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| author | Theodore Ts'o <tytso@mit.edu> | 2014-03-09 04:34:10 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2014-03-09 04:34:10 +0100 |
| commit | d4e839d4a9dc31d0c229e616146b01e1ace56604 (patch) | |
| tree | 1a04beaeb6a438212db18548f5e0ff37b048f973 /fs/jbd2 | |
| parent | jbd2: calculate statistics without holding j_state_lock and j_list_lock (diff) | |
| download | linux-d4e839d4a9dc31d0c229e616146b01e1ace56604.tar.xz linux-d4e839d4a9dc31d0c229e616146b01e1ace56604.zip | |
jbd2: add transaction to checkpoint list earlier
We don't otherwise need j_list_lock during the rest of commit phase
#7, so add the transaction to the checkpoint list at the very end of
commit phase #6. This allows us to drop j_list_lock earlier, which is
a good thing since it is a super hot lock.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
| -rw-r--r-- | fs/jbd2/commit.c | 39 |
1 files changed, 20 insertions, 19 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c index af36252b5b2d..5f26139a165a 100644 --- a/fs/jbd2/commit.c +++ b/fs/jbd2/commit.c @@ -1065,6 +1065,25 @@ restart_loop: goto restart_loop; } + /* Add the transaction to the checkpoint list + * __journal_remove_checkpoint() can not destroy transaction + * under us because it is not marked as T_FINISHED yet */ + if (journal->j_checkpoint_transactions == NULL) { + journal->j_checkpoint_transactions = commit_transaction; + commit_transaction->t_cpnext = commit_transaction; + commit_transaction->t_cpprev = commit_transaction; + } else { + commit_transaction->t_cpnext = + journal->j_checkpoint_transactions; + commit_transaction->t_cpprev = + commit_transaction->t_cpnext->t_cpprev; + commit_transaction->t_cpnext->t_cpprev = + commit_transaction; + commit_transaction->t_cpprev->t_cpnext = + commit_transaction; + } + spin_unlock(&journal->j_list_lock); + /* Done with this transaction! */ jbd_debug(3, "JBD2: commit phase 7\n"); @@ -1103,24 +1122,6 @@ restart_loop: write_unlock(&journal->j_state_lock); - if (journal->j_checkpoint_transactions == NULL) { - journal->j_checkpoint_transactions = commit_transaction; - commit_transaction->t_cpnext = commit_transaction; - commit_transaction->t_cpprev = commit_transaction; - } else { - commit_transaction->t_cpnext = - journal->j_checkpoint_transactions; - commit_transaction->t_cpprev = - commit_transaction->t_cpnext->t_cpprev; - commit_transaction->t_cpnext->t_cpprev = - commit_transaction; - commit_transaction->t_cpprev->t_cpnext = - commit_transaction; - } - spin_unlock(&journal->j_list_lock); - /* Drop all spin_locks because commit_callback may be block. - * __journal_remove_checkpoint() can not destroy transaction - * under us because it is not marked as T_FINISHED yet */ if (journal->j_commit_callback) journal->j_commit_callback(journal, commit_transaction); @@ -1131,7 +1132,7 @@ restart_loop: write_lock(&journal->j_state_lock); spin_lock(&journal->j_list_lock); commit_transaction->t_state = T_FINISHED; - /* Recheck checkpoint lists after j_list_lock was dropped */ + /* Check if the transaction can be dropped now that we are finished */ if (commit_transaction->t_checkpoint_list == NULL && commit_transaction->t_checkpoint_io_list == NULL) { __jbd2_journal_drop_transaction(journal, commit_transaction); |