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SubjectRe: [f2fs-dev] [PATCH] f2fs: add sysfs nodes to get GC info for each GC urgent mode
On 07/02, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@google.com>
>
> Added gc_urgent_dirty_segs and gc_urgent_dirty_segs_mode sysfs nodes.
> 1) "gc_urgent_dirty_segs" shows how many dirty segments have been
> reclaimed by GC during a specific GC urgent mode.
> 2) "gc_urgent_dirty_segs_mode" is used to control for which gc urgent
> mode the "gc_urgent_dirty_segs" node shows.
> (1: GC urgent high, 2: GC urgent low)
>
> Signed-off-by: Daeho Jeong <daehojeong@google.com>
> ---
> Documentation/ABI/testing/sysfs-fs-f2fs | 14 ++++++++
> fs/f2fs/f2fs.h | 5 +++
> fs/f2fs/gc.c | 4 +++
> fs/f2fs/sysfs.c | 46 +++++++++++++++++++++++++
> 4 files changed, 69 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index 95155e4ec7fe..9851c3f2efad 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -493,3 +493,17 @@ Contact: "Chao Yu" <yuchao0@huawei.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).
> +
> +What: /sys/fs/f2fs/<disk>/gc_urgent_dirty_segs
> +Date: July 2021
> +Contact: "Daeho Jeong" <daehojeong@google.com>
> +Description: Show how many dirty segments have been reclaimed by GC during
> + a specific GC urgent mode (1: GC urgent high, 2: GC urgent low)
> + You can re-initialize this value to "0".
> +
> +What: /sys/fs/f2fs/<disk>/gc_urgent_dirty_segs_mode
> +Date: July 2021
> +Contact: "Daeho Jeong" <daehojeong@google.com>
> +Description: You can control for which gc urgent mode the "gc_urgent_dirty_segs"
> + node shows (1: GC urgent high, 2: GC urgent low). You can set the
> + value to "0" when you want not to select one of them.
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 16ce1ade9fa6..d838c373f188 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1728,6 +1728,11 @@ struct f2fs_sb_info {
> struct kmem_cache *inline_xattr_slab; /* inline xattr entry */
> unsigned int inline_xattr_slab_size; /* default inline xattr slab size */
>
> + /* For reclaimed dirty segs statistics per each GC urgent mode */
> + unsigned int gc_dirty_segs_mode; /* GC state for reclaimed dirty segments */
> + u64 gc_urgent_high_dirty_segs; /* Reclaimed dirty segs in GC_URGENT_HIGH */
> + u64 gc_urgent_low_dirty_segs; /* Reclaimed dirty segs in GC_URGENT_LOW */

How about modifying like this? And, can we add this in debug/f2fs/status?

enum {
GC_NORMAL,
GC_URGENT_HIGH,
GC_URGENT_LOW,
GC_IDLE_CB,
GC_IDLE_GREEDY,
GC_IDLE_AT,
};

#define GC_URGENT_MAX (GC_URGENT_LOW + 1)
unsigned int reclaimed_segs[GC_URGENT_MAX];

> +
> #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 */
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index da5947b30142..233e2a500379 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -1648,6 +1648,10 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
> force_migrate);
>
> stat_inc_seg_count(sbi, type, gc_type);
> + if (sbi->gc_dirty_segs_mode == GC_URGENT_HIGH)

if (sbi->gc_mode < GC_URGENT_MAX)
sbi->gc_reclaimed_segs[sbi->gc_mode]++;

> + sbi->gc_urgent_high_dirty_segs++;
> + else if (sbi->gc_dirty_segs_mode == GC_URGENT_LOW)
> + sbi->gc_urgent_low_dirty_segs++;
> migrated++;
>
> freed:
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 6642246206bd..9ede97fe12cf 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -307,6 +307,25 @@ static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
> return sysfs_emit(buf, "%u\n", sbi->compr_new_inode);
> #endif
>
> + if (!strcmp(a->attr.name, "gc_urgent_dirty_segs_mode")) {
> + if (sbi->gc_dirty_segs_mode == GC_NORMAL)
> + return sysfs_emit(buf, "0\n");

"0:gc_normal"?

> + else if (sbi->gc_dirty_segs_mode == GC_URGENT_HIGH)
> + return sysfs_emit(buf, "1\n");

"1:gc_urgent_high"?

> + else if (sbi->gc_dirty_segs_mode == GC_URGENT_LOW)
> + return sysfs_emit(buf, "2\n");

"2:gc_urgent_low"?

> + }
> +
> + if (!strcmp(a->attr.name, "gc_urgent_dirty_segs")) {
> + if (sbi->gc_dirty_segs_mode == GC_URGENT_HIGH)
> + return sysfs_emit(buf, "%llu\n",
> + sbi->gc_urgent_high_dirty_segs);
> + if (sbi->gc_dirty_segs_mode == GC_URGENT_LOW)
> + return sysfs_emit(buf, "%llu\n",
> + sbi->gc_urgent_low_dirty_segs);
> + return sysfs_emit(buf, "0\n");
> + }
> +
> ui = (unsigned int *)(ptr + a->offset);
> return sprintf(buf, "%u\n", *ui);
> @@ -515,6 +534,28 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
> return count;
> }
>
> + if (!strcmp(a->attr.name, "gc_urgent_dirty_segs_mode")) {
> + if (t == 0)
> + sbi->gc_dirty_segs_mode = GC_NORMAL;
> + else if (t == 1)
> + sbi->gc_dirty_segs_mode = GC_URGENT_HIGH;
> + else if (t == 2)
> + sbi->gc_dirty_segs_mode = GC_URGENT_LOW;
> + else
> + return -EINVAL;
> + return count;
> + }
> +
> + if (!strcmp(a->attr.name, "gc_urgent_dirty_segs")) {
> + if (t != 0 || sbi->gc_dirty_segs_mode == GC_NORMAL)
> + return -EINVAL;
> + if (sbi->gc_dirty_segs_mode == GC_URGENT_HIGH)
> + sbi->gc_urgent_high_dirty_segs = 0;
> + else if (sbi->gc_dirty_segs_mode == GC_URGENT_LOW)
> + sbi->gc_urgent_low_dirty_segs = 0;
> + return count;
> + }
> +
> *ui = (unsigned int)t;
>
> return count;
> @@ -740,6 +781,9 @@ F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_candidate_count, max_candidate_cou
> F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_weight, age_weight);
> F2FS_RW_ATTR(ATGC_INFO, atgc_management, atgc_age_threshold, age_threshold);
>
> +F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_urgent_dirty_segs_mode, gc_dirty_segs_mode);
> +F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_urgent_dirty_segs, gc_urgent_high_dirty_segs);
> +
> #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
> static struct attribute *f2fs_attrs[] = {
> ATTR_LIST(gc_urgent_sleep_time),
> @@ -812,6 +856,8 @@ static struct attribute *f2fs_attrs[] = {
> ATTR_LIST(atgc_candidate_count),
> ATTR_LIST(atgc_age_weight),
> ATTR_LIST(atgc_age_threshold),
> + ATTR_LIST(gc_urgent_dirty_segs_mode),
> + ATTR_LIST(gc_urgent_dirty_segs),
> NULL,
> };
> ATTRIBUTE_GROUPS(f2fs);
> --
> 2.32.0.93.g670b81a890-goog
>
>
>
> _______________________________________________
> Linux-f2fs-devel mailing list
> Linux-f2fs-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel

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