linux-kernel - Re: [PATCH v2 2/2] f2fs: atgc: export entries for better tunability via sysfs

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Date:   Tue, 25 May 2021 19:32:02 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>
Subject: Re: [PATCH v2 2/2] f2fs: atgc: export entries for better tunability
 via sysfs

Jaegeuk, could you please queue this in dev-test?

On 2021/5/12 10:07, Chao Yu wrote:
> This patch export below sysfs entries for better ATGC tunability.
> 
> /sys/fs/f2fs/<disk>/atgc_candidate_ratio
> /sys/fs/f2fs/<disk>/atgc_candidate_count
> /sys/fs/f2fs/<disk>/atgc_age_weight
> /sys/fs/f2fs/<disk>/atgc_age_threshold
> 
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
> v2:
> - limit value range of candidate_ratio and candidate_ratio in __sbi_store()
>   Documentation/ABI/testing/sysfs-fs-f2fs | 28 +++++++++++++++++++++++++
>   fs/f2fs/sysfs.c                         | 27 ++++++++++++++++++++++++
>   2 files changed, 55 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index 4849b8e84e42..5088281e312e 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -438,3 +438,31 @@ Description:	Show the count of inode newly enabled for compression since mount.
>   		Note that when the compression is disabled for the files, this count
>   		doesn't decrease. If you write "0" here, you can initialize
>   		compr_new_inode to "0".
> +
> +What:		/sys/fs/f2fs/<disk>/atgc_candidate_ratio
> +Date:		May 2021
> +Contact:	"Chao Yu" <yuchao0@...wei.com>
> +Description:	When ATGC is on, it controls candidate ratio in order to limit total
> +		number of potential victim in all candidates, the value should be in
> +		range of [0, 100], by default it was initialized as 20(%).
> +
> +What:		/sys/fs/f2fs/<disk>/atgc_candidate_count
> +Date:		May 2021
> +Contact:	"Chao Yu" <yuchao0@...wei.com>
> +Description:	When ATGC is on, it controls candidate count in order to limit total
> +		number of potential victim in all candidates, by default it was
> +		initialized as 10 (sections).
> +
> +What:		/sys/fs/f2fs/<disk>/atgc_age_weight
> +Date:		May 2021
> +Contact:	"Chao Yu" <yuchao0@...wei.com>
> +Description:	When ATGC is on, it controls age weight to balance weight proportion
> +		in between aging and valid blocks, the value should be in range of
> +		[0, 100], by default it was initialized as 60(%).
> +
> +What:		/sys/fs/f2fs/<disk>/atgc_age_threshold
> +Date:		May 2021
> +Contact:	"Chao Yu" <yuchao0@...wei.com>
> +Description:	When ATGC is on, it controls age threshold to bypass GCing young
> +		candidates whose age is not beyond the threshold, by default it was
> +		initialized as 604800 seconds (equals to 7 days).
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 39b522ec73e7..dc71bc968c72 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -37,6 +37,7 @@ enum {
>   #endif
>   	RESERVED_BLOCKS,	/* struct f2fs_sb_info */
>   	CPRC_INFO,	/* struct ckpt_req_control */
> +	ATGC_INFO,	/* struct atgc_management */
>   };
>   
>   struct f2fs_attr {
> @@ -75,6 +76,8 @@ static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
>   #endif
>   	else if (struct_type == CPRC_INFO)
>   		return (unsigned char *)&sbi->cprc_info;
> +	else if (struct_type == ATGC_INFO)
> +		return (unsigned char *)&sbi->am;
>   	return NULL;
>   }
>   
> @@ -495,6 +498,20 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
>   	}
>   #endif
>   
> +	if (!strcmp(a->attr.name, "atgc_candidate_ratio")) {
> +		if (t > 100)
> +			return -EINVAL;
> +		sbi->am.candidate_ratio = t;
> +		return count;
> +	}
> +
> +	if (!strcmp(a->attr.name, "atgc_age_weight")) {
> +		if (t > 100)
> +			return -EINVAL;
> +		sbi->am.age_weight = t;
> +		return count;
> +	}
> +
>   	*ui = (unsigned int)t;
>   
>   	return count;
> @@ -710,6 +727,11 @@ 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
> +/* For ATGC */
> +F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_candidate_ratio, candidate_ratio);
> +F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_candidate_count, max_candidate_count);
> +F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_weight, age_weight);
> +F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_threshold, age_threshold);
>   
>   #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
>   static struct attribute *f2fs_attrs[] = {
> @@ -778,6 +800,11 @@ static struct attribute *f2fs_attrs[] = {
>   	ATTR_LIST(compr_saved_block),
>   	ATTR_LIST(compr_new_inode),
>   #endif
> +	/* For ATGC */
> +	ATTR_LIST(atgc_candidate_ratio),
> +	ATTR_LIST(atgc_candidate_count),
> +	ATTR_LIST(atgc_age_weight),
> +	ATTR_LIST(atgc_age_threshold),
>   	NULL,
>   };
>   ATTRIBUTE_GROUPS(f2fs);
>