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Message-ID: <a10baad2-350a-ea1b-c338-63b2bc58a26a@huawei.com>
Date: Wed, 1 Jul 2020 11:35:45 +0800
From: Chao Yu <yuchao0@...wei.com>
To: Daeho Jeong <daeho43@...il.com>, <linux-kernel@...r.kernel.org>,
<linux-f2fs-devel@...ts.sourceforge.net>, <kernel-team@...roid.com>
CC: Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs: add GC_URGENT_LOW mode in gc_urgent
On 2020/6/30 8:54, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@...gle.com>
>
> Added a new gc_urgent mode, GC_URGENT_LOW, in which mode
> F2FS will lower the bar of checking idle in order to
> process outstanding discard commands and GC a little bit
> aggressively.
>
> Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> ---
> Documentation/ABI/testing/sysfs-fs-f2fs | 4 +++-
> fs/f2fs/f2fs.h | 10 ++++++++--
> fs/f2fs/gc.c | 6 +++---
> fs/f2fs/segment.c | 4 ++--
> fs/f2fs/sysfs.c | 6 ++++--
> 5 files changed, 20 insertions(+), 10 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index 4bb93a06d8ab..7f730c4c8df2 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -229,7 +229,9 @@ Date: August 2017
> Contact: "Jaegeuk Kim" <jaegeuk@...nel.org>
> Description: Do background GC agressively when set. When gc_urgent = 1,
> background thread starts to do GC by given gc_urgent_sleep_time
> - interval. It is set to 0 by default.
> + interval. When gc_urgent = 2, F2FS will lower the bar of
> + checking idle in order to process outstanding discard commands
> + and GC a little bit aggressively. It is set to 0 by default.
>
> What: /sys/fs/f2fs/<disk>/gc_urgent_sleep_time
> Date: August 2017
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index e6e47618a357..4b28fd42fdbc 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1283,7 +1283,8 @@ enum {
> GC_NORMAL,
> GC_IDLE_CB,
> GC_IDLE_GREEDY,
> - GC_URGENT,
> + GC_URGENT_HIGH,
> + GC_URGENT_LOW,
> };
>
> enum {
> @@ -1540,6 +1541,7 @@ struct f2fs_sb_info {
> unsigned int cur_victim_sec; /* current victim section num */
> unsigned int gc_mode; /* current GC state */
> unsigned int next_victim_seg[2]; /* next segment in victim section */
> +
> /* for skip statistic */
> unsigned int atomic_files; /* # of opened atomic file */
> unsigned long long skipped_atomic_files[2]; /* FG_GC and BG_GC */
> @@ -2480,7 +2482,7 @@ static inline void *f2fs_kmem_cache_alloc(struct kmem_cache *cachep,
>
> static inline bool is_idle(struct f2fs_sb_info *sbi, int type)
> {
> - if (sbi->gc_mode == GC_URGENT)
> + if (sbi->gc_mode == GC_URGENT_HIGH)
> return true;
>
> if (get_pages(sbi, F2FS_RD_DATA) || get_pages(sbi, F2FS_RD_NODE) ||
> @@ -2498,6 +2500,10 @@ static inline bool is_idle(struct f2fs_sb_info *sbi, int type)
> atomic_read(&SM_I(sbi)->fcc_info->queued_flush))
> return false;
>
> + if (sbi->gc_mode == GC_URGENT_LOW &&
> + (type == DISCARD_TIME || type == GC_TIME))
> + return true;
> +
> return f2fs_time_over(sbi, type);
> }
>
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 6eec3b2d606d..3b718da69910 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -82,7 +82,7 @@ static int gc_thread_func(void *data)
> * invalidated soon after by user update or deletion.
> * So, I'd like to wait some time to collect dirty segments.
> */
> - if (sbi->gc_mode == GC_URGENT) {
> + if (sbi->gc_mode == GC_URGENT_HIGH) {
> wait_ms = gc_th->urgent_sleep_time;
> down_write(&sbi->gc_lock);
> goto do_gc;
> @@ -176,7 +176,7 @@ static int select_gc_type(struct f2fs_sb_info *sbi, int gc_type)
> gc_mode = GC_CB;
> break;
> case GC_IDLE_GREEDY:
> - case GC_URGENT:
> + case GC_URGENT_HIGH:
> gc_mode = GC_GREEDY;
> break;
> }
> @@ -211,7 +211,7 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
> * foreground GC and urgent GC cases.
> */
> if (gc_type != FG_GC &&
> - (sbi->gc_mode != GC_URGENT) &&
> + (sbi->gc_mode != GC_URGENT_HIGH) &&
> p->max_search > sbi->max_victim_search)
> p->max_search = sbi->max_victim_search;
>
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index b45e473508a9..5924b3965ae4 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -174,7 +174,7 @@ bool f2fs_need_SSR(struct f2fs_sb_info *sbi)
>
> if (f2fs_lfs_mode(sbi))
> return false;
> - if (sbi->gc_mode == GC_URGENT)
> + if (sbi->gc_mode == GC_URGENT_HIGH)
> return true;
> if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
> return true;
> @@ -1759,7 +1759,7 @@ static int issue_discard_thread(void *data)
> continue;
> }
>
> - if (sbi->gc_mode == GC_URGENT)
> + if (sbi->gc_mode == GC_URGENT_HIGH)
> __init_discard_policy(sbi, &dpolicy, DPOLICY_FORCE, 1);
>
> sb_start_intwrite(sbi->sb);
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index e877c59b9fdb..ab40e1f89f23 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -350,14 +350,16 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
> return -EINVAL;
>
> if (!strcmp(a->attr.name, "gc_urgent")) {
> - if (t >= 1) {
> - sbi->gc_mode = GC_URGENT;
> + if (t == 1) {
> + sbi->gc_mode = GC_URGENT_HIGH;
> if (sbi->gc_thread) {
> sbi->gc_thread->gc_wake = 1;
> wake_up_interruptible_all(
> &sbi->gc_thread->gc_wait_queue_head);
> wake_up_discard_thread(sbi, true);
> }
> + } else if (t == 2) {
> + sbi->gc_mode = GC_URGENT_LOW;
> } else {
> sbi->gc_mode = GC_NORMAL;
As functionality description in sysfs doc, shouldn't it be:
if (t == 0) {
sbi->gc_mode = GC_NORMAL;
} else if (t == 1) {
sbi->gc_mode = GC_URGENT_HIGH;
...
} else if (t == 2) {
sbi->gc_mode = GC_URGENT_LOW;
} else {
return -EINVAL;
}
return count;
> }
>
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