linux-kernel - Re: [PATCH V4] f2fs: show more discard status by sysfs

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Date: Tue, 19 Dec 2023 12:09:12 +0800
From: Zhiguo Niu <niuzhiguo84@...il.com>
To: Chao Yu <chao@...nel.org>
Cc: Zhiguo Niu <zhiguo.niu@...soc.com>, jaegeuk@...nel.org, 
	linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
	ke.wang@...soc.com
Subject: Re: [PATCH V4] f2fs: show more discard status by sysfs

On Tue, Dec 19, 2023 at 12:00 PM Chao Yu <chao@...nel.org> wrote:
>
> On 2023/12/19 10:21, Zhiguo Niu wrote:
> > The current pending_discard attr just only shows the discard_cmd_cnt
> > information. More discard status can be shown so that we can check
> > them through sysfs when needed.
> >
> > Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com>
> > ---
> > changes of v2: Improve the patch according to Chao's suggestions.
> > changes of v3: Add a blank line for easy reading.
> > changes of v4: Split to three entries
> > ---
> > ---
> >   Documentation/ABI/testing/sysfs-fs-f2fs | 15 +++++++++++++++
> >   fs/f2fs/sysfs.c                         | 33 +++++++++++++++++++++++++++++++++
> >   2 files changed, 48 insertions(+)
> >
> > diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> > index 4f1d4e6..606a298 100644
> > --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> > +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> > @@ -159,6 +159,21 @@ Date:            November 2021
> >   Contact:    "Jaegeuk Kim" <jaegeuk@...nel.org>
> >   Description:        Shows the number of pending discard commands in the queue.
> >
> > +What:           /sys/fs/f2fs/<disk>/issued_discard
>
> Add them to /sys/fs/f2fs/<disk>/stat/?
I just want to keep them consistent with the entry "pending_discard"
if they are split to 3 entries.
they are all discard related infos.
Thanks
>
> Thanks,
>
> > +Date:           December 2023
> > +Contact:        "Zhiguo Niu" <zhiguo.niu@...soc.com>
> > +Description:    Shows the number of issued discard.
> > +
> > +What:           /sys/fs/f2fs/<disk>/queued_discard
> > +Date:           December 2023
> > +Contact:        "Zhiguo Niu" <zhiguo.niu@...soc.com>
> > +Description:    Shows the number of queued discard.
> > +
> > +What:           /sys/fs/f2fs/<disk>/undiscard_blks
> > +Date:           December 2023
> > +Contact:        "Zhiguo Niu" <zhiguo.niu@...soc.com>
> > +Description:    Shows the total number of undiscard blocks.
> > +
> >   What:               /sys/fs/f2fs/<disk>/max_victim_search
> >   Date:               January 2014
> >   Contact:    "Jaegeuk Kim" <jaegeuk.kim@...sung.com>
> > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> > index 7099ffa..666efdd 100644
> > --- a/fs/f2fs/sysfs.c
> > +++ b/fs/f2fs/sysfs.c
> > @@ -143,6 +143,33 @@ static ssize_t pending_discard_show(struct f2fs_attr *a,
> >                               &SM_I(sbi)->dcc_info->discard_cmd_cnt));
> >   }
> >
> > +static ssize_t issued_discard_show(struct f2fs_attr *a,
> > +             struct f2fs_sb_info *sbi, char *buf)
> > +{
> > +     if (!SM_I(sbi)->dcc_info)
> > +             return -EINVAL;
> > +     return sysfs_emit(buf, "%llu\n", (unsigned long long)atomic_read(
> > +                             &SM_I(sbi)->dcc_info->issued_discard));
> > +}
> > +
> > +static ssize_t queued_discard_show(struct f2fs_attr *a,
> > +             struct f2fs_sb_info *sbi, char *buf)
> > +{
> > +     if (!SM_I(sbi)->dcc_info)
> > +             return -EINVAL;
> > +     return sysfs_emit(buf, "%llu\n", (unsigned long long)atomic_read(
> > +                             &SM_I(sbi)->dcc_info->queued_discard));
> > +}
> > +
> > +static ssize_t undiscard_blks_show(struct f2fs_attr *a,
> > +             struct f2fs_sb_info *sbi, char *buf)
> > +{
> > +     if (!SM_I(sbi)->dcc_info)
> > +             return -EINVAL;
> > +     return sysfs_emit(buf, "%u\n",
> > +                             SM_I(sbi)->dcc_info->undiscard_blks);
> > +}
> > +
> >   static ssize_t gc_mode_show(struct f2fs_attr *a,
> >               struct f2fs_sb_info *sbi, char *buf)
> >   {
> > @@ -1025,6 +1052,9 @@ static ssize_t f2fs_sb_feature_show(struct f2fs_attr *a,
> >   F2FS_GENERAL_RO_ATTR(mounted_time_sec);
> >   F2FS_GENERAL_RO_ATTR(main_blkaddr);
> >   F2FS_GENERAL_RO_ATTR(pending_discard);
> > +F2FS_GENERAL_RO_ATTR(issued_discard);
> > +F2FS_GENERAL_RO_ATTR(queued_discard);
> > +F2FS_GENERAL_RO_ATTR(undiscard_blks);
> >   F2FS_GENERAL_RO_ATTR(gc_mode);
> >   #ifdef CONFIG_F2FS_STAT_FS
> >   F2FS_GENERAL_RO_ATTR(moved_blocks_background);
> > @@ -1084,6 +1114,9 @@ static ssize_t f2fs_sb_feature_show(struct f2fs_attr *a,
> >       ATTR_LIST(max_ordered_discard),
> >       ATTR_LIST(discard_io_aware),
> >       ATTR_LIST(pending_discard),
> > +     ATTR_LIST(issued_discard),
> > +     ATTR_LIST(queued_discard),
> > +     ATTR_LIST(undiscard_blks),
> >       ATTR_LIST(gc_mode),
> >       ATTR_LIST(ipu_policy),
> >       ATTR_LIST(min_ipu_util),