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Date: Wed, 4 Jan 2017 16:45:40 +0800
From: Chao Yu <yuchao0@...wei.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>, <linux-kernel@...r.kernel.org>,
<linux-fsdevel@...r.kernel.org>,
<linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [PATCH 06/10] f2fs: show the max number of atomic operations
On 2016/12/31 2:51, Jaegeuk Kim wrote:
> This patch adds to show the max number of atomic operations which are
> conducting concurrently.
>
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
> fs/f2fs/debug.c | 7 +++++++
> fs/f2fs/f2fs.h | 17 +++++++++++++++++
> fs/f2fs/file.c | 12 +++++++++---
> 3 files changed, 33 insertions(+), 3 deletions(-)
>
> diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
> index fbd5184140d0..29cdf0c1da1d 100644
> --- a/fs/f2fs/debug.c
> +++ b/fs/f2fs/debug.c
> @@ -50,6 +50,8 @@ static void update_general_status(struct f2fs_sb_info *sbi)
> si->ndirty_files = sbi->ndirty_inode[FILE_INODE];
> si->ndirty_all = sbi->ndirty_inode[DIRTY_META];
> si->inmem_pages = get_pages(sbi, F2FS_INMEM_PAGES);
> + si->aw_cnt = atomic_read(&sbi->aw_cnt);
> + si->max_aw_cnt = atomic_read(&sbi->max_aw_cnt);
> si->nr_wb_cp_data = get_pages(sbi, F2FS_WB_CP_DATA);
> si->nr_wb_data = get_pages(sbi, F2FS_WB_DATA);
> si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
> @@ -256,6 +258,8 @@ static int stat_show(struct seq_file *s, void *v)
> si->inline_dir);
> seq_printf(s, " - Orphan Inode: %u\n",
> si->orphans);
> + seq_printf(s, " - Atomic write count: %4d (Max. %4d)\n",
> + si->aw_cnt, si->max_aw_cnt);
> seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
> si->main_area_segs, si->main_area_sections,
> si->main_area_zones);
> @@ -414,6 +418,9 @@ int f2fs_build_stats(struct f2fs_sb_info *sbi)
> atomic_set(&sbi->inline_dir, 0);
> atomic_set(&sbi->inplace_count, 0);
>
> + atomic_set(&sbi->aw_cnt, 0);
> + atomic_set(&sbi->max_aw_cnt, 0);
> +
> mutex_lock(&f2fs_stat_mutex);
> list_add_tail(&si->stat_list, &f2fs_stat_list);
> mutex_unlock(&f2fs_stat_mutex);
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 0d7eaddef4a0..bdcfe2a9b532 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -884,6 +884,8 @@ struct f2fs_sb_info {
> atomic_t inline_xattr; /* # of inline_xattr inodes */
> atomic_t inline_inode; /* # of inline_data inodes */
> atomic_t inline_dir; /* # of inline_dentry inodes */
> + atomic_t aw_cnt; /* # of atomic writes */
> + atomic_t max_aw_cnt; /* max # of atomic writes */
> int bg_gc; /* background gc calls */
> unsigned int ndirty_inode[NR_INODE_TYPE]; /* # of dirty inodes */
> #endif
> @@ -2236,6 +2238,7 @@ struct f2fs_stat_info {
> int total_count, utilization;
> int bg_gc, nr_wb_cp_data, nr_wb_data;
> int inline_xattr, inline_inode, inline_dir, orphans;
> + int aw_cnt, max_aw_cnt;
> unsigned int valid_count, valid_node_count, valid_inode_count, discard_blks;
> unsigned int bimodal, avg_vblocks;
> int util_free, util_valid, util_invalid;
> @@ -2307,6 +2310,17 @@ static inline struct f2fs_stat_info *F2FS_STAT(struct f2fs_sb_info *sbi)
> ((sbi)->block_count[(curseg)->alloc_type]++)
> #define stat_inc_inplace_blocks(sbi) \
> (atomic_inc(&(sbi)->inplace_count))
> +#define stat_inc_atomic_write(inode) \
> + (atomic_inc(&F2FS_I_SB(inode)->aw_cnt));
> +#define stat_dec_atomic_write(inode) \
> + (atomic_dec(&F2FS_I_SB(inode)->aw_cnt));
> +#define stat_update_max_atomic_write(inode) \
> + do { \
> + int cur = atomic_read(&F2FS_I_SB(inode)->aw_cnt); \
> + int max = atomic_read(&F2FS_I_SB(inode)->max_aw_cnt); \
> + if (cur > max) \
> + atomic_set(&F2FS_I_SB(inode)->max_aw_cnt, cur); \
> + } while (0)
> #define stat_inc_seg_count(sbi, type, gc_type) \
> do { \
> struct f2fs_stat_info *si = F2FS_STAT(sbi); \
> @@ -2360,6 +2374,9 @@ void f2fs_destroy_root_stats(void);
> #define stat_dec_inline_inode(inode)
> #define stat_inc_inline_dir(inode)
> #define stat_dec_inline_dir(inode)
> +#define stat_inc_atomic_write(inode)
> +#define stat_dec_atomic_write(inode)
> +#define stat_update_max_atomic_write(inode)
> #define stat_inc_seg_type(sbi, curseg)
> #define stat_inc_block_count(sbi, curseg)
> #define stat_inc_inplace_blocks(sbi)
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 49f10dce817d..826fefc05fb1 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1542,6 +1542,8 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
> if (ret)
> clear_inode_flag(inode, FI_ATOMIC_FILE);
> out:
> + stat_inc_atomic_write(inode);
> + stat_update_max_atomic_write(inode);
> inode_unlock(inode);
> mnt_drop_write_file(filp);
> return ret;
> @@ -1571,9 +1573,11 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
> set_inode_flag(inode, FI_ATOMIC_FILE);
> goto err_out;
> }
> + ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true);
> + stat_dec_atomic_write(inode);
> + } else {
> + ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true);
> }
> -
> - ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true);
> err_out:
> inode_unlock(inode);
> mnt_drop_write_file(filp);
> @@ -1652,8 +1656,10 @@ static int f2fs_ioc_abort_volatile_write(struct file *filp)
>
> inode_lock(inode);
>
> - if (f2fs_is_atomic_file(inode))
> + if (f2fs_is_atomic_file(inode)) {
> drop_inmem_pages(inode);
> + stat_dec_atomic_write(inode);
Better to decline this count in drop_inmem_pages()?
Thanks,
> + }
> if (f2fs_is_volatile_file(inode)) {
> clear_inode_flag(inode, FI_VOLATILE_FILE);
> ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true);
>
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