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Message-Id: <1371774534-4139-2-git-send-email-liwanp@linux.vnet.ibm.com>
Date: Fri, 21 Jun 2013 08:28:50 +0800
From: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Michal Hocko <mhocko@...e.cz>,
David Rientjes <rientjes@...gle.com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Fengguang Wu <fengguang.wu@...el.com>,
Rik van Riel <riel@...hat.com>,
Andrew Shewmaker <agshew@...il.com>,
Jiri Kosina <jkosina@...e.cz>,
Namjae Jeon <linkinjeon@...il.com>, Jan Kara <jack@...e.cz>,
Tejun Heo <tj@...nel.org>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Subject: [PATCH v5 2/6] mm/writeback: Don't check force_wait to handle bdi->work_list
After commit 839a8e86("writeback: replace custom worker pool implementation
with unbound workqueue"), bdi_writeback_workfn runs off bdi_writeback->dwork,
on each execution, it processes bdi->work_list and reschedules if there are
more things to do instead of flush any work that race with us existing. It is
unecessary to check force_wait in wb_do_writeback since it is always 0 after
the mentioned commit. This patch remove the force_wait in wb_do_writeback.
Reviewed-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
---
fs/fs-writeback.c | 10 ++--------
1 files changed, 2 insertions(+), 8 deletions(-)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index f892dec..e15aa97 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -959,7 +959,7 @@ static long wb_check_old_data_flush(struct bdi_writeback *wb)
/*
* Retrieve work items and do the writeback they describe
*/
-static long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
+static long wb_do_writeback(struct bdi_writeback *wb)
{
struct backing_dev_info *bdi = wb->bdi;
struct wb_writeback_work *work;
@@ -967,12 +967,6 @@ static long wb_do_writeback(struct bdi_writeback *wb, int force_wait)
set_bit(BDI_writeback_running, &wb->bdi->state);
while ((work = get_next_work_item(bdi)) != NULL) {
- /*
- * Override sync mode, in case we must wait for completion
- * because this thread is exiting now.
- */
- if (force_wait)
- work->sync_mode = WB_SYNC_ALL;
trace_writeback_exec(bdi, work);
@@ -1021,7 +1015,7 @@ void bdi_writeback_workfn(struct work_struct *work)
* rescuer as work_list needs to be drained.
*/
do {
- pages_written = wb_do_writeback(wb, 0);
+ pages_written = wb_do_writeback(wb);
trace_writeback_pages_written(pages_written);
} while (!list_empty(&bdi->work_list));
} else {
--
1.7.5.4
--
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