linux-ext4 - [PATCH] jbd2: wake up j_wait_done

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1466048728-4325-1-git-send-email-wangshilong1991@gmail.com>
Date:	Thu, 16 Jun 2016 12:45:28 +0900
From:	Wang Shilong <wangshilong1991@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: [PATCH] jbd2: wake up j_wait_done_commit before commit callback

From: Wang Shilong <wshilong@....com>

Lustre register some callbacks in ext4 to keep data consistency,
we see millons callbacks possibility on MDS for metadata operations.

If there are many commit callbacks which might take some cpu
time, we can mark commit done before we call commit callback.
this can relax some thread waiting for commit finished, for example
transaction throttle in end transaction.

Signed-off-by: Wang Shilong <wshilong@....com>
---
 fs/jbd2/commit.c |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 7007809..a9cf5a4 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -379,6 +379,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
 	tid_t first_tid;
 	int update_tail;
 	int csum_size = 0;
+	int need_free = 0;
 	LIST_HEAD(io_bufs);
 	LIST_HEAD(log_bufs);
 
@@ -1100,9 +1101,6 @@ restart_loop:
 
 	write_unlock(&journal->j_state_lock);
 
-	if (journal->j_commit_callback)
-		journal->j_commit_callback(journal, commit_transaction);
-
 	trace_jbd2_end_commit(journal, commit_transaction);
 	jbd_debug(1, "JBD2: commit %d complete, head %d\n",
 		  journal->j_commit_sequence, journal->j_tail_sequence);
@@ -1114,12 +1112,18 @@ restart_loop:
 	if (commit_transaction->t_checkpoint_list == NULL &&
 	    commit_transaction->t_checkpoint_io_list == NULL) {
 		__jbd2_journal_drop_transaction(journal, commit_transaction);
-		jbd2_journal_free_transaction(commit_transaction);
+		need_free = 1;
 	}
 	spin_unlock(&journal->j_list_lock);
 	write_unlock(&journal->j_state_lock);
 	wake_up(&journal->j_wait_done_commit);
 
+	if (journal->j_commit_callback)
+		journal->j_commit_callback(journal, commit_transaction);
+
+	if (need_free)
+		jbd2_journal_free_transaction(commit_transaction);
+
 	/*
 	 * Calculate overall stats
 	 */
-- 
1.7.1

--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html