diff options
| -rw-r--r-- | fs/f2fs/debug.c | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c new file mode 100644 index 00000000000..a56181c1b28 --- /dev/null +++ b/fs/f2fs/debug.c @@ -0,0 +1,361 @@ +/** + * 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; + +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; + + list_for_each_entry_safe(si, next, &f2fs_stat_list, stat_list) { + + mutex_lock(&si->stat_lock); + if (!si->sbi) { + mutex_unlock(&si->stat_lock); + continue; + } + update_general_status(si->sbi); + + seq_printf(s, "\n=====[ partition info. #%d ]=====\n", i++); + seq_printf(s, "[SB: 1] [CP: 2] [NAT: %d] [SIT: %d] ", + si->nat_area_segs, si->sit_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(&si->stat_lock); + } + 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, +}; + +static int init_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; + mutex_init(&si->stat_lock); + list_add_tail(&si->stat_list, &f2fs_stat_list); + + 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; + return 0; +} + +int f2fs_build_stats(struct f2fs_sb_info *sbi) +{ + int retval; + + retval = init_stats(sbi); + if (retval) + return retval; + + if (!debugfs_root) + debugfs_root = debugfs_create_dir("f2fs", NULL); + + debugfs_create_file("status", S_IRUGO, debugfs_root, NULL, &stat_fops); + return 0; +} + +void f2fs_destroy_stats(struct f2fs_sb_info *sbi) +{ + struct f2fs_stat_info *si = sbi->stat_info; + + list_del(&si->stat_list); + mutex_lock(&si->stat_lock); + si->sbi = NULL; + mutex_unlock(&si->stat_lock); + kfree(sbi->stat_info); +} + +void destroy_root_stats(void) +{ + debugfs_remove_recursive(debugfs_root); + debugfs_root = NULL; +} |