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linux/fs/f2fs/debug.c
Namjae Jeon 4589d25d01 f2fs: fix the debugfs entry creation path 
As the "status" debugfs entry will be maintained for entire F2FS filesystem
irrespective of the number of partitions.
So, we can move the initialization to the init part of the f2fs and destroy will
be done from exit part. After making changes, for individual partition mount -
entry creation code will not be executed.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
2013-01-15 20:19:15 +09:00

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/*
* f2fs debugging statistics
*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
* Copyright (c) 2012 Linux Foundation
* Copyright (c) 2012 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/fs.h>
#include <linux/backing-dev.h>
#include <linux/proc_fs.h>
#include <linux/f2fs_fs.h>
#include <linux/blkdev.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include "gc.h"
static LIST_HEAD(f2fs_stat_list);
static struct dentry *debugfs_root;
static DEFINE_MUTEX(f2fs_stat_mutex);
static void update_general_status(struct f2fs_sb_info *sbi)
{
struct f2fs_stat_info *si = sbi->stat_info;
int i;
/* valid check of the segment numbers */
si->hit_ext = sbi->read_hit_ext;
si->total_ext = sbi->total_hit_ext;
si->ndirty_node = get_pages(sbi, F2FS_DIRTY_NODES);
si->ndirty_dent = get_pages(sbi, F2FS_DIRTY_DENTS);
si->ndirty_dirs = sbi->n_dirty_dirs;
si->ndirty_meta = get_pages(sbi, F2FS_DIRTY_META);
si->total_count = (int)sbi->user_block_count / sbi->blocks_per_seg;
si->rsvd_segs = reserved_segments(sbi);
si->overp_segs = overprovision_segments(sbi);
si->valid_count = valid_user_blocks(sbi);
si->valid_node_count = valid_node_count(sbi);
si->valid_inode_count = valid_inode_count(sbi);
si->utilization = utilization(sbi);
si->free_segs = free_segments(sbi);
si->free_secs = free_sections(sbi);
si->prefree_count = prefree_segments(sbi);
si->dirty_count = dirty_segments(sbi);
si->node_pages = sbi->node_inode->i_mapping->nrpages;
si->meta_pages = sbi->meta_inode->i_mapping->nrpages;
si->nats = NM_I(sbi)->nat_cnt;
si->sits = SIT_I(sbi)->dirty_sentries;
si->fnids = NM_I(sbi)->fcnt;
si->bg_gc = sbi->bg_gc;
si->util_free = (int)(free_user_blocks(sbi) >> sbi->log_blocks_per_seg)
* 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
/ 2;
si->util_valid = (int)(written_block_count(sbi) >>
sbi->log_blocks_per_seg)
* 100 / (int)(sbi->user_block_count >> sbi->log_blocks_per_seg)
/ 2;
si->util_invalid = 50 - si->util_free - si->util_valid;
for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_NODE; i++) {
struct curseg_info *curseg = CURSEG_I(sbi, i);
si->curseg[i] = curseg->segno;
si->cursec[i] = curseg->segno / sbi->segs_per_sec;
si->curzone[i] = si->cursec[i] / sbi->secs_per_zone;
}
for (i = 0; i < 2; i++) {
si->segment_count[i] = sbi->segment_count[i];
si->block_count[i] = sbi->block_count[i];
}
}
/*
* This function calculates BDF of every segments
*/
static void update_sit_info(struct f2fs_sb_info *sbi)
{
struct f2fs_stat_info *si = sbi->stat_info;
unsigned int blks_per_sec, hblks_per_sec, total_vblocks, bimodal, dist;
struct sit_info *sit_i = SIT_I(sbi);
unsigned int segno, vblocks;
int ndirty = 0;
bimodal = 0;
total_vblocks = 0;
blks_per_sec = sbi->segs_per_sec * (1 << sbi->log_blocks_per_seg);
hblks_per_sec = blks_per_sec / 2;
mutex_lock(&sit_i->sentry_lock);
for (segno = 0; segno < TOTAL_SEGS(sbi); segno += sbi->segs_per_sec) {
vblocks = get_valid_blocks(sbi, segno, sbi->segs_per_sec);
dist = abs(vblocks - hblks_per_sec);
bimodal += dist * dist;
if (vblocks > 0 && vblocks < blks_per_sec) {
total_vblocks += vblocks;
ndirty++;
}
}
mutex_unlock(&sit_i->sentry_lock);
dist = sbi->total_sections * hblks_per_sec * hblks_per_sec / 100;
si->bimodal = bimodal / dist;
if (si->dirty_count)
si->avg_vblocks = total_vblocks / ndirty;
else
si->avg_vblocks = 0;
}
/*
* This function calculates memory footprint.
*/
static void update_mem_info(struct f2fs_sb_info *sbi)
{
struct f2fs_stat_info *si = sbi->stat_info;
unsigned npages;
if (si->base_mem)
goto get_cache;
si->base_mem = sizeof(struct f2fs_sb_info) + sbi->sb->s_blocksize;
si->base_mem += 2 * sizeof(struct f2fs_inode_info);
si->base_mem += sizeof(*sbi->ckpt);
/* build sm */
si->base_mem += sizeof(struct f2fs_sm_info);
/* build sit */
si->base_mem += sizeof(struct sit_info);
si->base_mem += TOTAL_SEGS(sbi) * sizeof(struct seg_entry);
si->base_mem += f2fs_bitmap_size(TOTAL_SEGS(sbi));
si->base_mem += 2 * SIT_VBLOCK_MAP_SIZE * TOTAL_SEGS(sbi);
if (sbi->segs_per_sec > 1)
si->base_mem += sbi->total_sections *
sizeof(struct sec_entry);
si->base_mem += __bitmap_size(sbi, SIT_BITMAP);
/* build free segmap */
si->base_mem += sizeof(struct free_segmap_info);
si->base_mem += f2fs_bitmap_size(TOTAL_SEGS(sbi));
si->base_mem += f2fs_bitmap_size(sbi->total_sections);
/* build curseg */
si->base_mem += sizeof(struct curseg_info) * NR_CURSEG_TYPE;
si->base_mem += PAGE_CACHE_SIZE * NR_CURSEG_TYPE;
/* build dirty segmap */
si->base_mem += sizeof(struct dirty_seglist_info);
si->base_mem += NR_DIRTY_TYPE * f2fs_bitmap_size(TOTAL_SEGS(sbi));
si->base_mem += 2 * f2fs_bitmap_size(TOTAL_SEGS(sbi));
/* buld nm */
si->base_mem += sizeof(struct f2fs_nm_info);
si->base_mem += __bitmap_size(sbi, NAT_BITMAP);
/* build gc */
si->base_mem += sizeof(struct f2fs_gc_kthread);
get_cache:
/* free nids */
si->cache_mem = NM_I(sbi)->fcnt;
si->cache_mem += NM_I(sbi)->nat_cnt;
npages = sbi->node_inode->i_mapping->nrpages;
si->cache_mem += npages << PAGE_CACHE_SHIFT;
npages = sbi->meta_inode->i_mapping->nrpages;
si->cache_mem += npages << PAGE_CACHE_SHIFT;
si->cache_mem += sbi->n_orphans * sizeof(struct orphan_inode_entry);
si->cache_mem += sbi->n_dirty_dirs * sizeof(struct dir_inode_entry);
}
static int stat_show(struct seq_file *s, void *v)
{
struct f2fs_stat_info *si, *next;
int i = 0;
int j;
mutex_lock(&f2fs_stat_mutex);
list_for_each_entry_safe(si, next, &f2fs_stat_list, stat_list) {
update_general_status(si->sbi);
seq_printf(s, "\n=====[ partition info. #%d ]=====\n", i++);
seq_printf(s, "[SB: 1] [CP: 2] [SIT: %d] [NAT: %d] ",
si->sit_area_segs, si->nat_area_segs);
seq_printf(s, "[SSA: %d] [MAIN: %d",
si->ssa_area_segs, si->main_area_segs);
seq_printf(s, "(OverProv:%d Resv:%d)]\n\n",
si->overp_segs, si->rsvd_segs);
seq_printf(s, "Utilization: %d%% (%d valid blocks)\n",
si->utilization, si->valid_count);
seq_printf(s, " - Node: %u (Inode: %u, ",
si->valid_node_count, si->valid_inode_count);
seq_printf(s, "Other: %u)\n - Data: %u\n",
si->valid_node_count - si->valid_inode_count,
si->valid_count - si->valid_node_count);
seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
si->main_area_segs, si->main_area_sections,
si->main_area_zones);
seq_printf(s, " - COLD data: %d, %d, %d\n",
si->curseg[CURSEG_COLD_DATA],
si->cursec[CURSEG_COLD_DATA],
si->curzone[CURSEG_COLD_DATA]);
seq_printf(s, " - WARM data: %d, %d, %d\n",
si->curseg[CURSEG_WARM_DATA],
si->cursec[CURSEG_WARM_DATA],
si->curzone[CURSEG_WARM_DATA]);
seq_printf(s, " - HOT data: %d, %d, %d\n",
si->curseg[CURSEG_HOT_DATA],
si->cursec[CURSEG_HOT_DATA],
si->curzone[CURSEG_HOT_DATA]);
seq_printf(s, " - Dir dnode: %d, %d, %d\n",
si->curseg[CURSEG_HOT_NODE],
si->cursec[CURSEG_HOT_NODE],
si->curzone[CURSEG_HOT_NODE]);
seq_printf(s, " - File dnode: %d, %d, %d\n",
si->curseg[CURSEG_WARM_NODE],
si->cursec[CURSEG_WARM_NODE],
si->curzone[CURSEG_WARM_NODE]);
seq_printf(s, " - Indir nodes: %d, %d, %d\n",
si->curseg[CURSEG_COLD_NODE],
si->cursec[CURSEG_COLD_NODE],
si->curzone[CURSEG_COLD_NODE]);
seq_printf(s, "\n - Valid: %d\n - Dirty: %d\n",
si->main_area_segs - si->dirty_count -
si->prefree_count - si->free_segs,
si->dirty_count);
seq_printf(s, " - Prefree: %d\n - Free: %d (%d)\n\n",
si->prefree_count, si->free_segs, si->free_secs);
seq_printf(s, "GC calls: %d (BG: %d)\n",
si->call_count, si->bg_gc);
seq_printf(s, " - data segments : %d\n", si->data_segs);
seq_printf(s, " - node segments : %d\n", si->node_segs);
seq_printf(s, "Try to move %d blocks\n", si->tot_blks);
seq_printf(s, " - data blocks : %d\n", si->data_blks);
seq_printf(s, " - node blocks : %d\n", si->node_blks);
seq_printf(s, "\nExtent Hit Ratio: %d / %d\n",
si->hit_ext, si->total_ext);
seq_printf(s, "\nBalancing F2FS Async:\n");
seq_printf(s, " - nodes %4d in %4d\n",
si->ndirty_node, si->node_pages);
seq_printf(s, " - dents %4d in dirs:%4d\n",
si->ndirty_dent, si->ndirty_dirs);
seq_printf(s, " - meta %4d in %4d\n",
si->ndirty_meta, si->meta_pages);
seq_printf(s, " - NATs %5d > %lu\n",
si->nats, NM_WOUT_THRESHOLD);
seq_printf(s, " - SITs: %5d\n - free_nids: %5d\n",
si->sits, si->fnids);
seq_printf(s, "\nDistribution of User Blocks:");
seq_printf(s, " [ valid | invalid | free ]\n");
seq_printf(s, " [");
for (j = 0; j < si->util_valid; j++)
seq_printf(s, "-");
seq_printf(s, "|");
for (j = 0; j < si->util_invalid; j++)
seq_printf(s, "-");
seq_printf(s, "|");
for (j = 0; j < si->util_free; j++)
seq_printf(s, "-");
seq_printf(s, "]\n\n");
seq_printf(s, "SSR: %u blocks in %u segments\n",
si->block_count[SSR], si->segment_count[SSR]);
seq_printf(s, "LFS: %u blocks in %u segments\n",
si->block_count[LFS], si->segment_count[LFS]);
/* segment usage info */
update_sit_info(si->sbi);
seq_printf(s, "\nBDF: %u, avg. vblocks: %u\n",
si->bimodal, si->avg_vblocks);
/* memory footprint */
update_mem_info(si->sbi);
seq_printf(s, "\nMemory: %u KB = static: %u + cached: %u\n",
(si->base_mem + si->cache_mem) >> 10,
si->base_mem >> 10, si->cache_mem >> 10);
}
mutex_unlock(&f2fs_stat_mutex);
return 0;
}
static int stat_open(struct inode *inode, struct file *file)
{
return single_open(file, stat_show, inode->i_private);
}
static const struct file_operations stat_fops = {
.open = stat_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
int f2fs_build_stats(struct f2fs_sb_info *sbi)
{
struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
struct f2fs_stat_info *si;
sbi->stat_info = kzalloc(sizeof(struct f2fs_stat_info), GFP_KERNEL);
if (!sbi->stat_info)
return -ENOMEM;
si = sbi->stat_info;
si->all_area_segs = le32_to_cpu(raw_super->segment_count);
si->sit_area_segs = le32_to_cpu(raw_super->segment_count_sit);
si->nat_area_segs = le32_to_cpu(raw_super->segment_count_nat);
si->ssa_area_segs = le32_to_cpu(raw_super->segment_count_ssa);
si->main_area_segs = le32_to_cpu(raw_super->segment_count_main);
si->main_area_sections = le32_to_cpu(raw_super->section_count);
si->main_area_zones = si->main_area_sections /
le32_to_cpu(raw_super->secs_per_zone);
si->sbi = sbi;
mutex_lock(&f2fs_stat_mutex);
list_add_tail(&si->stat_list, &f2fs_stat_list);
mutex_unlock(&f2fs_stat_mutex);
return 0;
}
void f2fs_destroy_stats(struct f2fs_sb_info *sbi)
{
struct f2fs_stat_info *si = sbi->stat_info;
mutex_lock(&f2fs_stat_mutex);
list_del(&si->stat_list);
mutex_unlock(&f2fs_stat_mutex);
kfree(sbi->stat_info);
}
void __init f2fs_create_root_stats(void)
{
debugfs_root = debugfs_create_dir("f2fs", NULL);
if (debugfs_root)
debugfs_create_file("status", S_IRUGO, debugfs_root,
NULL, &stat_fops);
}
void f2fs_destroy_root_stats(void)
{
debugfs_remove_recursive(debugfs_root);
debugfs_root = NULL;
}
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