Viewing: ext4-jcb-optimization.patch
commit 55afbf5934e145e48a31193de601abd58e605a42
Author: Sergey Cheremencev <c17829@cray.com>
AuthorDate: Wed Apr 8 22:18:07 2015 +0300
LU-6527 ext4: journal_commit_callback optimization
Don't take spinlock in tgt_cb_last_committed, if
exp_last_committed was updated with higher trasno.
Also change list_add_tail to list_add. It gives
advantages to ldiskfs in tgt_cb_last_committed.
In the beginning of list will be placed thandles
with the highest transaction numbers. So at the
first iterations we will have the highest transno.
It will save from extra call of
ptlrpc_commit_replies.
Signed-off-by: Sergey Cheremencev <sergey.cheremencev@seagate.com>
Xyratex-bug-id: MRP-2575
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@seagate.com>
Reviewed-by: Alexander Boyko <alexander.boyko@seagate.com>
Tested-by: Alexander Lezhoev <alexander.lezhoev@seagate.com>
Reviewed-by: Alexey Leonidovich Lyashkov <alexey.lyashkov@seagate.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Change-Id: Ib6f9cc54dae7d9ac1ca301402299f308b825ede4
Reviewed-on: http://es-gerrit.xyus.xyratex.com:8080/5907
Reviewed-on: http://review.whamcloud.com/14611
Index: linux-4.15.0/fs/ext4/ext4_jbd2.h
===================================================================
--- linux-4.15.0.orig/fs/ext4/ext4_jbd2.h
+++ linux-4.15.0/fs/ext4/ext4_jbd2.h
@@ -172,7 +172,7 @@ static inline void _ext4_journal_callbac
struct ext4_journal_cb_entry *jce)
{
/* Add the jce to transaction's private list */
- list_add_tail(&jce->jce_list, &handle->h_transaction->t_private_list);
+ list_add(&jce->jce_list, &handle->h_transaction->t_private_list);
}
static inline void ext4_journal_callback_add(handle_t *handle,
