Hello,
On 12/01, Hyunchul Lee wrote:
> 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@xxxxxxx>
> >>>
> >>> 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.
Same in what way?
WRITE_LIFE_NOT_SET = 0,
WRITE_LIFE_NONE = 1,
Still, you didn't answer why we have to assign LIFE_NONE to WARM_DATA?
Thanks,
>
> Thanks.
>
> >>>
> >>> Many thanks to Chao Yu and Jaegeuk Kim for comments to
> >>> implement this patch.
> >>>
> >>> Signed-off-by: Hyunchul Lee <cheol.lee@xxxxxxx>
> >>> ---
> >>> 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);
> >>> }
> >>> }
> >>>
> >>>
> >
