linux-kernel - Re: [PATCH 3/3] f2fs: provide more chance for node and data to get ssr segment

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Date:   Fri, 24 Feb 2017 18:47:37 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Yunlong Song <yunlong.song@...wei.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>
CC:     <chao@...nel.org>, <sylinux@....com>, <miaoxie@...wei.com>,
        <bintian.wang@...wei.com>, <linux-fsdevel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] f2fs: provide more chance for node and data to get
 ssr segment

On 2017/2/24 17:19, Yunlong Song wrote:
> Hi Jaegeuk and Chao,
> 
>     How about the question I pointed out in last mail:
>     Why not take "neighboring temperature" for ssr? For example, if type == CURSEG_COLD_DATA,
>     the new patch selects CURSEG_HOT_DATA first, why not select CURSEG_WARM_DATA first?
>     The patch I sent ensure this "neighboring temperature" for ssr. This is to reduce the influence of
>     mixing different levels of hot/code node types.

Agreed, I sent one patch for changing the policy of SSR, how do you think of it?

Thanks,

> 
> On 2017/2/24 17:05, Chao Yu wrote:
>> Hi Jaegeuk,
>>
>> Reviewed-by: Chao Yu <yuchao0@...wei.com>
>>
>> For your attached two patches.
>>
>> Thanks,
>>
>> On 2017/2/23 9:17, Jaegeuk Kim wrote:
>>> Hi Yunlong,
>>>
>>> I've been testing the similar patches as I attached.
>>>
>>> Thanks,
>>>
>>> On 02/22, Yunlong Song wrote:
>>>> Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
>>>> ---
>>>>  fs/f2fs/segment.c | 9 +++++++++
>>>>  1 file changed, 9 insertions(+)
>>>>
>>>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>>>> index 9d13743..5fe71b9 100644
>>>> --- a/fs/f2fs/segment.c
>>>> +++ b/fs/f2fs/segment.c
>>>> @@ -1540,12 +1540,17 @@ static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
>>>>  {
>>>>  	struct curseg_info *curseg = CURSEG_I(sbi, type);
>>>>  	const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;
>>>> +	int old_type = type;
>>>>  
>>>>  	if (IS_NODESEG(type)) {
>>>>  		for (; type >= CURSEG_HOT_NODE; type--)
>>>>  			if (v_ops->get_victim(sbi, &(curseg)->next_segno,
>>>>  							BG_GC, type, SSR))
>>>>  				return 1;
>>>> +		for (type = old_type + 1; type <= CURSEG_COLD_NODE; type++)
>>>> +			if (v_ops->get_victim(sbi, &(curseg)->next_segno,
>>>> +							BG_GC, type, SSR))
>>>> +				return 1;
>>>>  		return 0;
>>>>  	}
>>>>  
>>>> @@ -1554,6 +1559,10 @@ static int get_ssr_segment(struct f2fs_sb_info *sbi, int type)
>>>>  		if (v_ops->get_victim(sbi, &(curseg)->next_segno,
>>>>  						BG_GC, type, SSR))
>>>>  			return 1;
>>>> +	for (type = old_type + 1; type <= CURSEG_COLD_DATA; type++)
>>>> +		if (v_ops->get_victim(sbi, &(curseg)->next_segno,
>>>> +						BG_GC, type, SSR))
>>>> +			return 1;
>>>>  	return 0;
>>>>  }
>>>>  
>>>> -- 
>>>> 1.8.5.2
>>
>> .
>>
> 
>