Hi, Chao,
Not looks good to me, since there is some case your code does not include:
if type is CURSEG_HOT_DATA, and if get_victim also returns 0 for both CURSEG_HOT_DATA and
CURSEG_WARM_DATA, then i will be -1 and pass to get_victim in your code. So I still suggest
my original patch attached below.
On 2017/2/24 18:47, Chao Yu wrote:
> 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@xxxxxxxxxx>
>>>
>>> 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@xxxxxxxxxx>
>>>>> ---
>>>>> 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
