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SubjectRe: [PATCH] f2fs: fix heap mode to reset it back
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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, :)

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@huawei.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])
>>>
>>
>> .
>>
>

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