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Date: Fri, 28 Oct 2022 11:46:30 +0800
From: Chao Yu <chao@...nel.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: Yangtao Li <frank.li@...o.com>,
linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] f2fs: introducr gc_urgent_idle_remaining sysfs
node and mark gc_urgent_high_remaining node deprecated
On 2022/10/28 11:22, Jaegeuk Kim wrote:
> On 10/28, Chao Yu wrote:
>> On 2022/10/25 14:50, Yangtao Li wrote:
>>> Added a new sysfs node called gc_urgent_idle_remaining.
>>> The user can set the trial count limit for GC urgent and
>>> idle mode with this value. If GC thread gets to the limit,
>>> the mode will turn back to GC normal mode finally.
>>>
>>> This method is not only applicable to gc_urgent_high,
>>> but applicable to all gc modes. Also mark
>>> gc_urgent_high_remaining as deprecated, so that the node
>>> can be removed in the future.
>>>
>>> Signed-off-by: Yangtao Li <frank.li@...o.com>
>>> ---
>>> Documentation/ABI/testing/sysfs-fs-f2fs | 8 ++++++++
>>> fs/f2fs/f2fs.h | 6 ++++--
>>> fs/f2fs/gc.c | 12 ++++++------
>>> fs/f2fs/super.c | 2 +-
>>> fs/f2fs/sysfs.c | 14 ++++++++++----
>>> 5 files changed, 29 insertions(+), 13 deletions(-)
>>>
>>> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
>>> index 483639fb727b..859c4e53a846 100644
>>> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
>>> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
>>> @@ -598,6 +598,14 @@ Contact: "Daeho Jeong" <daehojeong@...gle.com>
>>> Description: You can set the trial count limit for GC urgent high mode with this value.
>>> If GC thread gets to the limit, the mode will turn back to GC normal mode.
>>> By default, the value is zero, which means there is no limit like before.
>>> + <deprecated>
>>> +
>>> +What: /sys/fs/f2fs/<disk>/gc_urgent_idle_remaining
>>> +Date: October 2022
>>> +Contact: "Yangtao Li" <frank.li@...o.com>
>>> +Description: You can set the trial count limit for GC urgent and idle mode with this value.
>>> + If GC thread gets to the limit, the mode will turn back to GC normal mode.
>>> + By default, the value is zero, which means there is no limit like before.
>>> What: /sys/fs/f2fs/<disk>/max_roll_forward_node_blocks
>>> Date: January 2022
>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>>> index e6355a5683b7..2bad69cf9fd9 100644
>>> --- a/fs/f2fs/f2fs.h
>>> +++ b/fs/f2fs/f2fs.h
>>> @@ -1734,8 +1734,10 @@ struct f2fs_sb_info {
>>> unsigned int cur_victim_sec; /* current victim section num */
>>> unsigned int gc_mode; /* current GC state */
>>> unsigned int next_victim_seg[2]; /* next segment in victim section */
>>> - spinlock_t gc_urgent_high_lock;
>>> - unsigned int gc_urgent_high_remaining; /* remaining trial count for GC_URGENT_HIGH */
>>> + spinlock_t gc_urgent_idle_lock;
>>> + /* remaining trial count for GC_URGENT_* and GC_IDLE_* */
>>> + unsigned int gc_urgent_idle_remaining;
>>> + unsigned int gc_urgent_high_remaining; /* deprecated */
>>> /* for skip statistic */
>>> unsigned long long skipped_gc_rwsem; /* FG_GC only */
>>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
>>> index e0ff99c7e3f2..0ed5b3c5922c 100644
>>> --- a/fs/f2fs/gc.c
>>> +++ b/fs/f2fs/gc.c
>>> @@ -152,14 +152,14 @@ static int gc_thread_func(void *data)
>>> /* balancing f2fs's metadata periodically */
>>> f2fs_balance_fs_bg(sbi, true);
>>> next:
>>> - if (sbi->gc_mode == GC_URGENT_HIGH) {
>>> - spin_lock(&sbi->gc_urgent_high_lock);
>>> - if (sbi->gc_urgent_high_remaining) {
>>> - sbi->gc_urgent_high_remaining--;
>>> - if (!sbi->gc_urgent_high_remaining)
>>> + if (sbi->gc_mode != GC_NORMAL) {
>>> + spin_lock(&sbi->gc_urgent_idle_lock);
>>> + if (sbi->gc_urgent_idle_remaining) {
>>> + sbi->gc_urgent_idle_remaining--;
>>> + if (!sbi->gc_urgent_idle_remaining)
>>> sbi->gc_mode = GC_NORMAL;
>>> }
>>> - spin_unlock(&sbi->gc_urgent_high_lock);
>>> + spin_unlock(&sbi->gc_urgent_idle_lock);
>>> }
>>> sb_end_write(sbi->sb);
>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>>> index 3834ead04620..f90a8c0a53ec 100644
>>> --- a/fs/f2fs/super.c
>>> +++ b/fs/f2fs/super.c
>>> @@ -3616,7 +3616,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
>>> sbi->seq_file_ra_mul = MIN_RA_MUL;
>>> sbi->max_fragment_chunk = DEF_FRAGMENT_SIZE;
>>> sbi->max_fragment_hole = DEF_FRAGMENT_SIZE;
>>> - spin_lock_init(&sbi->gc_urgent_high_lock);
>>> + spin_lock_init(&sbi->gc_urgent_idle_lock);
>>> atomic64_set(&sbi->current_atomic_write, 0);
>>> sbi->dir_level = DEF_DIR_LEVEL;
>>> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
>>> index df27afd71ef4..2b1c653b37cf 100644
>>> --- a/fs/f2fs/sysfs.c
>>> +++ b/fs/f2fs/sysfs.c
>>> @@ -531,10 +531,14 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
>>> return count;
>>> }
>>> - if (!strcmp(a->attr.name, "gc_urgent_high_remaining")) {
>>> - spin_lock(&sbi->gc_urgent_high_lock);
>>> - sbi->gc_urgent_high_remaining = t;
>>> - spin_unlock(&sbi->gc_urgent_high_lock);
>>> + /* deprecated */
>>> + if (!strcmp(a->attr.name, "gc_urgent_high_remaining"))
>>> + return -EINVAL;
>>
>> How about those users who has already used these interface... it breaks
>> the usage.
>>
>> It needs to keep old interface and tag as deprecated, and recommend user
>> to use new interface you introduced.
>
> I feel that this is not a super critical node, so how about just removing it?
Only Android is using this inferface, right?
Any plan to adjust related code from Android side?
Thanks,
>
>>
>> e.g.:
>>
>> What: /sys/fs/f2fs/<disk>/features
>> Date: July 2017
>> Contact: "Jaegeuk Kim" <jaegeuk@...nel.org>
>> Description: <deprecated: should use /sys/fs/f2fs/<disk>/feature_list/
>> Shows all enabled features in current device.
>> Supported features:
>> encryption, blkzoned, extra_attr, projquota, inode_checksum,
>> flexible_inline_xattr, quota_ino, inode_crtime, lost_found,
>> verity, sb_checksum, casefold, readonly, compression, pin_file.
>>
>> Thanks,
>>
>>> +
>>> + if (!strcmp(a->attr.name, "gc_urgent_idle_remaining")) {
>>> + spin_lock(&sbi->gc_urgent_idle_lock);
>>> + sbi->gc_urgent_idle_remaining = t;
>>> + spin_unlock(&sbi->gc_urgent_idle_lock);
>>> return count;
>>> }
>>> @@ -826,6 +830,7 @@ F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
>>> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, data_io_flag, data_io_flag);
>>> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, node_io_flag, node_io_flag);
>>> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_urgent_high_remaining, gc_urgent_high_remaining);
>>> +F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_urgent_idle_remaining, gc_urgent_idle_remaining);
>>> F2FS_RW_ATTR(CPRC_INFO, ckpt_req_control, ckpt_thread_ioprio, ckpt_thread_ioprio);
>>> F2FS_GENERAL_RO_ATTR(dirty_segments);
>>> F2FS_GENERAL_RO_ATTR(free_segments);
>>> @@ -953,6 +958,7 @@ static struct attribute *f2fs_attrs[] = {
>>> ATTR_LIST(data_io_flag),
>>> ATTR_LIST(node_io_flag),
>>> ATTR_LIST(gc_urgent_high_remaining),
>>> + ATTR_LIST(gc_urgent_idle_remaining),
>>> ATTR_LIST(ckpt_thread_ioprio),
>>> ATTR_LIST(dirty_segments),
>>> ATTR_LIST(free_segments),
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