1// SPDX-License-Identifier: GPL-2.0 2/* 3 * f2fs iostat support 4 * 5 * Copyright 2021 Google LLC 6 * Author: Daeho Jeong <daehojeong@google.com> 7 */ 8 9#include <linux/fs.h> 10#include <linux/f2fs_fs.h> 11#include <linux/seq_file.h> 12 13#include "f2fs.h" 14#include "iostat.h" 15#include <trace/events/f2fs.h> 16 17static struct kmem_cache *bio_iostat_ctx_cache; 18static mempool_t *bio_iostat_ctx_pool; 19 20static inline unsigned long long iostat_get_avg_bytes(struct f2fs_sb_info *sbi, 21 enum iostat_type type) 22{ 23 return sbi->iostat_count[type] ? div64_u64(sbi->iostat_bytes[type], 24 sbi->iostat_count[type]) : 0; 25} 26 27#define IOSTAT_INFO_SHOW(name, type) \ 28 seq_printf(seq, "%-23s %-16llu %-16llu %-16llu\n", \ 29 name":", sbi->iostat_bytes[type], \ 30 sbi->iostat_count[type], \ 31 iostat_get_avg_bytes(sbi, type)) 32 33int __maybe_unused iostat_info_seq_show(struct seq_file *seq, void *offset) 34{ 35 struct super_block *sb = seq->private; 36 struct f2fs_sb_info *sbi = F2FS_SB(sb); 37 38 if (!sbi->iostat_enable) 39 return 0; 40 41 seq_printf(seq, "time: %-16llu\n", ktime_get_real_seconds()); 42 seq_printf(seq, "\t\t\t%-16s %-16s %-16s\n", 43 "io_bytes", "count", "avg_bytes"); 44 45 /* print app write IOs */ 46 seq_puts(seq, "[WRITE]\n"); 47 IOSTAT_INFO_SHOW("app buffered data", APP_BUFFERED_IO); 48 IOSTAT_INFO_SHOW("app direct data", APP_DIRECT_IO); 49 IOSTAT_INFO_SHOW("app mapped data", APP_MAPPED_IO); 50 IOSTAT_INFO_SHOW("app buffered cdata", APP_BUFFERED_CDATA_IO); 51 IOSTAT_INFO_SHOW("app mapped cdata", APP_MAPPED_CDATA_IO); 52 53 /* print fs write IOs */ 54 IOSTAT_INFO_SHOW("fs data", FS_DATA_IO); 55 IOSTAT_INFO_SHOW("fs cdata", FS_CDATA_IO); 56 IOSTAT_INFO_SHOW("fs node", FS_NODE_IO); 57 IOSTAT_INFO_SHOW("fs meta", FS_META_IO); 58 IOSTAT_INFO_SHOW("fs gc data", FS_GC_DATA_IO); 59 IOSTAT_INFO_SHOW("fs gc node", FS_GC_NODE_IO); 60 IOSTAT_INFO_SHOW("fs cp data", FS_CP_DATA_IO); 61 IOSTAT_INFO_SHOW("fs cp node", FS_CP_NODE_IO); 62 IOSTAT_INFO_SHOW("fs cp meta", FS_CP_META_IO); 63 64 /* print app read IOs */ 65 seq_puts(seq, "[READ]\n"); 66 IOSTAT_INFO_SHOW("app buffered data", APP_BUFFERED_READ_IO); 67 IOSTAT_INFO_SHOW("app direct data", APP_DIRECT_READ_IO); 68 IOSTAT_INFO_SHOW("app mapped data", APP_MAPPED_READ_IO); 69 IOSTAT_INFO_SHOW("app buffered cdata", APP_BUFFERED_CDATA_READ_IO); 70 IOSTAT_INFO_SHOW("app mapped cdata", APP_MAPPED_CDATA_READ_IO); 71 72 /* print fs read IOs */ 73 IOSTAT_INFO_SHOW("fs data", FS_DATA_READ_IO); 74 IOSTAT_INFO_SHOW("fs gc data", FS_GDATA_READ_IO); 75 IOSTAT_INFO_SHOW("fs cdata", FS_CDATA_READ_IO); 76 IOSTAT_INFO_SHOW("fs node", FS_NODE_READ_IO); 77 IOSTAT_INFO_SHOW("fs meta", FS_META_READ_IO); 78 79 /* print other IOs */ 80 seq_puts(seq, "[OTHER]\n"); 81 IOSTAT_INFO_SHOW("fs discard", FS_DISCARD_IO); 82 IOSTAT_INFO_SHOW("fs flush", FS_FLUSH_IO); 83 IOSTAT_INFO_SHOW("fs zone reset", FS_ZONE_RESET_IO); 84 85 return 0; 86} 87 88static inline void __record_iostat_latency(struct f2fs_sb_info *sbi) 89{ 90 int io, idx; 91 struct f2fs_iostat_latency iostat_lat[MAX_IO_TYPE][NR_PAGE_TYPE]; 92 struct iostat_lat_info *io_lat = sbi->iostat_io_lat; 93 unsigned long flags; 94 95 spin_lock_irqsave(&sbi->iostat_lat_lock, flags); 96 for (idx = 0; idx < MAX_IO_TYPE; idx++) { 97 for (io = 0; io < NR_PAGE_TYPE; io++) { 98 iostat_lat[idx][io].peak_lat = 99 jiffies_to_msecs(io_lat->peak_lat[idx][io]); 100 iostat_lat[idx][io].cnt = io_lat->bio_cnt[idx][io]; 101 iostat_lat[idx][io].avg_lat = iostat_lat[idx][io].cnt ? 102 jiffies_to_msecs(io_lat->sum_lat[idx][io]) / iostat_lat[idx][io].cnt : 0; 103 io_lat->sum_lat[idx][io] = 0; 104 io_lat->peak_lat[idx][io] = 0; 105 io_lat->bio_cnt[idx][io] = 0; 106 } 107 } 108 spin_unlock_irqrestore(&sbi->iostat_lat_lock, flags); 109 110 trace_f2fs_iostat_latency(sbi, iostat_lat); 111} 112 113static inline void f2fs_record_iostat(struct f2fs_sb_info *sbi) 114{ 115 unsigned long long iostat_diff[NR_IO_TYPE]; 116 int i; 117 unsigned long flags; 118 119 if (time_is_after_jiffies(sbi->iostat_next_period)) 120 return; 121 122 /* Need double check under the lock */ 123 spin_lock_irqsave(&sbi->iostat_lock, flags); 124 if (time_is_after_jiffies(sbi->iostat_next_period)) { 125 spin_unlock_irqrestore(&sbi->iostat_lock, flags); 126 return; 127 } 128 sbi->iostat_next_period = jiffies + 129 msecs_to_jiffies(sbi->iostat_period_ms); 130 131 for (i = 0; i < NR_IO_TYPE; i++) { 132 iostat_diff[i] = sbi->iostat_bytes[i] - 133 sbi->prev_iostat_bytes[i]; 134 sbi->prev_iostat_bytes[i] = sbi->iostat_bytes[i]; 135 } 136 spin_unlock_irqrestore(&sbi->iostat_lock, flags); 137 138 trace_f2fs_iostat(sbi, iostat_diff); 139 140 __record_iostat_latency(sbi); 141} 142 143void f2fs_reset_iostat(struct f2fs_sb_info *sbi) 144{ 145 struct iostat_lat_info *io_lat = sbi->iostat_io_lat; 146 int i; 147 148 spin_lock_irq(&sbi->iostat_lock); 149 for (i = 0; i < NR_IO_TYPE; i++) { 150 sbi->iostat_count[i] = 0; 151 sbi->iostat_bytes[i] = 0; 152 sbi->prev_iostat_bytes[i] = 0; 153 } 154 spin_unlock_irq(&sbi->iostat_lock); 155 156 spin_lock_irq(&sbi->iostat_lat_lock); 157 memset(io_lat, 0, sizeof(struct iostat_lat_info)); 158 spin_unlock_irq(&sbi->iostat_lat_lock); 159} 160 161static inline void __f2fs_update_iostat(struct f2fs_sb_info *sbi, 162 enum iostat_type type, unsigned long long io_bytes) 163{ 164 sbi->iostat_bytes[type] += io_bytes; 165 sbi->iostat_count[type]++; 166} 167 168void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode, 169 enum iostat_type type, unsigned long long io_bytes) 170{ 171 unsigned long flags; 172 173 if (!sbi->iostat_enable) 174 return; 175 176 spin_lock_irqsave(&sbi->iostat_lock, flags); 177 __f2fs_update_iostat(sbi, type, io_bytes); 178 179 if (type == APP_BUFFERED_IO || type == APP_DIRECT_IO) 180 __f2fs_update_iostat(sbi, APP_WRITE_IO, io_bytes); 181 182 if (type == APP_BUFFERED_READ_IO || type == APP_DIRECT_READ_IO) 183 __f2fs_update_iostat(sbi, APP_READ_IO, io_bytes); 184 185#ifdef CONFIG_F2FS_FS_COMPRESSION 186 if (inode && f2fs_compressed_file(inode)) { 187 if (type == APP_BUFFERED_IO) 188 __f2fs_update_iostat(sbi, APP_BUFFERED_CDATA_IO, io_bytes); 189 190 if (type == APP_BUFFERED_READ_IO) 191 __f2fs_update_iostat(sbi, APP_BUFFERED_CDATA_READ_IO, io_bytes); 192 193 if (type == APP_MAPPED_READ_IO) 194 __f2fs_update_iostat(sbi, APP_MAPPED_CDATA_READ_IO, io_bytes); 195 196 if (type == APP_MAPPED_IO) 197 __f2fs_update_iostat(sbi, APP_MAPPED_CDATA_IO, io_bytes); 198 199 if (type == FS_DATA_READ_IO) 200 __f2fs_update_iostat(sbi, FS_CDATA_READ_IO, io_bytes); 201 202 if (type == FS_DATA_IO) 203 __f2fs_update_iostat(sbi, FS_CDATA_IO, io_bytes); 204 } 205#endif 206 207 spin_unlock_irqrestore(&sbi->iostat_lock, flags); 208 209 f2fs_record_iostat(sbi); 210} 211 212static inline void __update_iostat_latency(struct bio_iostat_ctx *iostat_ctx, 213 enum iostat_lat_type lat_type) 214{ 215 unsigned long ts_diff; 216 unsigned int page_type = iostat_ctx->type; 217 struct f2fs_sb_info *sbi = iostat_ctx->sbi; 218 struct iostat_lat_info *io_lat = sbi->iostat_io_lat; 219 unsigned long flags; 220 221 if (!sbi->iostat_enable) 222 return; 223 224 ts_diff = jiffies - iostat_ctx->submit_ts; 225 if (page_type == META_FLUSH) { 226 page_type = META; 227 } else if (page_type >= NR_PAGE_TYPE) { 228 f2fs_warn(sbi, "%s: %d over NR_PAGE_TYPE", __func__, page_type); 229 return; 230 } 231 232 spin_lock_irqsave(&sbi->iostat_lat_lock, flags); 233 io_lat->sum_lat[lat_type][page_type] += ts_diff; 234 io_lat->bio_cnt[lat_type][page_type]++; 235 if (ts_diff > io_lat->peak_lat[lat_type][page_type]) 236 io_lat->peak_lat[lat_type][page_type] = ts_diff; 237 spin_unlock_irqrestore(&sbi->iostat_lat_lock, flags); 238} 239 240void iostat_update_and_unbind_ctx(struct bio *bio) 241{ 242 struct bio_iostat_ctx *iostat_ctx = bio->bi_private; 243 enum iostat_lat_type lat_type; 244 245 if (op_is_write(bio_op(bio))) { 246 lat_type = bio->bi_opf & REQ_SYNC ? 247 WRITE_SYNC_IO : WRITE_ASYNC_IO; 248 bio->bi_private = iostat_ctx->sbi; 249 } else { 250 lat_type = READ_IO; 251 bio->bi_private = iostat_ctx->post_read_ctx; 252 } 253 254 __update_iostat_latency(iostat_ctx, lat_type); 255 mempool_free(iostat_ctx, bio_iostat_ctx_pool); 256} 257 258void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi, 259 struct bio *bio, struct bio_post_read_ctx *ctx) 260{ 261 struct bio_iostat_ctx *iostat_ctx; 262 /* Due to the mempool, this never fails. */ 263 iostat_ctx = mempool_alloc(bio_iostat_ctx_pool, GFP_NOFS); 264 iostat_ctx->sbi = sbi; 265 iostat_ctx->submit_ts = 0; 266 iostat_ctx->type = 0; 267 iostat_ctx->post_read_ctx = ctx; 268 bio->bi_private = iostat_ctx; 269} 270 271int __init f2fs_init_iostat_processing(void) 272{ 273 bio_iostat_ctx_cache = 274 kmem_cache_create("f2fs_bio_iostat_ctx", 275 sizeof(struct bio_iostat_ctx), 0, 0, NULL); 276 if (!bio_iostat_ctx_cache) 277 goto fail; 278 bio_iostat_ctx_pool = 279 mempool_create_slab_pool(NUM_PREALLOC_IOSTAT_CTXS, 280 bio_iostat_ctx_cache); 281 if (!bio_iostat_ctx_pool) 282 goto fail_free_cache; 283 return 0; 284 285fail_free_cache: 286 kmem_cache_destroy(bio_iostat_ctx_cache); 287fail: 288 return -ENOMEM; 289} 290 291void f2fs_destroy_iostat_processing(void) 292{ 293 mempool_destroy(bio_iostat_ctx_pool); 294 kmem_cache_destroy(bio_iostat_ctx_cache); 295} 296 297int f2fs_init_iostat(struct f2fs_sb_info *sbi) 298{ 299 /* init iostat info */ 300 spin_lock_init(&sbi->iostat_lock); 301 spin_lock_init(&sbi->iostat_lat_lock); 302 sbi->iostat_enable = false; 303 sbi->iostat_period_ms = DEFAULT_IOSTAT_PERIOD_MS; 304 sbi->iostat_io_lat = f2fs_kzalloc(sbi, sizeof(struct iostat_lat_info), 305 GFP_KERNEL); 306 if (!sbi->iostat_io_lat) 307 return -ENOMEM; 308 309 return 0; 310} 311 312void f2fs_destroy_iostat(struct f2fs_sb_info *sbi) 313{ 314 kfree(sbi->iostat_io_lat); 315} 316