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Date:   Thu, 23 Feb 2017 10:13:01 +0800
From:   Yunlong Song <yunlong.song@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
CC:     <cm224.lee@...sung.com>, <yuchao0@...wei.com>, <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

Hi Jay,
    But there are some differences:
1 Why not take "neighboring temperature" for ssr? For example, if type == CURSEG_COLD_DATA,
    your new patch selects CURSEG_HOT_DATA first, how about select CURSEG_WARM_DATA first?
    The patch I sent ensure this "neighboring temperature" for ssr.
2 Your new patch returns 0 for node ssr, does get_ssr_segment work only for data?
3 I see your new patch just "continue" when i == type, why not consider the current type?

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


-- 
Thanks,
Yunlong Song


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