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jbd2: wake up journal waiters in FIFO order, not LIFO

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LIFO wakeup order is unfair and sometimes leads to a journal
user not being able to get a journal handle for hundreds of
transactions in a row.

FIFO wakeup can make things more fair.

Cc: stable@kernel.org
Signed-off-by: Alexey Lyashkov <alexey.lyashkov@gmail.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://lore.kernel.org/r/20220907165959.1137482-1-alexey.lyashkov@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Andrew Perepechko 2022-09-07 19:59:59 +03:00 committed by Theodore Ts'o
parent d1052d236e
commit 34fc8768ec
2 changed files with 4 additions and 4 deletions
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2
fs/jbd2/commit.c
View File

@ -568,7 +568,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
journal->j_running_transaction = NULL;
start_time = ktime_get();
commit_transaction->t_log_start = journal->j_head;
wake_up(&journal->j_wait_transaction_locked);
wake_up_all(&journal->j_wait_transaction_locked);
write_unlock(&journal->j_state_lock);
jbd2_debug(3, "JBD2: commit phase 2a\n");

6
fs/jbd2/transaction.c
View File

@ -168,7 +168,7 @@ static void wait_transaction_locked(journal_t *journal)
int need_to_start;
tid_t tid = journal->j_running_transaction->t_tid;
prepare_to_wait(&journal->j_wait_transaction_locked, &wait,
prepare_to_wait_exclusive(&journal->j_wait_transaction_locked, &wait,
TASK_UNINTERRUPTIBLE);
need_to_start = !tid_geq(journal->j_commit_request, tid);
read_unlock(&journal->j_state_lock);
@ -194,7 +194,7 @@ static void wait_transaction_switching(journal_t *journal)
read_unlock(&journal->j_state_lock);
return;
}
prepare_to_wait(&journal->j_wait_transaction_locked, &wait,
prepare_to_wait_exclusive(&journal->j_wait_transaction_locked, &wait,
TASK_UNINTERRUPTIBLE);
read_unlock(&journal->j_state_lock);
/*
@ -920,7 +920,7 @@ void jbd2_journal_unlock_updates (journal_t *journal)
write_lock(&journal->j_state_lock);
--journal->j_barrier_count;
write_unlock(&journal->j_state_lock);
wake_up(&journal->j_wait_transaction_locked);
wake_up_all(&journal->j_wait_transaction_locked);
}
static void warn_dirty_buffer(struct buffer_head *bh)