From: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Date: Tue, 15 Dec 2009 09:08:45 +0000 (+0100)
Subject: cfq: set workload as expired if it doesn't have any slice left
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=66ae291978177d5c012015f12b8fbc76dc7d0965;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

cfq: set workload as expired if it doesn't have any slice left

When a group is resumed, if it doesn't have workload slice left,
we should set workload_expires as expired. Otherwise, we might
start from where we left in previous group by error.
Thanks the idea from Corrado.

Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index f3f62394b986..e2f80463ed0d 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -2113,7 +2113,9 @@ static void cfq_choose_cfqg(struct cfq_data *cfqd)
 		cfqd->workload_expires = jiffies + cfqg->saved_workload_slice;
 		cfqd->serving_type = cfqg->saved_workload;
 		cfqd->serving_prio = cfqg->saved_serving_prio;
-	}
+	} else
+		cfqd->workload_expires = jiffies - 1;
+
 	choose_service_tree(cfqd, cfqg);
 }