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Date: Fri, 12 Mar 2021 17:50:49 +0800
From: Chao Yu <yuchao0@...wei.com>
To: Daeho Jeong <daeho43@...il.com>, <linux-kernel@...r.kernel.org>,
<linux-f2fs-devel@...ts.sourceforge.net>, <kernel-team@...roid.com>
CC: Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH v3] f2fs: add sysfs nodes to get runtime
compression stat
On 2021/3/11 10:32, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@...gle.com>
>
> I've added new sysfs nodes to show runtime compression stat since mount.
> compr_written_block - show the block count written after compression
> compr_saved_block - show the saved block count with compression
> compr_new_inode - show the count of inode newly enabled for compression
>
> Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> ---
> v2: thanks to kernel test robot <lkp@...el.com>, fixed compile issue
> related to kernel config.
> v3: changed sysfs nodes' names and made them runtime stat, not
> persistent on disk
> ---
> Documentation/ABI/testing/sysfs-fs-f2fs | 20 +++++++++
> fs/f2fs/compress.c | 1 +
> fs/f2fs/f2fs.h | 19 ++++++++
> fs/f2fs/super.c | 7 +++
> fs/f2fs/sysfs.c | 58 +++++++++++++++++++++++++
> 5 files changed, 105 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index cbeac1bebe2f..f2981eb319cb 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -409,3 +409,23 @@ Description: Give a way to change checkpoint merge daemon's io priority.
> I/O priority "3". We can select the class between "rt" and "be",
> and set the I/O priority within valid range of it. "," delimiter
> is necessary in between I/O class and priority number.
> +
> +What: /sys/fs/f2fs/<disk>/compr_written_block
> +Date: March 2021
> +Contact: "Daeho Jeong" <daehojeong@...gle.com>
> +Description: Show the block count written after compression since mount.
> + If you write "0" here, you can initialize compr_written_block and
> + compr_saved_block to "0".
> +
> +What: /sys/fs/f2fs/<disk>/compr_saved_block
> +Date: March 2021
> +Contact: "Daeho Jeong" <daehojeong@...gle.com>
> +Description: Show the saved block count with compression since mount.
> + If you write "0" here, you can initialize compr_written_block and
> + compr_saved_block to "0".
> +
> +What: /sys/fs/f2fs/<disk>/compr_new_inode
> +Date: March 2021
> +Contact: "Daeho Jeong" <daehojeong@...gle.com>
> +Description: Show the count of inode newly enabled for compression since mount.
> + If you write "0" here, you can initialize compr_new_inode to "0".
> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> index 77fa342de38f..3c9d797dbdd6 100644
> --- a/fs/f2fs/compress.c
> +++ b/fs/f2fs/compress.c
> @@ -1353,6 +1353,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
> if (fio.compr_blocks)
> f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
> f2fs_i_compr_blocks_update(inode, cc->nr_cpages, true);
> + add_compr_block_stat(inode, cc->nr_cpages);
If compressed cluster was overwritten as normal cluster, compr_saved_block value
won't be decreased, is it fine?
>
> set_inode_flag(cc->inode, FI_APPEND_WRITE);
> if (cc->cluster_idx == 0)
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index e2d302ae3a46..2c989f8caf05 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1623,6 +1623,11 @@ struct f2fs_sb_info {
> #ifdef CONFIG_F2FS_FS_COMPRESSION
> struct kmem_cache *page_array_slab; /* page array entry */
> unsigned int page_array_slab_size; /* default page array slab size */
> +
> + /* For runtime compression statistics */
> + atomic64_t compr_written_block;
> + atomic64_t compr_saved_block;
> + atomic_t compr_new_inode;
> #endif
> };
>
> @@ -3955,6 +3960,18 @@ int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi);
> void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi);
> int __init f2fs_init_compress_cache(void);
> void f2fs_destroy_compress_cache(void);
> +#define inc_compr_inode_stat(inode) \
> + do { \
> + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); \
> + atomic_inc(&sbi->compr_new_inode); \
> + } while (0)
> +#define add_compr_block_stat(inode, blocks) \
> + do { \
> + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); \
> + int diff = F2FS_I(inode)->i_cluster_size - blocks; \
> + atomic64_add(blocks, &sbi->compr_written_block); \
> + atomic64_add(diff, &sbi->compr_saved_block); \
> + } while (0)
> #else
> static inline bool f2fs_is_compressed_page(struct page *page) { return false; }
> static inline bool f2fs_is_compress_backend_ready(struct inode *inode)
> @@ -3983,6 +4000,7 @@ static inline int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi) { return
> static inline void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi) { }
> static inline int __init f2fs_init_compress_cache(void) { return 0; }
> static inline void f2fs_destroy_compress_cache(void) { }
> +#define inc_compr_inode_stat(inode) do { } while (0)
> #endif
>
> static inline void set_compress_context(struct inode *inode)
> @@ -4006,6 +4024,7 @@ static inline void set_compress_context(struct inode *inode)
> F2FS_I(inode)->i_flags |= F2FS_COMPR_FL;
> set_inode_flag(inode, FI_COMPRESSED_FILE);
> stat_inc_compr_inode(inode);
> + inc_compr_inode_stat(inode);
Ditto, if we disable compressed file via f2fs_disable_compressed_file(),
compr_new_inode value won't be decreased correctly.
If there is no problem, it needs to add description to indicate it won't be
aware of decrease of saved/written blocks or compressed inode number.
Thanks,
> f2fs_mark_inode_dirty_sync(inode, true);
> }
>
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 7069793752f1..88d9ecdee8d3 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -3260,6 +3260,13 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
>
> init_rwsem(&sbi->sb_lock);
> init_rwsem(&sbi->pin_sem);
> +
> +#ifdef CONFIG_F2FS_FS_COMPRESSION
> + /* For runtime compression statistics */
> + atomic64_set(&sbi->compr_written_block, 0);
> + atomic64_set(&sbi->compr_saved_block, 0);
> + atomic_set(&sbi->compr_new_inode, 0);
> +#endif
> }
>
> static int init_percpu_info(struct f2fs_sb_info *sbi)
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index e38a7f6921dd..2b6e5e6e1286 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -282,6 +282,38 @@ static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
> return len;
> }
>
> +#ifdef CONFIG_F2FS_FS_COMPRESSION
> + if (!strcmp(a->attr.name, "compr_written_block")) {
> + u64 bcount;
> + int len;
> +
> + bcount = atomic64_read(&sbi->compr_written_block);
> +
> + len = scnprintf(buf, PAGE_SIZE, "%llu\n", bcount);
> + return len;
> + }
> +
> + if (!strcmp(a->attr.name, "compr_saved_block")) {
> + u64 bcount;
> + int len;
> +
> + bcount = atomic64_read(&sbi->compr_saved_block);
> +
> + len = scnprintf(buf, PAGE_SIZE, "%llu\n", bcount);
> + return len;
> + }
> +
> + if (!strcmp(a->attr.name, "compr_new_inode")) {
> + u32 icount;
> + int len;
> +
> + icount = atomic_read(&sbi->compr_new_inode);
> +
> + len = scnprintf(buf, PAGE_SIZE, "%u\n", icount);
> + return len;
> + }
> +#endif
> +
> ui = (unsigned int *)(ptr + a->offset);
>
> return sprintf(buf, "%u\n", *ui);
> @@ -458,6 +490,24 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
> return count;
> }
>
> +#ifdef CONFIG_F2FS_FS_COMPRESSION
> + if (!strcmp(a->attr.name, "compr_written_block") ||
> + !strcmp(a->attr.name, "compr_saved_block")) {
> + if (t != 0)
> + return -EINVAL;
> + atomic64_set(&sbi->compr_written_block, 0);
> + atomic64_set(&sbi->compr_saved_block, 0);
> + return count;
> + }
> +
> + if (!strcmp(a->attr.name, "compr_new_inode")) {
> + if (t != 0)
> + return -EINVAL;
> + atomic_set(&sbi->compr_new_inode, 0);
> + return count;
> + }
> +#endif
> +
> *ui = (unsigned int)t;
>
> return count;
> @@ -668,6 +718,9 @@ F2FS_FEATURE_RO_ATTR(sb_checksum, FEAT_SB_CHECKSUM);
> F2FS_FEATURE_RO_ATTR(casefold, FEAT_CASEFOLD);
> #ifdef CONFIG_F2FS_FS_COMPRESSION
> F2FS_FEATURE_RO_ATTR(compression, FEAT_COMPRESSION);
> +F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_written_block, compr_written_block);
> +F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_saved_block, compr_saved_block);
> +F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, compr_new_inode, compr_new_inode);
> #endif
>
> #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
> @@ -730,6 +783,11 @@ static struct attribute *f2fs_attrs[] = {
> ATTR_LIST(moved_blocks_foreground),
> ATTR_LIST(moved_blocks_background),
> ATTR_LIST(avg_vblocks),
> +#endif
> +#ifdef CONFIG_F2FS_FS_COMPRESSION
> + ATTR_LIST(compr_written_block),
> + ATTR_LIST(compr_saved_block),
> + ATTR_LIST(compr_new_inode),
> #endif
> NULL,
> };
>
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