* [PATCH] Allow 0ms deadline latency
@ 2012-12-09 16:01 xtu4
2012-12-09 16:02 ` xtu4
0 siblings, 1 reply; 3+ messages in thread
From: xtu4 @ 2012-12-09 16:01 UTC (permalink / raw)
To: linux-kernel, 'axboe, di.zhang, xtu4
Subject: [PATCH] Allow 0ms deadline latency, increase the read speed
Signed-off-by: xiaobing tu <xiaobing.tu@intel.com>
---
block/deadline-iosched.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c
index c644137..e502d6b 100644
--- a/block/deadline-iosched.c
+++ b/block/deadline-iosched.c
@@ -230,7 +230,7 @@ static inline int deadline_check_fifo(struct
deadline_data *dd, int ddir)
/*
* rq is expired!
*/
- if (time_after(jiffies, rq_fifo_time(rq)))
+ if (time_after_eq(jiffies, rq_fifo_time(rq)))
return 1;
return 0;
--
1.7.6
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] Allow 0ms deadline latency
2012-12-09 16:01 [PATCH] Allow 0ms deadline latency xtu4
@ 2012-12-09 16:02 ` xtu4
2012-12-09 18:18 ` Jens Axboe
0 siblings, 1 reply; 3+ messages in thread
From: xtu4 @ 2012-12-09 16:02 UTC (permalink / raw)
To: xtu4; +Cc: linux-kernel, axboe, di.zhang
re-send it
On 12/10/2012 12:01 AM, xtu4 wrote:
> Subject: [PATCH] Allow 0ms deadline latency, increase the read speed
>
> Signed-off-by: xiaobing tu <xiaobing.tu@intel.com>
> ---
> block/deadline-iosched.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c
> index c644137..e502d6b 100644
> --- a/block/deadline-iosched.c
> +++ b/block/deadline-iosched.c
> @@ -230,7 +230,7 @@ static inline int deadline_check_fifo(struct
> deadline_data *dd, int ddir)
> /*
> * rq is expired!
> */
> - if (time_after(jiffies, rq_fifo_time(rq)))
> + if (time_after_eq(jiffies, rq_fifo_time(rq)))
> return 1;
>
> return 0;
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] Allow 0ms deadline latency
2012-12-09 16:02 ` xtu4
@ 2012-12-09 18:18 ` Jens Axboe
0 siblings, 0 replies; 3+ messages in thread
From: Jens Axboe @ 2012-12-09 18:18 UTC (permalink / raw)
To: xtu4; +Cc: linux-kernel, di.zhang
On 2012-12-09 17:02, xtu4 wrote:
> On 12/10/2012 12:01 AM, xtu4 wrote:
>> Subject: [PATCH] Allow 0ms deadline latency, increase the read speed
>>
>> Signed-off-by: xiaobing tu <xiaobing.tu@intel.com>
>> ---
>> block/deadline-iosched.c | 2 +-
>> 1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c
>> index c644137..e502d6b 100644
>> --- a/block/deadline-iosched.c
>> +++ b/block/deadline-iosched.c
>> @@ -230,7 +230,7 @@ static inline int deadline_check_fifo(struct
>> deadline_data *dd, int ddir)
>> /*
>> * rq is expired!
>> */
>> - if (time_after(jiffies, rq_fifo_time(rq)))
>> + if (time_after_eq(jiffies, rq_fifo_time(rq)))
>> return 1;
>>
>> return 0;
Looks fine, it allows FIFO behaviour for deadline as well. I have
applied it.
--
Jens Axboe
^ permalink raw reply [flat|nested] 3+ messages in thread
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2012-12-09 16:01 [PATCH] Allow 0ms deadline latency xtu4
2012-12-09 16:02 ` xtu4
2012-12-09 18:18 ` Jens Axboe
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