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?
> >
> > 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);
> > }
> > }
> >
> >
