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Date: Fri, 4 Feb 2022 08:20:39 +0800
From: Chao Yu <chao@...nel.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: add a way to limit roll forward
recovery time
On 2022/2/4 1:42, Jaegeuk Kim wrote:
> On 02/03, Chao Yu wrote:
>> On 2022/2/3 8:34, Jaegeuk Kim wrote:
>>> This adds a sysfs entry to call checkpoint during fsync() in order to avoid
>>> long elapsed time to run roll-forward recovery when booting the device.
>>> Default value doesn't enforce the limitation which is same as before.
>>>
>>> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
>>> ---
>>> v2 from v1:
>>> - make the default w/o enforcement
>>>
>>> Documentation/ABI/testing/sysfs-fs-f2fs | 6 ++++++
>>> fs/f2fs/checkpoint.c | 1 +
>>> fs/f2fs/f2fs.h | 3 +++
>>> fs/f2fs/node.c | 2 ++
>>> fs/f2fs/node.h | 3 +++
>>> fs/f2fs/recovery.c | 4 ++++
>>> fs/f2fs/sysfs.c | 2 ++
>>> 7 files changed, 21 insertions(+)
>>>
>>> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
>>> index 87d3884c90ea..ce8103f522cb 100644
>>> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
>>> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
>>> @@ -567,3 +567,9 @@ 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.
>>> +
>>> +What: /sys/fs/f2fs/<disk>/max_roll_forward_node_blocks
>>> +Date: January 2022
>>> +Contact: "Jaegeuk Kim" <jaegeuk@...nel.org>
>>> +Description: Controls max # of node block writes to be used for roll forward
>>> + recovery. This can limit the roll forward recovery time.
>>> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
>>> index deeda95688f0..57a2d9164bee 100644
>>> --- a/fs/f2fs/checkpoint.c
>>> +++ b/fs/f2fs/checkpoint.c
>>> @@ -1543,6 +1543,7 @@ static int do_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
>>> /* update user_block_counts */
>>> sbi->last_valid_block_count = sbi->total_valid_block_count;
>>> percpu_counter_set(&sbi->alloc_valid_block_count, 0);
>>> + percpu_counter_set(&sbi->rf_node_block_count, 0);
>>> /* Here, we have one bio having CP pack except cp pack 2 page */
>>> f2fs_sync_meta_pages(sbi, META, LONG_MAX, FS_CP_META_IO);
>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>>> index 63c90416364b..6ddb98ff0b7c 100644
>>> --- a/fs/f2fs/f2fs.h
>>> +++ b/fs/f2fs/f2fs.h
>>> @@ -913,6 +913,7 @@ struct f2fs_nm_info {
>>> nid_t max_nid; /* maximum possible node ids */
>>> nid_t available_nids; /* # of available node ids */
>>> nid_t next_scan_nid; /* the next nid to be scanned */
>>> + nid_t max_rf_node_blocks; /* max # of nodes for recovery */
>>> unsigned int ram_thresh; /* control the memory footprint */
>>> unsigned int ra_nid_pages; /* # of nid pages to be readaheaded */
>>> unsigned int dirty_nats_ratio; /* control dirty nats ratio threshold */
>>> @@ -1684,6 +1685,8 @@ struct f2fs_sb_info {
>>> atomic_t nr_pages[NR_COUNT_TYPE];
>>> /* # of allocated blocks */
>>> struct percpu_counter alloc_valid_block_count;
>>> + /* # of node block writes as roll forward recovery */
>>> + struct percpu_counter rf_node_block_count;
>>> /* writeback control */
>>> atomic_t wb_sync_req[META]; /* count # of WB_SYNC threads */
>>> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
>>> index 93512f8859d5..0d9883457579 100644
>>> --- a/fs/f2fs/node.c
>>> +++ b/fs/f2fs/node.c
>>> @@ -1782,6 +1782,7 @@ int f2fs_fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
>>> if (!atomic || page == last_page) {
>>> set_fsync_mark(page, 1);
>>> + percpu_counter_inc(&sbi->rf_node_block_count);
>>
>> if (NM_I(sbi)->max_rf_node_blocks)
>> percpu_counter_inc(&sbi->rf_node_block_count);
>
> I think we can just count this and adjust right away once sysfs is changed.
Since this long recovery latency issue is a corner case, I guess we can avoid this
to save cpu time...
BTW, shouldn't we account all warn dnode blocks? as we will traverse all blocks there
in warn node list.
Thanks,
>
>>
>> Thanks,
>>
>>> if (IS_INODE(page)) {
>>> if (is_inode_flag_set(inode,
>>> FI_DIRTY_INODE))
>>> @@ -3218,6 +3219,7 @@ static int init_node_manager(struct f2fs_sb_info *sbi)
>>> nm_i->ram_thresh = DEF_RAM_THRESHOLD;
>>> nm_i->ra_nid_pages = DEF_RA_NID_PAGES;
>>> nm_i->dirty_nats_ratio = DEF_DIRTY_NAT_RATIO_THRESHOLD;
>>> + nm_i->max_rf_node_blocks = DEF_RF_NODE_BLOCKS;
>>> INIT_RADIX_TREE(&nm_i->free_nid_root, GFP_ATOMIC);
>>> INIT_LIST_HEAD(&nm_i->free_nid_list);
>>> diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
>>> index 18b98cf0465b..4c1d34bfea78 100644
>>> --- a/fs/f2fs/node.h
>>> +++ b/fs/f2fs/node.h
>>> @@ -31,6 +31,9 @@
>>> /* control total # of nats */
>>> #define DEF_NAT_CACHE_THRESHOLD 100000
>>> +/* control total # of node writes used for roll-fowrad recovery */
>>> +#define DEF_RF_NODE_BLOCKS 0
>>> +
>>> /* vector size for gang look-up from nat cache that consists of radix tree */
>>> #define NATVEC_SIZE 64
>>> #define SETVEC_SIZE 32
>>> diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
>>> index 10d152cfa58d..1c8041fd854e 100644
>>> --- a/fs/f2fs/recovery.c
>>> +++ b/fs/f2fs/recovery.c
>>> @@ -53,9 +53,13 @@ extern struct kmem_cache *f2fs_cf_name_slab;
>>> bool f2fs_space_for_roll_forward(struct f2fs_sb_info *sbi)
>>> {
>>> s64 nalloc = percpu_counter_sum_positive(&sbi->alloc_valid_block_count);
>>> + u32 rf_node = percpu_counter_sum_positive(&sbi->rf_node_block_count);
>>> if (sbi->last_valid_block_count + nalloc > sbi->user_block_count)
>>> return false;
>>> + if (NM_I(sbi)->max_rf_node_blocks &&
>>> + rf_node >= NM_I(sbi)->max_rf_node_blocks)
>>> + return false;
>>> return true;
>>> }
>>> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
>>> index 281bc0133ee6..47efcf233afd 100644
>>> --- a/fs/f2fs/sysfs.c
>>> +++ b/fs/f2fs/sysfs.c
>>> @@ -732,6 +732,7 @@ F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ssr_sections, min_ssr_sections);
>>> F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
>>> F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
>>> F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
>>> +F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, max_roll_forward_node_blocks, max_rf_node_blocks);
>>> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
>>> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, migration_granularity, migration_granularity);
>>> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
>>> @@ -855,6 +856,7 @@ static struct attribute *f2fs_attrs[] = {
>>> ATTR_LIST(ram_thresh),
>>> ATTR_LIST(ra_nid_pages),
>>> ATTR_LIST(dirty_nats_ratio),
>>> + ATTR_LIST(max_roll_forward_node_blocks),
>>> ATTR_LIST(cp_interval),
>>> ATTR_LIST(idle_interval),
>>> ATTR_LIST(discard_idle_interval),
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