linux-kernel - [PATCH v2] f2fs: turn down IO priority of discard from background

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Message-ID: <20180410074309.13531-1-yuchao0@huawei.com>
Date:   Tue, 10 Apr 2018 15:43:09 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH v2] f2fs: turn down IO priority of discard from background

In order to avoid interfering normal r/w IO, let's turn down IO
priority of discard issued from background.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
v2:
- correct commit message.
 fs/f2fs/segment.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index aabe0d6b8307..5e708debeb9c 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1723,6 +1723,7 @@ void init_discard_policy(struct discard_policy *dpolicy,
 		dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
 		dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
 		dpolicy->io_aware = true;
+		dpolicy->sync = false;
 	} else if (discard_type == DPOLICY_FORCE) {
 		dpolicy->min_interval = DEF_MIN_DISCARD_ISSUE_TIME;
 		dpolicy->max_interval = DEF_MAX_DISCARD_ISSUE_TIME;
-- 
2.15.0.55.gc2ece9dc4de6