock); - spin_unlock(&journal->j_state_lock); } lock_map_release(&handle->h_lockdep_map); |