linux-kernel - Re: [PATCH 2/2 v3] f2fs: add sysfs nodes to set last_age

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Date:   Fri, 3 Feb 2023 16:31:58 +0800
From:   Chao Yu <chao@...nel.org>
To:     qixiaoyu1 <qxy65535@...il.com>, Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        Ping Xiong <xiongping1@...omi.com>,
        Xiaoyu Qi <qixiaoyu1@...omi.com>
Subject: Re: [PATCH 2/2 v3] f2fs: add sysfs nodes to set last_age_weight

On 2023/2/2 16:20, qixiaoyu1 wrote:
> Signed-off-by: qixiaoyu1 <qixiaoyu1@...omi.com>
> Signed-off-by: xiongping1 <xiongping1@...omi.com>
> ---
>   Documentation/ABI/testing/sysfs-fs-f2fs |  5 +++++
>   fs/f2fs/extent_cache.c                  | 15 +++++++++------
>   fs/f2fs/f2fs.h                          |  1 +
>   fs/f2fs/sysfs.c                         | 11 +++++++++++
>   4 files changed, 26 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index 9e3756625a81..11af7dbb6bc9 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -669,3 +669,8 @@ Contact:	"Ping Xiong" <xiongping1@...omi.com>
>   Description:	When DATA SEPARATION is on, it controls the age threshold to indicate
>   		the data blocks as warm. By default it was initialized as 2621440 blocks
>   		(equals to 10GB).
> +
> +What:           /sys/fs/f2fs/<disk>/last_age_weight
> +Date:           January 2023
> +Contact:        "Ping Xiong" <xiongping1@...omi.com>
> +Description:    When DATA SEPARATION is on, it controls the weight of last data block age.
> diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
> index d9f12f404beb..ce99882ba81c 100644
> --- a/fs/f2fs/extent_cache.c
> +++ b/fs/f2fs/extent_cache.c
> @@ -871,19 +871,21 @@ void f2fs_update_read_extent_tree_range_compressed(struct inode *inode,
>   }
>   #endif
>   
> -static unsigned long long __calculate_block_age(unsigned long long new,
> +static unsigned long long __calculate_block_age(struct f2fs_sb_info *sbi,
> +						unsigned long long new,
>   						unsigned long long old)
>   {
>   	unsigned int rem_old, rem_new;
>   	unsigned long long res;
> +	unsigned int weight = sbi->last_age_weight;
>   
> -	res = div_u64_rem(new, 100, &rem_new) * (100 - LAST_AGE_WEIGHT)
> -		+ div_u64_rem(old, 100, &rem_old) * LAST_AGE_WEIGHT;
> +	res = div_u64_rem(new, 100, &rem_new) * (100 - weight)
> +		+ div_u64_rem(old, 100, &rem_old) * weight;
>   
>   	if (rem_new)
> -		res += rem_new * (100 - LAST_AGE_WEIGHT) / 100;
> +		res += rem_new * (100 - weight) / 100;
>   	if (rem_old)
> -		res += rem_old * LAST_AGE_WEIGHT / 100;
> +		res += rem_old * weight / 100;
>   
>   	return res;
>   }
> @@ -917,7 +919,7 @@ static int __get_new_block_age(struct inode *inode, struct extent_info *ei,
>   			cur_age = ULLONG_MAX - tei.last_blocks + cur_blocks;
>   
>   		if (tei.age)
> -			ei->age = __calculate_block_age(cur_age, tei.age);
> +			ei->age = __calculate_block_age(sbi, cur_age, tei.age);
>   		else
>   			ei->age = cur_age;
>   		ei->last_blocks = cur_blocks;
> @@ -1233,6 +1235,7 @@ void f2fs_init_extent_cache_info(struct f2fs_sb_info *sbi)
>   	atomic64_set(&sbi->allocated_data_blocks, 0);
>   	sbi->hot_data_age_threshold = DEF_HOT_DATA_AGE_THRESHOLD;
>   	sbi->warm_data_age_threshold = DEF_WARM_DATA_AGE_THRESHOLD;
> +	sbi->last_age_weight = LAST_AGE_WEIGHT;
>   }
>   
>   int __init f2fs_create_extent_cache(void)
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index e8953c3dc81a..c3609cbc28c7 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1679,6 +1679,7 @@ struct f2fs_sb_info {
>   	/* The threshold used for hot and warm data seperation*/
>   	unsigned int hot_data_age_threshold;
>   	unsigned int warm_data_age_threshold;
> +	unsigned int last_age_weight;
>   
>   	/* basic filesystem units */
>   	unsigned int log_sectors_per_block;	/* log2 sectors per block */
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 83a366f3ee80..a70cf674d8e7 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -686,6 +686,15 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
>   		return count;
>   	}
>   
> +	if (!strcmp(a->attr.name, "last_age_weight")) {
> +		if (t <= 0 || t >= 100)

Could 0 or 100 be a valid value?

Thanks,

> +			return -EINVAL;
> +		if (t == *ui)
> +			return count;
> +		*ui = (unsigned int)t;
> +		return count;
> +	}
> +
>   	*ui = (unsigned int)t;
>   
>   	return count;
> @@ -944,6 +953,7 @@ F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, revoked_atomic_block, revoked_atomic_block)
>   /* For block age extent cache */
>   F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, hot_data_age_threshold, hot_data_age_threshold);
>   F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, warm_data_age_threshold, warm_data_age_threshold);
> +F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, last_age_weight, last_age_weight);
>   
>   #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
>   static struct attribute *f2fs_attrs[] = {
> @@ -1042,6 +1052,7 @@ static struct attribute *f2fs_attrs[] = {
>   	ATTR_LIST(revoked_atomic_block),
>   	ATTR_LIST(hot_data_age_threshold),
>   	ATTR_LIST(warm_data_age_threshold),
> +	ATTR_LIST(last_age_weight),
>   	NULL,
>   };
>   ATTRIBUTE_GROUPS(f2fs);