[PATCHv2,REBASED,2/2] jbd2: Remove CONFIG_JBD2_DEBUG to update t_max_wait

Commit Message

Ritesh Harjani Feb. 16, 2022, 7 a.m. UTC

CONFIG_JBD2_DEBUG and jbd2_journal_enable_debug knobs were added in
update_t_max_wait(), since earlier it used to take a spinlock for updating
t_max_wait, which could cause a bottleneck while starting a txn
(start_this_handle()).
Since in previous patch, we have killed t_handle_lock completely, we
could get rid of this debug config and knob to let t_max_wait be updated
by default again.

Signed-off-by: Ritesh Harjani <[e-mail]>
Reviewed-by: Jan Kara <[e-mail]>
---
 fs/jbd2/transaction.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

Patch

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 83801a8be078..73ed02f061e1 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -141,20 +141,19 @@  static void jbd2_get_transaction(journal_t *journal,
  * t_max_wait is carefully updated here with use of atomic compare exchange.
  * Note that there could be multiplre threads trying to do this simultaneously
  * hence using cmpxchg to avoid any use of locks in this case.
+ * With this t_max_wait can be updated w/o enabling jbd2_journal_enable_debug.
  */
 static inline void update_t_max_wait(transaction_t *transaction,
 				     unsigned long ts)
 {
-#ifdef CONFIG_JBD2_DEBUG
 	unsigned long oldts, newts;
-	if (jbd2_journal_enable_debug &&
-	    time_after(transaction->t_start, ts)) {
+
+	if (time_after(transaction->t_start, ts)) {
 		newts = jbd2_time_diff(ts, transaction->t_start);
 		oldts = READ_ONCE(transaction->t_max_wait);
 		while (oldts < newts)
 			oldts = cmpxchg(&transaction->t_max_wait, oldts, newts);
 	}
-#endif
 }
 
 /*