From 2d4429205882817100e5e88870ce0663d30c77af Mon Sep 17 00:00:00 2001 From: Ritesh Harjani Date: Wed, 16 Feb 2022 12:30:36 +0530 Subject: jbd2: remove CONFIG_JBD2_DEBUG to update t_max_wait 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 Reviewed-by: Jan Kara Link: https://lore.kernel.org/r/ad7319a601fd501079310747ce87d908e0944763.1644992076.git.riteshh@linux.ibm.com Signed-off-by: Theodore Ts'o --- fs/jbd2/transaction.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'fs/jbd2') 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 } /* -- cgit v1.2.3