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SubjectRe: [PATCH 3/3] f2fs: export migration_granularity sysfs entry
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On 2018/10/25 11:01, Yunlong Song wrote:
>
>
> On 2018/10/24 18:37, Chao Yu wrote:
>> Add one sysfs entry to control migration granularity of GC in large
>> section f2fs, it can be tuned to mitigate heavy overhead of migrating
>> huge number of blocks in large section.
>>
>> Signed-off-by: Chao Yu <yuchao0@huawei.com>
>> ---
>> Documentation/ABI/testing/sysfs-fs-f2fs | 9 +++++++++
>> fs/f2fs/sysfs.c | 7 +++++++
>> 2 files changed, 16 insertions(+)
>>
>> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
>> index 3ac41774ad3c..a7ce33199457 100644
>> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
>> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
>> @@ -92,6 +92,15 @@ Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
>> Description:
>> Controls the number of trials to find a victim segment.
>>
>> +What: /sys/fs/f2fs/<disk>/migration_granularity
>> +Date: October 2018
>> +Contact: "Chao Yu" <yuchao0@huawei.com>
>> +Description:
>> + Controls migration granularity of garbage collection on large
>> + section, it can let GC move partial segment{s} of one section
>> + in one GC cycle, so that dispersing heavy overhead GC to
>> + multiple lightweight one.
>> +
>> What: /sys/fs/f2fs/<disk>/dir_level
>> Date: March 2014
>> Contact: "Jaegeuk Kim" <jaegeuk.kim@samsung.com>
>> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
>> index 240e4881279e..b393fda6d6dc 100644
>> --- a/fs/f2fs/sysfs.c
>> +++ b/fs/f2fs/sysfs.c
>> @@ -246,6 +246,11 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
>> return count;
>> }
>>
>> + if (!strcmp(a->attr.name, "discard_granularity")) {
>
> Should be migration_granularity ?

Oh, let me fix this in v2.

Thanks,

>
>> + if (t == 0 || t > sbi->segs_per_sec)
>> + return -EINVAL;
>> + }
>> +
>> if (!strcmp(a->attr.name, "trim_sections"))
>> return -EINVAL;
>>
>> @@ -406,6 +411,7 @@ 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(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);
>> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
>> F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
>> @@ -460,6 +466,7 @@ static struct attribute *f2fs_attrs[] = {
>> ATTR_LIST(min_hot_blocks),
>> ATTR_LIST(min_ssr_sections),
>> ATTR_LIST(max_victim_search),
>> + ATTR_LIST(migration_granularity),
>> ATTR_LIST(dir_level),
>> ATTR_LIST(ram_thresh),
>> ATTR_LIST(ra_nid_pages),
>

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