linux-kernel - Re: [PATCH] Allow 0ms deadline latency

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Date:	Sun, 09 Dec 2012 19:18:53 +0100
From:	Jens Axboe <axboe@...nel.dk>
To:	xtu4 <xiaobing.tu@...el.com>
CC:	linux-kernel@...r.kernel.org, di.zhang@...el.com
Subject: Re: [PATCH] Allow 0ms deadline latency

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@...el.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

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