On Wed, Jun 5, 2024 at 1:59 PM Zhiguo Niu <niuzhigu...@gmail.com> wrote: > > On Wed, Jun 5, 2024 at 11:48 AM Chao Yu <c...@kernel.org> wrote: > > > > On 2024/6/3 17:05, Zhiguo Niu wrote: > > > On Mon, Jun 3, 2024 at 3:41 PM Chao Yu <c...@kernel.org> wrote: > > >> > > >> On 2024/5/20 19:36, Zhiguo Niu wrote: > > >>> Now atgc can be enabled based on the following conditions: > > >>> -ATGC mount option is set > > >>> -elapsed_time is more than atgc_age_threshold already > > >>> but these conditions are check when umounted->mounted device again. > > >>> If the device has not be umounted->mounted for a long time, atgc can > > >>> not work even the above conditions met. > > >>> > > >>> It is better to enable atgc dynamiclly when user change > > >>> atgc_age_threshold > > >>> meanwhile this vale is less than elapsed_time and ATGC mount option is > > >>> on. > > >>> > > >>> Signed-off-by: Zhiguo Niu <zhiguo....@unisoc.com> > > >>> --- > > >>> fs/f2fs/f2fs.h | 1 + > > >>> fs/f2fs/segment.c | 9 ++++----- > > >>> fs/f2fs/sysfs.c | 16 ++++++++++++++++ > > >>> 3 files changed, 21 insertions(+), 5 deletions(-) > > >>> > > >>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > > >>> index 1974b6a..e441d2d 100644 > > >>> --- a/fs/f2fs/f2fs.h > > >>> +++ b/fs/f2fs/f2fs.h > > >>> @@ -3694,6 +3694,7 @@ void f2fs_clear_prefree_segments(struct > > >>> f2fs_sb_info *sbi, > > >>> int f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi); > > >>> void f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi); > > >>> void f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi); > > >>> +int f2fs_init_atgc_curseg(struct f2fs_sb_info *sbi); > > >>> int f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int > > >>> type, > > >>> unsigned int start, unsigned int > > >>> end); > > >>> int f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type, > > >>> bool force); > > >>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c > > >>> index 71dc8042..44923d4 100644 > > >>> --- a/fs/f2fs/segment.c > > >>> +++ b/fs/f2fs/segment.c > > >>> @@ -2931,14 +2931,11 @@ static int get_atssr_segment(struct > > >>> f2fs_sb_info *sbi, int type, > > >>> return ret; > > >>> } > > >>> > > >>> -static int __f2fs_init_atgc_curseg(struct f2fs_sb_info *sbi) > > >>> +int f2fs_init_atgc_curseg(struct f2fs_sb_info *sbi) > > >>> { > > >>> struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_ALL_DATA_ATGC); > > >>> int ret = 0; > > >>> > > >>> - if (!sbi->am.atgc_enabled) > > >>> - return 0; > > >>> - > > >>> f2fs_down_read(&SM_I(sbi)->curseg_lock); > > >>> > > >>> mutex_lock(&curseg->curseg_mutex); > > >>> @@ -2955,7 +2952,9 @@ static int __f2fs_init_atgc_curseg(struct > > >>> f2fs_sb_info *sbi) > > >>> } > > >>> int f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi) > > >>> { > > >>> - return __f2fs_init_atgc_curseg(sbi); > > >>> + if (!sbi->am.atgc_enabled) > > >>> + return 0; > > >>> + return f2fs_init_atgc_curseg(sbi); > > >>> } > > >>> > > >>> static void __f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi, int > > >>> type) > > >>> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c > > >>> index 09d3ecf..72676c5 100644 > > >>> --- a/fs/f2fs/sysfs.c > > >>> +++ b/fs/f2fs/sysfs.c > > >>> @@ -673,6 +673,22 @@ static ssize_t __sbi_store(struct f2fs_attr *a, > > >>> return count; > > >>> } > > >>> > > >>> + if (!strcmp(a->attr.name, "atgc_age_threshold")) { > > >>> + if (t < 0) > > >>> + return -EINVAL; > > >>> + sbi->am.age_threshold = t; > > >>> + if (sbi->am.atgc_enabled) > > >>> + return count; > > >>> + > > >>> + if (test_opt(sbi, ATGC) && > > >>> + le64_to_cpu(sbi->ckpt->elapsed_time) >= t) { > > >> > > > Hi Chao, > > >> Oh, I guess you want to fix this: > > > Yes, Sorry for not making it clear before. > > >> > > >> static void init_atgc_management(struct f2fs_sb_info *sbi) > > >> { > > >> ... > > >> if (test_opt(sbi, ATGC) && > > >> SIT_I(sbi)->elapsed_time >= DEF_GC_THREAD_AGE_THRESHOLD) > > >> am->atgc_enabled = true; > > >> > > >> What about enabling atgc_enabled during checkpoint once elapsed time is > > >> satisfed w/ the condition? I guess this can give another chance whenever > > >> CP is been triggered, and it can avoid the racing condition as well. > > > 1. I'm not sure if this will increase checkpoint time consumption? > > > > Since it won't increase any IO time, I guess it's fine tolerate time > > consumed > > by initialization of atgc curseg. > > > > > 2. dynamically enabling atgc may have other problems. Is this confirmed? > > > > I think so, checkpoint has avoided most race cases. > > > > So, how do you think of below diff: > Hi Chao, > I think flow is ok, some details need to be discussed. > > > > --- > > fs/f2fs/checkpoint.c | 2 ++ > > fs/f2fs/f2fs.h | 1 + > > fs/f2fs/segment.c | 26 +++++++++++++++++++++++--- > > 3 files changed, 26 insertions(+), 3 deletions(-) > > > > diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c > > index 55d444bec5c0..4a73bd481a25 100644 > > --- a/fs/f2fs/checkpoint.c > > +++ b/fs/f2fs/checkpoint.c > > @@ -1718,6 +1718,8 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, > > struct cp_control *cpc) > > } > > > > f2fs_restore_inmem_curseg(sbi); > > + f2fs_reinit_atgc_curseg(sbi); > > + > > stat_inc_cp_count(sbi); > > stop: > > unblock_operations(sbi); > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > > index 9688df332147..8d385a1c75ad 100644 > > --- a/fs/f2fs/f2fs.h > > +++ b/fs/f2fs/f2fs.h > > @@ -3693,6 +3693,7 @@ void f2fs_release_discard_addrs(struct f2fs_sb_info > > *sbi); > > int f2fs_npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra); > > bool f2fs_segment_has_free_slot(struct f2fs_sb_info *sbi, int segno); > > int f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi); > > +int f2fs_reinit_atgc_curseg(struct f2fs_sb_info *sbi); > > void f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi); > > void f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi); > > int f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type, > > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c > > index bdc2247387e8..6d4273faf061 100644 > > --- a/fs/f2fs/segment.c > > +++ b/fs/f2fs/segment.c > > @@ -2949,12 +2949,12 @@ static int get_atssr_segment(struct f2fs_sb_info > > *sbi, int type, > > return ret; > > } > > > > -static int __f2fs_init_atgc_curseg(struct f2fs_sb_info *sbi) > > +static int __f2fs_init_atgc_curseg(struct f2fs_sb_info *sbi, bool force) > > { > > struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_ALL_DATA_ATGC); > > int ret = 0; > > > > - if (!sbi->am.atgc_enabled) > > + if (!sbi->am.atgc_enabled && !force) > Is this parameter "force" unnecessary? > in mount flow, even atgc enable conditions are all met, it is not > enabled because of force=false. > Or am I missing something? hi Chao, sorry, I read && as || , Please ignore the above comment, but Is it still OK without the "force" parameter? thanks! > > return 0; > > > > f2fs_down_read(&SM_I(sbi)->curseg_lock); > > @@ -2971,9 +2971,29 @@ static int __f2fs_init_atgc_curseg(struct > > f2fs_sb_info *sbi) > > f2fs_up_read(&SM_I(sbi)->curseg_lock); > > return ret; > > } > > + > > int f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi) > > { > > - return __f2fs_init_atgc_curseg(sbi); > > + return __f2fs_init_atgc_curseg(sbi, false); > > +} > > + > > +int f2fs_reinit_atgc_curseg(struct f2fs_sb_info *sbi) > > +{ > > + int ret; > > + > > + if (!test_opt(sbi, ATGC)) > > + return 0; > > + if (sbi->am.atgc_enabled) > > + return 0; > > + if (SIT_I(sbi)->elapsed_time < sbi->am.age_threshold) > SIT(sbi)->elapsed_time is just updated in mount flow, so > ckpt->elapsed_time is more suitable here? > thanks! > > + return 0; > > + > > + ret = __f2fs_init_atgc_curseg(sbi, true); > > + if (!ret) { > > + sbi->am.atgc_enabled = true; > > + f2fs_info(sbi, "reenabled age threshold GC"); > > + } > > + return ret; > > } > > > > static void __f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi, int type) > > -- > > 2.40.1 > > > > > thanks! > > >> > > >> Thanks, > > >> > > >>> + if (f2fs_init_atgc_curseg(sbi)) > > >>> + return -EINVAL; > > >>> + sbi->am.atgc_enabled = true; > > >>> + } > > >>> + return count; > > >>> + } > > >>> + > > >>> if (!strcmp(a->attr.name, "gc_segment_mode")) { > > >>> if (t < MAX_GC_MODE) > > >>> sbi->gc_segment_mode = t;
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