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SubjectRe: [PATCH 1/2] f2fs: pass down write hints to block layer for bufferd write
Hi Jaegeuk,

On 12/01/2017 04:28 PM, Jaegeuk Kim wrote:
> On 11/30, Chao Yu wrote:
>> On 2017/11/28 8:23, Hyunchul Lee wrote:
>>> From: Hyunchul Lee <cheol.lee@lge.com>
>>>
>>> This implements which hint is passed down to block layer
>>> for datas from the specific segment type.
>>>
>>> segment type hints
>>> ------------ -----
>>> COLD_NODE & COLD_DATA WRITE_LIFE_EXTREME
>>> WARM_DATA WRITE_LIFE_NONE
>>> HOT_NODE & WARM_NODE WRITE_LIFE_LONG
>>> HOT_DATA WRITE_LIFE_MEDIUM
>>> META_DATA WRITE_LIFE_SHORT
>>
>> The correspondence looks good to me.
>
> Still, I don't fully get the point. Why do we have to assign WRITE_LIFE_NONE
> to WARM_DATA? Why not using WRITE_LIFE_NOT_SET?
>

I think LIFE_NONE and LIFE_NOT_SET are the same. So I chose LIFE_NONE simply.

Thanks.

>>>
>>> Many thanks to Chao Yu and Jaegeuk Kim for comments to
>>> implement this patch.
>>>
>>> Signed-off-by: Hyunchul Lee <cheol.lee@lge.com>
>>> ---
>>> fs/f2fs/data.c | 1 +
>>> fs/f2fs/f2fs.h | 2 ++
>>> fs/f2fs/segment.c | 29 +++++++++++++++++++++++++++++
>>> fs/f2fs/super.c | 2 ++
>>> 4 files changed, 34 insertions(+)
>>>
>>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>>> index a7ae418..0919a43 100644
>>> --- a/fs/f2fs/data.c
>>> +++ b/fs/f2fs/data.c
>>> @@ -437,6 +437,7 @@ int f2fs_submit_page_write(struct f2fs_io_info *fio)
>>> }
>>> io->bio = __bio_alloc(sbi, fio->new_blkaddr,
>>> BIO_MAX_PAGES, false);
>>> + io->bio->bi_write_hint = io->write_hint;
>>
>> Need to assign bi_write_hint for IPU path?
>>
>> - rewrite_data_page
>> - f2fs_submit_page_bio
>>
>>> io->fio = *fio;
>>> }
>>>
>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>>> index 7bcd148..be3cb0c 100644
>>> --- a/fs/f2fs/f2fs.h
>>> +++ b/fs/f2fs/f2fs.h
>>> @@ -969,6 +969,7 @@ struct f2fs_bio_info {
>>> struct rw_semaphore io_rwsem; /* blocking op for bio */
>>> spinlock_t io_lock; /* serialize DATA/NODE IOs */
>>> struct list_head io_list; /* track fios */
>>> + enum rw_hint write_hint;
>>
>> Add missing comment?
>>
>>> };
>>>
>>> #define FDEV(i) (sbi->devs[i])
>>> @@ -2674,6 +2675,7 @@ int lookup_journal_in_cursum(struct f2fs_journal *journal, int type,
>>> int __init create_segment_manager_caches(void);
>>> void destroy_segment_manager_caches(void);
>>> int rw_hint_to_seg_type(enum rw_hint hint);
>>> +enum rw_hint io_type_to_rw_hint(enum page_type page, enum temp_type temp);
>>>
>>> /*
>>> * checkpoint.c
>>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>>> index c117e09..0570db7 100644
>>> --- a/fs/f2fs/segment.c
>>> +++ b/fs/f2fs/segment.c
>>> @@ -2446,6 +2446,35 @@ int rw_hint_to_seg_type(enum rw_hint hint)
>>> }
>>> }
>>>
>>
>> It will be better to copy commit log here to declare correspondence
>> more clearly.
>>
>> Thanks,
>>
>>> +enum rw_hint io_type_to_rw_hint(enum page_type page, enum temp_type temp)
>>> +{
>>> + if (page == DATA) {
>>> + switch (temp) {
>>> + case WARM:
>>> + return WRITE_LIFE_NONE;
>>> + case COLD:
>>> + return WRITE_LIFE_EXTREME;
>>> + case HOT:
>>> + return WRITE_LIFE_MEDIUM;
>>> + default:
>>> + return WRITE_LIFE_NOT_SET;
>>> + }
>>> + } else if (page == NODE) {
>>> + switch (temp) {
>>> + case WARM:
>>> + case HOT:
>>> + return WRITE_LIFE_LONG;
>>> + case COLD:
>>> + return WRITE_LIFE_EXTREME;
>>> + default:
>>> + return WRITE_LIFE_NOT_SET;
>>> + }
>>> +
>>> + } else {
>>> + return WRITE_LIFE_SHORT;
>>> + }
>>> +}
>>> +
>>> static int __get_segment_type_2(struct f2fs_io_info *fio)
>>> {
>>> if (fio->type == DATA)
>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>>> index a6c5dd4..51c19a0 100644
>>> --- a/fs/f2fs/super.c
>>> +++ b/fs/f2fs/super.c
>>> @@ -2508,6 +2508,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>>> sbi->write_io[i][j].bio = NULL;
>>> spin_lock_init(&sbi->write_io[i][j].io_lock);
>>> INIT_LIST_HEAD(&sbi->write_io[i][j].io_list);
>>> + sbi->write_io[i][j].write_hint =
>>> + io_type_to_rw_hint(i, j);
>>> }
>>> }
>>>
>>>
>

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