Commit fc7100ea authored by Hridya Valsaraju's avatar Hridya Valsaraju Committed by Jaegeuk Kim
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f2fs: Add f2fs stats to sysfs 



Currently f2fs stats are only available from /d/f2fs/status. This patch
adds some of the f2fs stats to sysfs so that they are accessible even
when debugfs is not mounted.

The following sysfs nodes are added:
-/sys/fs/f2fs/<disk>/free_segments
-/sys/fs/f2fs/<disk>/cp_foreground_calls
-/sys/fs/f2fs/<disk>/cp_background_calls
-/sys/fs/f2fs/<disk>/gc_foreground_calls
-/sys/fs/f2fs/<disk>/gc_background_calls
-/sys/fs/f2fs/<disk>/moved_blocks_foreground
-/sys/fs/f2fs/<disk>/moved_blocks_background
-/sys/fs/f2fs/<disk>/avg_vblocks

Signed-off-by: default avatarHridya Valsaraju <hridya@google.com>
[Jaegeuk Kim: allow STAT_FS without DEBUG_FS]
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent f5fa7c8b

Documentation/ABI/testing/sysfs-fs-f2fs

+47 −0
Original line number Diff line number Diff line
@@ -271,3 +271,50 @@ Date July 2019 
Contact:	"Daniel Rosenberg" <drosen@google.com>

Description:	Displays name and version of the encoding set for the filesystem.

		If no encoding is set, displays (none)



What:		/sys/fs/f2fs/<disk>/free_segments

Date:		September 2019

Contact:	"Hridya Valsaraju" <hridya@google.com>

Description:	Number of free segments in disk.



What:		/sys/fs/f2fs/<disk>/cp_foreground_calls

Date:		September 2019

Contact:	"Hridya Valsaraju" <hridya@google.com>

Description:	Number of checkpoint operations performed on demand. Available when

		CONFIG_F2FS_STAT_FS=y.



What:		/sys/fs/f2fs/<disk>/cp_background_calls

Date:		September 2019

Contact:	"Hridya Valsaraju" <hridya@google.com>

Description:	Number of checkpoint operations performed in the background to

		free segments. Available when CONFIG_F2FS_STAT_FS=y.



What:		/sys/fs/f2fs/<disk>/gc_foreground_calls

Date:		September 2019

Contact:	"Hridya Valsaraju" <hridya@google.com>

Description:	Number of garbage collection operations performed on demand.

		Available when CONFIG_F2FS_STAT_FS=y.



What:		/sys/fs/f2fs/<disk>/gc_background_calls

Date:		September 2019

Contact:	"Hridya Valsaraju" <hridya@google.com>

Description:	Number of garbage collection operations triggered in background.

		Available when CONFIG_F2FS_STAT_FS=y.



What:		/sys/fs/f2fs/<disk>/moved_blocks_foreground

Date:		September 2019

Contact:	"Hridya Valsaraju" <hridya@google.com>

Description:	Number of blocks moved by garbage collection in foreground.

		Available when CONFIG_F2FS_STAT_FS=y.



What:		/sys/fs/f2fs/<disk>/moved_blocks_background

Date:		September 2019

Contact:	"Hridya Valsaraju" <hridya@google.com>

Description:	Number of blocks moved by garbage collection in background.

		Available when CONFIG_F2FS_STAT_FS=y.



What:		/sys/fs/f2fs/<disk>/avg_vblocks

Date:		September 2019

Contact:	"Hridya Valsaraju" <hridya@google.com>

Description:	Average number of valid blocks.

		Available when CONFIG_F2FS_STAT_FS=y.

fs/f2fs/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -21,7 +21,7 @@ config F2FS_FS 


config F2FS_STAT_FS

	bool "F2FS Status Information"

	depends on F2FS_FS && DEBUG_FS

	depends on F2FS_FS

	default y

	help

	  /sys/kernel/debug/f2fs/ contains information about all the partitions

fs/f2fs/debug.c

+43 −36
Original line number Diff line number Diff line
@@ -21,9 +21,45 @@ 
#include "gc.h"



static LIST_HEAD(f2fs_stat_list);

static struct dentry *f2fs_debugfs_root;

static DEFINE_MUTEX(f2fs_stat_mutex);

#ifdef CONFIG_DEBUG_FS

static struct dentry *f2fs_debugfs_root;

#endif



/*

 * This function calculates BDF of every segments

 */

void f2fs_update_sit_info(struct f2fs_sb_info *sbi)

{

	struct f2fs_stat_info *si = F2FS_STAT(sbi);

	unsigned long long blks_per_sec, hblks_per_sec, total_vblocks;

	unsigned long long bimodal, dist;

	unsigned int segno, vblocks;

	int ndirty = 0;



	bimodal = 0;

	total_vblocks = 0;

	blks_per_sec = BLKS_PER_SEC(sbi);

	hblks_per_sec = blks_per_sec / 2;

	for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {

		vblocks = get_valid_blocks(sbi, segno, true);

		dist = abs(vblocks - hblks_per_sec);

		bimodal += dist * dist;



		if (vblocks > 0 && vblocks < blks_per_sec) {

			total_vblocks += vblocks;

			ndirty++;

		}

	}

	dist = div_u64(MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec, 100);

	si->bimodal = div64_u64(bimodal, dist);

	if (si->dirty_count)

		si->avg_vblocks = div_u64(total_vblocks, ndirty);

	else

		si->avg_vblocks = 0;

}



#ifdef CONFIG_DEBUG_FS

static void update_general_status(struct f2fs_sb_info *sbi)

{

	struct f2fs_stat_info *si = F2FS_STAT(sbi);
@@ -116,7 +152,6 @@ static void update_general_status(struct f2fs_sb_info *sbi) 
	si->free_nids = NM_I(sbi)->nid_cnt[FREE_NID];

	si->avail_nids = NM_I(sbi)->available_nids;

	si->alloc_nids = NM_I(sbi)->nid_cnt[PREALLOC_NID];

	si->bg_gc = sbi->bg_gc;

	si->io_skip_bggc = sbi->io_skip_bggc;

	si->other_skip_bggc = sbi->other_skip_bggc;

	si->skipped_atomic_files[BG_GC] = sbi->skipped_atomic_files[BG_GC];
@@ -147,39 +182,6 @@ static void update_general_status(struct f2fs_sb_info *sbi) 
	si->inplace_count = atomic_read(&sbi->inplace_count);

}



/*

 * This function calculates BDF of every segments

 */

static void update_sit_info(struct f2fs_sb_info *sbi)

{

	struct f2fs_stat_info *si = F2FS_STAT(sbi);

	unsigned long long blks_per_sec, hblks_per_sec, total_vblocks;

	unsigned long long bimodal, dist;

	unsigned int segno, vblocks;

	int ndirty = 0;



	bimodal = 0;

	total_vblocks = 0;

	blks_per_sec = BLKS_PER_SEC(sbi);

	hblks_per_sec = blks_per_sec / 2;

	for (segno = 0; segno < MAIN_SEGS(sbi); segno += sbi->segs_per_sec) {

		vblocks = get_valid_blocks(sbi, segno, true);

		dist = abs(vblocks - hblks_per_sec);

		bimodal += dist * dist;



		if (vblocks > 0 && vblocks < blks_per_sec) {

			total_vblocks += vblocks;

			ndirty++;

		}

	}

	dist = div_u64(MAIN_SECS(sbi) * hblks_per_sec * hblks_per_sec, 100);

	si->bimodal = div64_u64(bimodal, dist);

	if (si->dirty_count)

		si->avg_vblocks = div_u64(total_vblocks, ndirty);

	else

		si->avg_vblocks = 0;

}



/*

 * This function calculates memory footprint.

 */
@@ -445,7 +447,7 @@ static int stat_show(struct seq_file *s, void *v) 
			   si->block_count[LFS], si->segment_count[LFS]);



		/* segment usage info */

		update_sit_info(si->sbi);

		f2fs_update_sit_info(si->sbi);

		seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",

			   si->bimodal, si->avg_vblocks);
@@ -465,6 +467,7 @@ static int stat_show(struct seq_file *s, void *v) 
}



DEFINE_SHOW_ATTRIBUTE(stat);

#endif



int f2fs_build_stats(struct f2fs_sb_info *sbi)

{
@@ -525,14 +528,18 @@ void f2fs_destroy_stats(struct f2fs_sb_info *sbi) 


void __init f2fs_create_root_stats(void)

{

#ifdef CONFIG_DEBUG_FS

	f2fs_debugfs_root = debugfs_create_dir("f2fs", NULL);



	debugfs_create_file("status", S_IRUGO, f2fs_debugfs_root, NULL,

			    &stat_fops);

#endif

}



void f2fs_destroy_root_stats(void)

{

#ifdef CONFIG_DEBUG_FS

	debugfs_remove_recursive(f2fs_debugfs_root);

	f2fs_debugfs_root = NULL;

#endif

}

fs/f2fs/f2fs.h

+5 −4
Original line number Diff line number Diff line
@@ -1435,7 +1435,6 @@ struct f2fs_sb_info { 
	atomic_t vw_cnt;			/* # of volatile writes */

	atomic_t max_aw_cnt;			/* max # of atomic writes */

	atomic_t max_vw_cnt;			/* max # of volatile writes */

	int bg_gc;				/* background gc calls */

	unsigned int io_skip_bggc;		/* skip background gc for in-flight IO */

	unsigned int other_skip_bggc;		/* skip background gc for other reasons */

	unsigned int ndirty_inode[NR_INODE_TYPE];	/* # of dirty inodes */
@@ -3460,7 +3459,7 @@ static inline struct f2fs_stat_info *F2FS_STAT(struct f2fs_sb_info *sbi) 
#define stat_inc_cp_count(si)		((si)->cp_count++)

#define stat_inc_bg_cp_count(si)	((si)->bg_cp_count++)

#define stat_inc_call_count(si)		((si)->call_count++)

#define stat_inc_bggc_count(sbi)	((sbi)->bg_gc++)

#define stat_inc_bggc_count(si)		((si)->bg_gc++)

#define stat_io_skip_bggc_count(sbi)	((sbi)->io_skip_bggc++)

#define stat_other_skip_bggc_count(sbi)	((sbi)->other_skip_bggc++)

#define stat_inc_dirty_inode(sbi, type)	((sbi)->ndirty_inode[type]++)
@@ -3584,6 +3583,7 @@ int f2fs_build_stats(struct f2fs_sb_info *sbi); 
void f2fs_destroy_stats(struct f2fs_sb_info *sbi);

void __init f2fs_create_root_stats(void);

void f2fs_destroy_root_stats(void);

void f2fs_update_sit_info(struct f2fs_sb_info *sbi);

#else

#define stat_inc_cp_count(si)				do { } while (0)

#define stat_inc_bg_cp_count(si)			do { } while (0)
@@ -3593,8 +3593,8 @@ void f2fs_destroy_root_stats(void); 
#define stat_other_skip_bggc_count(sbi)			do { } while (0)

#define stat_inc_dirty_inode(sbi, type)			do { } while (0)

#define stat_dec_dirty_inode(sbi, type)			do { } while (0)

#define stat_inc_total_hit(sb)				do { } while (0)

#define stat_inc_rbtree_node_hit(sb)			do { } while (0)

#define stat_inc_total_hit(sbi)				do { } while (0)

#define stat_inc_rbtree_node_hit(sbi)			do { } while (0)

#define stat_inc_largest_node_hit(sbi)			do { } while (0)

#define stat_inc_cached_node_hit(sbi)			do { } while (0)

#define stat_inc_inline_xattr(inode)			do { } while (0)
@@ -3626,6 +3626,7 @@ static inline int f2fs_build_stats(struct f2fs_sb_info *sbi) { return 0; } 
static inline void f2fs_destroy_stats(struct f2fs_sb_info *sbi) { }

static inline void __init f2fs_create_root_stats(void) { }

static inline void f2fs_destroy_root_stats(void) { }

static inline void update_sit_info(struct f2fs_sb_info *sbi) {}

#endif



extern const struct file_operations f2fs_dir_operations;

fs/f2fs/gc.c

+1 −1
Original line number Diff line number Diff line
@@ -99,7 +99,7 @@ static int gc_thread_func(void *data) 
		else

			increase_sleep_time(gc_th, &wait_ms);

do_gc:

		stat_inc_bggc_count(sbi);

		stat_inc_bggc_count(sbi->stat_info);



		/* if return value is not zero, no victim was selected */

		if (f2fs_gc(sbi, test_opt(sbi, FORCE_FG_GC), true, NULL_SEGNO))

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