Re: [PATCH] f2fs: enable atgc if atgc_age_threshold from user is less than elapsed_time

Chao Yu
2024-05-31T02:04:43Z

On 2024/5/30 17:49, Zhiguo Niu wrote:
> On Mon, May 27, 2024 at 12:07 PM Zhiguo Niu <niuzhiguo84@gmail.com> wrote:
>>
>> On Mon, May 27, 2024 at 11:49 AM Chao Yu <chao@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.
>>>
>>> Zhiguo, I didn't get it, can you please explain more about this issue?
>>>
>>> Thanks,
>> Hi Chao,
>>
>> At present, the point of atgc enale is checked during the mount
>> process. What I mean is that if a device has not been rebooted
>> (re-mounted) for a long time, even if the above two conditions are
>> met(ATGC mount option is set, and the device has been powered on long
>> enough， more than atgc default threshold ), atgc cannot be dynamically
>> enabled.
>>
>> If the user is used to not restarting the phone after turning it on,
>> it will be difficult to use atgc.
>> thanks!
> Hi Chao,
> Do you have any suggestions or comments on this?

Zhiguo,

I remember that atgc can not be enabled at runtime due to some reasons, but
I need some time to recall and check the details...

Thanks,

> thanks！
>
>>>
>>>>
>>>> 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.niu@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) {
>>>> + 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;