From: Jaegeuk Kim <jaegeuk@kernel.org>
To: Chao Yu <yuchao0@huawei.com>
Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH v2 5/5] f2fs: support age threshold based garbage collection
Date: Mon, 31 Aug 2020 11:01:43 -0700 [thread overview]
Message-ID: <20200831180143.GB3665231@google.com> (raw)
In-Reply-To: <7986af8c-1fe9-7140-f1c0-d8b4a58f702c@huawei.com>
Hi Chao,
Applied. Thanks.
On 08/31, Chao Yu wrote:
> Hi Jaegeuk,
>
> I've changed code a bit to fix some bugs, including:
> - gc_idle = 3 (GC_IDLE_AT) description
> - disallow set gc_idle to 3 if atgc is off
> - keep compatibility with checkpoint disabling
>
> Could you please check and merge below diff?
>
> From: Chao Yu <yuchao0@huawei.com>
>
> Signed-off-by: Chao Yu <yuchao0@huawei.com>
> ---
> Documentation/ABI/testing/sysfs-fs-f2fs | 3 ++-
> fs/f2fs/gc.c | 12 +++++++++++-
> fs/f2fs/sysfs.c | 11 ++++++++---
> 3 files changed, 21 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index 7f730c4c8df2..834d0becae6d 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -22,7 +22,8 @@ Contact: "Namjae Jeon" <namjae.jeon@samsung.com>
> Description: Controls the victim selection policy for garbage collection.
> Setting gc_idle = 0(default) will disable this option. Setting
> gc_idle = 1 will select the Cost Benefit approach & setting
> - gc_idle = 2 will select the greedy approach.
> + gc_idle = 2 will select the greedy approach & setting
> + gc_idle = 3 will select the age-threshold based approach.
>
> What: /sys/fs/f2fs/<disk>/reclaim_segments
> Date: October 2013
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 6413886e52d4..3c0edb8b4cc5 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -388,6 +388,16 @@ static void add_victim_entry(struct f2fs_sb_info *sbi,
> unsigned long long mtime = 0;
> unsigned int i;
>
> + if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)) {
> + if (p->gc_mode == GC_AT &&
> + get_valid_blocks(sbi, segno, true) == 0)
> + return;
> +
> + if (p->alloc_mode == AT_SSR &&
> + get_seg_entry(sbi, segno)->ckpt_valid_blocks == 0)
> + return;
> + }
> +
> for (i = 0; i < sbi->segs_per_sec; i++)
> mtime += get_seg_entry(sbi, start + i)->mtime;
> mtime = div_u64(mtime, sbi->segs_per_sec);
> @@ -721,7 +731,7 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
> /* Don't touch checkpointed data */
> if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED) &&
> get_ckpt_valid_blocks(sbi, segno) &&
> - p.alloc_mode != SSR))
> + p.alloc_mode == LFS))
> goto next;
> if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
> goto next;
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 88ed9969cc86..bacfa9c35e6b 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -375,12 +375,17 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
> return count;
> }
> if (!strcmp(a->attr.name, "gc_idle")) {
> - if (t == GC_IDLE_CB)
> + if (t == GC_IDLE_CB) {
> sbi->gc_mode = GC_IDLE_CB;
> - else if (t == GC_IDLE_GREEDY)
> + } else if (t == GC_IDLE_GREEDY) {
> sbi->gc_mode = GC_IDLE_GREEDY;
> - else
> + } else if (t == GC_IDLE_AT) {
> + if (!sbi->am.atgc_enabled)
> + return -EINVAL;
> + sbi->gc_mode = GC_AT;
> + } else {
> sbi->gc_mode = GC_NORMAL;
> + }
> return count;
> }
>
> --
> 2.26.2
>
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next prev parent reply other threads:[~2020-08-31 18:02 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-04 13:14 [f2fs-dev] [PATCH v2 0/5] Support Age-Threshold based Garbage Collection for f2fs Chao Yu
2020-08-04 13:14 ` [f2fs-dev] [PATCH v2 1/5] f2fs: introduce inmem curseg Chao Yu
2020-08-04 13:14 ` [f2fs-dev] [PATCH v2 2/5] f2fs: record average update time of segment Chao Yu
2020-08-04 13:14 ` [f2fs-dev] [PATCH v2 3/5] f2fs: inherit mtime of original block during GC Chao Yu
2020-08-04 13:14 ` [f2fs-dev] [PATCH v2 4/5] f2fs: support 64-bits key in f2fs rb-tree node entry Chao Yu
2020-08-04 13:14 ` [f2fs-dev] [PATCH v2 5/5] f2fs: support age threshold based garbage collection Chao Yu
2020-08-25 19:34 ` Jaegeuk Kim
2020-08-26 6:48 ` Chao Yu
2020-08-31 6:59 ` Chao Yu
2020-08-31 18:01 ` Jaegeuk Kim [this message]
2020-09-01 3:24 ` Chao Yu
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