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jbd2: Change j_state_lock to be a rwlock_t

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Lockstat reports have shown that j_state_lock is a major source of
lock contention, especially on systems with more than 4 CPU cores.  So
change it to be a read/write spinlock.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
此提交包含在：
Theodore Ts'o
2010-08-03 21:35:12 -04:00
父節點 a51dca9cd3
當前提交 a931da6ac9
共有 8 個檔案被更改，包括 114 行新增 和 110 行删除
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74
fs/jbd2/transaction.c
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@@ -124,36 +124,38 @@ alloc_transaction:
jbd_debug(3, "New handle %p going live.\n", handle);
repeat:
/*
* We need to hold j_state_lock until t_updates has been incremented,
* for proper journal barrier handling
*/
spin_lock(&journal->j_state_lock);
repeat_locked:
repeat:
read_lock(&journal->j_state_lock);
if (is_journal_aborted(journal) ||
(journal->j_errno != 0 && !(journal->j_flags & JBD2_ACK_ERR))) {
spin_unlock(&journal->j_state_lock);
read_unlock(&journal->j_state_lock);
kfree(new_transaction);
return -EROFS;
}
/* Wait on the journal's transaction barrier if necessary */
if (journal->j_barrier_count) {
spin_unlock(&journal->j_state_lock);
read_unlock(&journal->j_state_lock);
wait_event(journal->j_wait_transaction_locked,
journal->j_barrier_count == 0);
goto repeat;
}
if (!journal->j_running_transaction) {
if (!new_transaction) {
spin_unlock(&journal->j_state_lock);
read_unlock(&journal->j_state_lock);
if (!new_transaction)
goto alloc_transaction;
write_lock(&journal->j_state_lock);
if (!journal->j_running_transaction) {
jbd2_get_transaction(journal, new_transaction);
new_transaction = NULL;
}
jbd2_get_transaction(journal, new_transaction);
new_transaction = NULL;
write_unlock(&journal->j_state_lock);
goto repeat;
}
transaction = journal->j_running_transaction;
@@ -167,7 +169,7 @@ repeat_locked:
prepare_to_wait(&journal->j_wait_transaction_locked,
&wait, TASK_UNINTERRUPTIBLE);
spin_unlock(&journal->j_state_lock);
read_unlock(&journal->j_state_lock);
schedule();
finish_wait(&journal->j_wait_transaction_locked, &wait);
goto repeat;
@@ -194,7 +196,7 @@ repeat_locked:
prepare_to_wait(&journal->j_wait_transaction_locked, &wait,
TASK_UNINTERRUPTIBLE);
__jbd2_log_start_commit(journal, transaction->t_tid);
spin_unlock(&journal->j_state_lock);
read_unlock(&journal->j_state_lock);
schedule();
finish_wait(&journal->j_wait_transaction_locked, &wait);
goto repeat;
@@ -228,8 +230,12 @@ repeat_locked:
if (__jbd2_log_space_left(journal) < jbd_space_needed(journal)) {
jbd_debug(2, "Handle %p waiting for checkpoint...\n", handle);
spin_unlock(&transaction->t_handle_lock);
__jbd2_log_wait_for_space(journal);
goto repeat_locked;
read_unlock(&journal->j_state_lock);
write_lock(&journal->j_state_lock);
if (__jbd2_log_space_left(journal) < jbd_space_needed(journal))
__jbd2_log_wait_for_space(journal);
write_unlock(&journal->j_state_lock);
goto repeat;
}
/* OK, account for the buffers that this operation expects to
@@ -250,7 +256,7 @@ repeat_locked:
atomic_read(&transaction->t_outstanding_credits),
__jbd2_log_space_left(journal));
spin_unlock(&transaction->t_handle_lock);
spin_unlock(&journal->j_state_lock);
read_unlock(&journal->j_state_lock);
lock_map_acquire(&handle->h_lockdep_map);
kfree(new_transaction);
@@ -362,7 +368,7 @@ int jbd2_journal_extend(handle_t *handle, int nblocks)
result = 1;
spin_lock(&journal->j_state_lock);
read_lock(&journal->j_state_lock);
/* Don't extend a locked-down transaction! */
if (handle->h_transaction->t_state != T_RUNNING) {
@@ -394,7 +400,7 @@ int jbd2_journal_extend(handle_t *handle, int nblocks)
unlock:
spin_unlock(&transaction->t_handle_lock);
error_out:
spin_unlock(&journal->j_state_lock);
read_unlock(&journal->j_state_lock);
out:
return result;
}
@@ -432,7 +438,7 @@ int jbd2__journal_restart(handle_t *handle, int nblocks, int gfp_mask)
J_ASSERT(atomic_read(&transaction->t_updates) > 0);
J_ASSERT(journal_current_handle() == handle);
spin_lock(&journal->j_state_lock);
read_lock(&journal->j_state_lock);
spin_lock(&transaction->t_handle_lock);
atomic_sub(handle->h_buffer_credits,
&transaction->t_outstanding_credits);
@@ -442,7 +448,7 @@ int jbd2__journal_restart(handle_t *handle, int nblocks, int gfp_mask)
jbd_debug(2, "restarting handle %p\n", handle);
__jbd2_log_start_commit(journal, transaction->t_tid);
spin_unlock(&journal->j_state_lock);
read_unlock(&journal->j_state_lock);
lock_map_release(&handle->h_lockdep_map);
handle->h_buffer_credits = nblocks;
@@ -472,7 +478,7 @@ void jbd2_journal_lock_updates(journal_t *journal)
{
DEFINE_WAIT(wait);
spin_lock(&journal->j_state_lock);
write_lock(&journal->j_state_lock);
++journal->j_barrier_count;
/* Wait until there are no running updates */
@@ -490,12 +496,12 @@ void jbd2_journal_lock_updates(journal_t *journal)
prepare_to_wait(&journal->j_wait_updates, &wait,
TASK_UNINTERRUPTIBLE);
spin_unlock(&transaction->t_handle_lock);
spin_unlock(&journal->j_state_lock);
write_unlock(&journal->j_state_lock);
schedule();
finish_wait(&journal->j_wait_updates, &wait);
spin_lock(&journal->j_state_lock);
write_lock(&journal->j_state_lock);
}
spin_unlock(&journal->j_state_lock);
write_unlock(&journal->j_state_lock);
/*
* We have now established a barrier against other normal updates, but
@@ -519,9 +525,9 @@ void jbd2_journal_unlock_updates (journal_t *journal)
J_ASSERT(journal->j_barrier_count != 0);
mutex_unlock(&journal->j_barrier);
spin_lock(&journal->j_state_lock);
write_lock(&journal->j_state_lock);
--journal->j_barrier_count;
spin_unlock(&journal->j_state_lock);
write_unlock(&journal->j_state_lock);
wake_up(&journal->j_wait_transaction_locked);
}
@@ -1314,9 +1320,9 @@ int jbd2_journal_stop(handle_t *handle)
journal->j_last_sync_writer = pid;
spin_lock(&journal->j_state_lock);
read_lock(&journal->j_state_lock);
commit_time = journal->j_average_commit_time;
spin_unlock(&journal->j_state_lock);
read_unlock(&journal->j_state_lock);
trans_time = ktime_to_ns(ktime_sub(ktime_get(),
transaction->t_start_time));
@@ -1748,7 +1754,7 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh)
goto zap_buffer_unlocked;
/* OK, we have data buffer in journaled mode */
spin_lock(&journal->j_state_lock);
write_lock(&journal->j_state_lock);
jbd_lock_bh_state(bh);
spin_lock(&journal->j_list_lock);
@@ -1801,7 +1807,7 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh)
jbd2_journal_put_journal_head(jh);
spin_unlock(&journal->j_list_lock);
jbd_unlock_bh_state(bh);
spin_unlock(&journal->j_state_lock);
write_unlock(&journal->j_state_lock);
return ret;
} else {
/* There is no currently-running transaction. So the
@@ -1815,7 +1821,7 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh)
jbd2_journal_put_journal_head(jh);
spin_unlock(&journal->j_list_lock);
jbd_unlock_bh_state(bh);
spin_unlock(&journal->j_state_lock);
write_unlock(&journal->j_state_lock);
return ret;
} else {
/* The orphan record's transaction has
@@ -1839,7 +1845,7 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh)
jbd2_journal_put_journal_head(jh);
spin_unlock(&journal->j_list_lock);
jbd_unlock_bh_state(bh);
spin_unlock(&journal->j_state_lock);
write_unlock(&journal->j_state_lock);
return 0;
} else {
/* Good, the buffer belongs to the running transaction.
@@ -1858,7 +1864,7 @@ zap_buffer:
zap_buffer_no_jh:
spin_unlock(&journal->j_list_lock);
jbd_unlock_bh_state(bh);
spin_unlock(&journal->j_state_lock);
write_unlock(&journal->j_state_lock);
zap_buffer_unlocked:
clear_buffer_dirty(bh);
J_ASSERT_BH(bh, !buffer_jbddirty(bh));
@@ -2165,9 +2171,9 @@ int jbd2_journal_begin_ordered_truncate(journal_t *journal,
/* Locks are here just to force reading of recent values, it is
* enough that the transaction was not committing before we started
* a transaction adding the inode to orphan list */
spin_lock(&journal->j_state_lock);
read_lock(&journal->j_state_lock);
commit_trans = journal->j_committing_transaction;
spin_unlock(&journal->j_state_lock);
read_unlock(&journal->j_state_lock);
spin_lock(&journal->j_list_lock);
inode_trans = jinode->i_transaction;
spin_unlock(&journal->j_list_lock);