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Date: Mon, 1 Feb 2021 21:33:52 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Daeho Jeong <daeho43@...il.com>
Cc: linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: rename checkpoint=merge mount option
to checkpoint_merge
On 02/02, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@...gle.com>
>
> As checkpoint=merge comes in, mount option setting related to checkpoint
> had been mixed up and it became hard to understand. So, I separated
> this option from "checkpoint=" and made another mount option
> "checkpoint_merge" for this.
Thanks, merged to the original patch.
>
> Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> ---
> v2: renamed "checkpoint=merge" to "checkpoint_merge"
> ---
> Documentation/filesystems/f2fs.rst | 6 +++---
> fs/f2fs/super.c | 26 ++++++++++++++------------
> 2 files changed, 17 insertions(+), 15 deletions(-)
>
> diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
> index d0ead45dc706..475994ed8b15 100644
> --- a/Documentation/filesystems/f2fs.rst
> +++ b/Documentation/filesystems/f2fs.rst
> @@ -247,9 +247,9 @@ checkpoint=%s[:%u[%]] Set to "disable" to turn off checkpointing. Set to "enabl
> hide up to all remaining free space. The actual space that
> would be unusable can be viewed at /sys/fs/f2fs/<disk>/unusable
> This space is reclaimed once checkpoint=enable.
> - Here is another option "merge", which creates a kernel daemon
> - and makes it to merge concurrent checkpoint requests as much
> - as possible to eliminate redundant checkpoint issues. Plus,
> +checkpoint_merge When checkpoint is enabled, this can be used to create a kernel
> + daemon and make it to merge concurrent checkpoint requests as
> + much as possible to eliminate redundant checkpoint issues. Plus,
> we can eliminate the sluggish issue caused by slow checkpoint
> operation when the checkpoint is done in a process context in
> a cgroup having low i/o budget and cpu shares. To make this
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 56696f6cfa86..d8603e6c4916 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -145,6 +145,7 @@ enum {
> Opt_checkpoint_disable_cap_perc,
> Opt_checkpoint_enable,
> Opt_checkpoint_merge,
> + Opt_nocheckpoint_merge,
> Opt_compress_algorithm,
> Opt_compress_log_size,
> Opt_compress_extension,
> @@ -215,7 +216,8 @@ static match_table_t f2fs_tokens = {
> {Opt_checkpoint_disable_cap, "checkpoint=disable:%u"},
> {Opt_checkpoint_disable_cap_perc, "checkpoint=disable:%u%%"},
> {Opt_checkpoint_enable, "checkpoint=enable"},
> - {Opt_checkpoint_merge, "checkpoint=merge"},
> + {Opt_checkpoint_merge, "checkpoint_merge"},
> + {Opt_nocheckpoint_merge, "nocheckpoint_merge"},
> {Opt_compress_algorithm, "compress_algorithm=%s"},
> {Opt_compress_log_size, "compress_log_size=%u"},
> {Opt_compress_extension, "compress_extension=%s"},
> @@ -946,6 +948,9 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
> case Opt_checkpoint_merge:
> set_opt(sbi, MERGE_CHECKPOINT);
> break;
> + case Opt_nocheckpoint_merge:
> + clear_opt(sbi, MERGE_CHECKPOINT);
> + break;
> #ifdef CONFIG_F2FS_FS_COMPRESSION
> case Opt_compress_algorithm:
> if (!f2fs_sb_has_compression(sbi)) {
> @@ -1142,12 +1147,6 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
> return -EINVAL;
> }
>
> - if (test_opt(sbi, DISABLE_CHECKPOINT) &&
> - test_opt(sbi, MERGE_CHECKPOINT)) {
> - f2fs_err(sbi, "checkpoint=merge cannot be used with checkpoint=disable\n");
> - return -EINVAL;
> - }
> -
> /* Not pass down write hints if the number of active logs is lesser
> * than NR_CURSEG_PERSIST_TYPE.
> */
> @@ -1782,7 +1781,7 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
> seq_printf(seq, ",checkpoint=disable:%u",
> F2FS_OPTION(sbi).unusable_cap);
> if (test_opt(sbi, MERGE_CHECKPOINT))
> - seq_puts(seq, ",checkpoint=merge");
> + seq_puts(seq, ",checkpoint_merge");
> if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_POSIX)
> seq_printf(seq, ",fsync_mode=%s", "posix");
> else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
> @@ -1827,6 +1826,7 @@ static void default_options(struct f2fs_sb_info *sbi)
> sbi->sb->s_flags |= SB_LAZYTIME;
> set_opt(sbi, FLUSH_MERGE);
> set_opt(sbi, DISCARD);
> + clear_opt(sbi, MERGE_CHECKPOINT);
> if (f2fs_sb_has_blkzoned(sbi))
> F2FS_OPTION(sbi).fs_mode = FS_MODE_LFS;
> else
> @@ -2066,9 +2066,8 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
> }
> }
>
> - if (!test_opt(sbi, MERGE_CHECKPOINT)) {
> - f2fs_stop_ckpt_thread(sbi);
> - } else {
> + if (!test_opt(sbi, DISABLE_CHECKPOINT) &&
> + test_opt(sbi, MERGE_CHECKPOINT)) {
> err = f2fs_start_ckpt_thread(sbi);
> if (err) {
> f2fs_err(sbi,
> @@ -2076,6 +2075,8 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
> err);
> goto restore_gc;
> }
> + } else {
> + f2fs_stop_ckpt_thread(sbi);
> }
>
> /*
> @@ -3831,7 +3832,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>
> /* setup checkpoint request control and start checkpoint issue thread */
> f2fs_init_ckpt_req_control(sbi);
> - if (test_opt(sbi, MERGE_CHECKPOINT)) {
> + if (!test_opt(sbi, DISABLE_CHECKPOINT) &&
> + test_opt(sbi, MERGE_CHECKPOINT)) {
> err = f2fs_start_ckpt_thread(sbi);
> if (err) {
> f2fs_err(sbi,
> --
> 2.30.0.365.g02bc693789-goog
>
>
>
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> Linux-f2fs-devel@...ts.sourceforge.net
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