Received-SPF: pass (google.com: domain of linux-kernel+bounces-196181-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
Precedence: bulk
MIME-Version: 1.0
References: <1716204978-29455-1-git-send-email-zhiguo.niu@unisoc.com>
 <1d67715b-5f88-4940-969d-e098fd80ae2a@kernel.org> <CAHJ8P3LXYWQ+bLZHPn_5FLu3oi83ei8C9ZCzAXwa9oBdEKVDNA@mail.gmail.com>
 <CAHJ8P3+ro9YsU7jZWeAfiUh9uNFEj_=Wiaf2YRLVLBD5_9fM0g@mail.gmail.com> <0a4b5b40-1532-44a4-a4d6-601ceced20a4@kernel.org>
In-Reply-To: <0a4b5b40-1532-44a4-a4d6-601ceced20a4@kernel.org>
From: Zhiguo Niu <niuzhiguo84@gmail.com>
Date: Fri, 31 May 2024 10:15:36 +0800
Message-ID: <CAHJ8P3J1_Yg3FAruR0zPQdDnbw_GbT7wOKON3-xzBr32+HU_6w@mail.gmail.com>
Subject: Re: [PATCH] f2fs: enable atgc if atgc_age_threshold from user is less
 than elapsed_time
To: Chao Yu <chao@kernel.org>
Cc: Zhiguo Niu <zhiguo.niu@unisoc.com>, jaegeuk@kernel.org, 
	linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, 
	ke.wang@unisoc.com
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

On Fri, May 31, 2024 at 10:04=E2=80=AFAM Chao Yu <chao@kernel.org> wrote:
>
> On 2024/5/30 17:49, Zhiguo Niu wrote:
> > On Mon, May 27, 2024 at 12:07=E2=80=AFPM Zhiguo Niu <niuzhiguo84@gmail.=
com> wrote:
> >>
> >> On Mon, May 27, 2024 at 11:49=E2=80=AFAM Chao Yu <chao@kernel.org> wro=
te:
> >>>
> >>> 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=EF=BC=8C more than atgc default threshold ), atgc cannot be dyn=
amically
> >> 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, b=
ut
> I need some time to recall and check the details...
>
> Thanks,
Hi Chao,
OK, Thanks for your help.
>
> > thanks=EF=BC=81
> >
> >>>
> >>>>
> >>>> It is better to enable atgc dynamiclly when user change atgc_age_thr=
eshold
> >>>> 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_s=
b_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, in=
t 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 =3D CURSEG_I(sbi, CURSEG_ALL_DATA_=
ATGC);
> >>>>        int ret =3D 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, in=
t 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 =3D t;
> >>>> +             if (sbi->am.atgc_enabled)
> >>>> +                     return count;
> >>>> +
> >>>> +             if (test_opt(sbi, ATGC) &&
> >>>> +                     le64_to_cpu(sbi->ckpt->elapsed_time) >=3D t) {
> >>>> +                     if (f2fs_init_atgc_curseg(sbi))
> >>>> +                             return -EINVAL;
> >>>> +                     sbi->am.atgc_enabled =3D true;
> >>>> +             }
> >>>> +             return count;
> >>>> +     }
> >>>> +
> >>>>        if (!strcmp(a->attr.name, "gc_segment_mode")) {
> >>>>                if (t < MAX_GC_MODE)
> >>>>                        sbi->gc_segment_mode =3D t;