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

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Date: Wed, 20 Dec 2023 08:06:46 +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 11:24 PM Chao Yu <chao@...nel.org> wrote:
>
> On 2023/12/19 12:09, Zhiguo Niu wrote:
> > 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"
>
> There are too many entries in root directory of f2fs sysfs entry, so I
> created the 'stat' sub-directory for later all read-only stat-related
> entry. I think it's fine to create new discard stat entries there.
I got it  and will update the patch. thanks.
>
> Thanks,
>
> > 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),