linux-kernel - Re: [PATCH] f2fs: fix heap mode to reset it back

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Date:   Wed, 31 Jan 2018 10:19:42 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
CC:     Yunlong Song <yunlong.song@...wei.com>, <chao@...nel.org>,
        <yunlong.song@...oud.com>, <miaoxie@...wei.com>,
        <bintian.wang@...wei.com>, <shengyong1@...wei.com>,
        <heyunlei@...wei.com>, <linux-fsdevel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] f2fs: fix heap mode to reset it back

On 2018/1/31 9:39, Jaegeuk Kim wrote:
> On 01/29, Chao Yu wrote:
>> On 2018/1/29 16:31, Yunlong Song wrote:
>>> The old commit allocates hot data & nodes in the beginning of partition 
>>> both for heap and
>>> noheap mode. But from the commit message, the heap mode should be like 
>>> before, i.e.,
>>> allocate hot data & nodes from curseg to left.
>>
>> Let's ping Jaegeuk to check that, :)
> 
> Yup, I missed to add this condition. :)

Alright, if so, it needs to Cc stable mailing list, as this patch should
fix to reset back allocation policy of heap mode in old kernel too.

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,

> 
>>
>> Thanks,
>>
>>>
>>> On 2018/1/29 16:12, Chao Yu wrote:
>>>> Hi Yunlong,
>>>>
>>>> On 2018/1/29 11:37, Yunlong Song wrote:
>>>>> Commit 7a20b8a61eff81bdb7097a578752a74860e9d142 ("f2fs: allocate node
>>>>> and hot data in the beginning of partition") introduces another mount
>>>>> option, heap, to reset it back. But it does not do anything for heap
>>>>> mode, so fix it.
>>>> I think Jaegeuk did three things in that patch:
>>>> a) add missing heap mount option handling in ->show_options.
>>>> b) set noheap by default.
>>>> c) change allocation policy to the one that allocate hotdata & nodes in the
>>>> front of main are intensively.
>>>>
>>>> They could be separated, independent, and I don't see such intention that
>>>> we can only use c) the new introduced allocation policy in noheap mode.
>>>>
>>>> Anyway, I think Jaegeuk can help to double check that.
>>>>
>>>> Thanks,
>>>>
>>>>> Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
>>>>> ---
>>>>>   fs/f2fs/gc.c      | 5 +++--
>>>>>   fs/f2fs/segment.c | 3 ++-
>>>>>   2 files changed, 5 insertions(+), 3 deletions(-)
>>>>>
>>>>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
>>>>> index aa720cc..b9d93fd 100644
>>>>> --- a/fs/f2fs/gc.c
>>>>> +++ b/fs/f2fs/gc.c
>>>>> @@ -191,8 +191,9 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
>>>>>   	if (gc_type != FG_GC && p->max_search > sbi->max_victim_search)
>>>>>   		p->max_search = sbi->max_victim_search;
>>>>>   
>>>>> -	/* let's select beginning hot/small space first */
>>>>> -	if (type == CURSEG_HOT_DATA || IS_NODESEG(type))
>>>>> +	/* let's select beginning hot/small space first in no_heap mode*/
>>>>> +	if (test_opt(sbi, NOHEAP) &&
>>>>> +		(type == CURSEG_HOT_DATA || IS_NODESEG(type)))
>>>>>   		p->offset = 0;
>>>>>   	else
>>>>>   		p->offset = SIT_I(sbi)->last_victim[p->gc_mode];
>>>>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>>>>> index e5739ce..77a48c4 100644
>>>>> --- a/fs/f2fs/segment.c
>>>>> +++ b/fs/f2fs/segment.c
>>>>> @@ -2167,7 +2167,8 @@ static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
>>>>>   	if (sbi->segs_per_sec != 1)
>>>>>   		return CURSEG_I(sbi, type)->segno;
>>>>>   
>>>>> -	if (type == CURSEG_HOT_DATA || IS_NODESEG(type))
>>>>> +	if (test_opt(sbi, NOHEAP) &&
>>>>> +		(type == CURSEG_HOT_DATA || IS_NODESEG(type)))
>>>>>   		return 0;
>>>>>   
>>>>>   	if (SIT_I(sbi)->last_victim[ALLOC_NEXT])
>>>>>
>>>>
>>>> .
>>>>
>>>
> 
> .
>