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 17 #define NUM_PREALLOC_IOSTAT_CTXS 128 18 static struct kmem_cache *bio_iostat_ctx_cache; 19 static mempool_t *bio_iostat_ctx_pool; 20 21 int __maybe_unused iostat_info_seq_show(struct seq_file *seq, void *offset) 22 { 23 struct super_block *sb = seq->private; 24 struct f2fs_sb_info *sbi = F2FS_SB(sb); 25 time64_t now = ktime_get_real_seconds(); 26 27 if (!sbi->iostat_enable) 28 return 0; 29 30 seq_printf(seq, "time: %-16llu\n", now); 31 32 /* print app write IOs */ 33 seq_puts(seq, "[WRITE]\n"); 34 seq_printf(seq, "app buffered: %-16llu\n", 35 sbi->rw_iostat[APP_BUFFERED_IO]); 36 seq_printf(seq, "app direct: %-16llu\n", 37 sbi->rw_iostat[APP_DIRECT_IO]); 38 seq_printf(seq, "app mapped: %-16llu\n", 39 sbi->rw_iostat[APP_MAPPED_IO]); 40 41 /* print fs write IOs */ 42 seq_printf(seq, "fs data: %-16llu\n", 43 sbi->rw_iostat[FS_DATA_IO]); 44 seq_printf(seq, "fs node: %-16llu\n", 45 sbi->rw_iostat[FS_NODE_IO]); 46 seq_printf(seq, "fs meta: %-16llu\n", 47 sbi->rw_iostat[FS_META_IO]); 48 seq_printf(seq, "fs gc data: %-16llu\n", 49 sbi->rw_iostat[FS_GC_DATA_IO]); 50 seq_printf(seq, "fs gc node: %-16llu\n", 51 sbi->rw_iostat[FS_GC_NODE_IO]); 52 seq_printf(seq, "fs cp data: %-16llu\n", 53 sbi->rw_iostat[FS_CP_DATA_IO]); 54 seq_printf(seq, "fs cp node: %-16llu\n", 55 sbi->rw_iostat[FS_CP_NODE_IO]); 56 seq_printf(seq, "fs cp meta: %-16llu\n", 57 sbi->rw_iostat[FS_CP_META_IO]); 58 59 /* print app read IOs */ 60 seq_puts(seq, "[READ]\n"); 61 seq_printf(seq, "app buffered: %-16llu\n", 62 sbi->rw_iostat[APP_BUFFERED_READ_IO]); 63 seq_printf(seq, "app direct: %-16llu\n", 64 sbi->rw_iostat[APP_DIRECT_READ_IO]); 65 seq_printf(seq, "app mapped: %-16llu\n", 66 sbi->rw_iostat[APP_MAPPED_READ_IO]); 67 68 /* print fs read IOs */ 69 seq_printf(seq, "fs data: %-16llu\n", 70 sbi->rw_iostat[FS_DATA_READ_IO]); 71 seq_printf(seq, "fs gc data: %-16llu\n", 72 sbi->rw_iostat[FS_GDATA_READ_IO]); 73 seq_printf(seq, "fs compr_data: %-16llu\n", 74 sbi->rw_iostat[FS_CDATA_READ_IO]); 75 seq_printf(seq, "fs node: %-16llu\n", 76 sbi->rw_iostat[FS_NODE_READ_IO]); 77 seq_printf(seq, "fs meta: %-16llu\n", 78 sbi->rw_iostat[FS_META_READ_IO]); 79 80 /* print other IOs */ 81 seq_puts(seq, "[OTHER]\n"); 82 seq_printf(seq, "fs discard: %-16llu\n", 83 sbi->rw_iostat[FS_DISCARD]); 84 85 return 0; 86 } 87 88 static inline void __record_iostat_latency(struct f2fs_sb_info *sbi) 89 { 90 int io, idx = 0; 91 unsigned int cnt; 92 struct f2fs_iostat_latency iostat_lat[MAX_IO_TYPE][NR_PAGE_TYPE]; 93 struct iostat_lat_info *io_lat = sbi->iostat_io_lat; 94 95 spin_lock_bh(&sbi->iostat_lat_lock); 96 for (idx = 0; idx < MAX_IO_TYPE; idx++) { 97 for (io = 0; io < NR_PAGE_TYPE; io++) { 98 cnt = io_lat->bio_cnt[idx][io]; 99 iostat_lat[idx][io].peak_lat = 100 jiffies_to_msecs(io_lat->peak_lat[idx][io]); 101 iostat_lat[idx][io].cnt = cnt; 102 iostat_lat[idx][io].avg_lat = cnt ? 103 jiffies_to_msecs(io_lat->sum_lat[idx][io]) / cnt : 0; 104 io_lat->sum_lat[idx][io] = 0; 105 io_lat->peak_lat[idx][io] = 0; 106 io_lat->bio_cnt[idx][io] = 0; 107 } 108 } 109 spin_unlock_bh(&sbi->iostat_lat_lock); 110 111 trace_f2fs_iostat_latency(sbi, iostat_lat); 112 } 113 114 static inline void f2fs_record_iostat(struct f2fs_sb_info *sbi) 115 { 116 unsigned long long iostat_diff[NR_IO_TYPE]; 117 int i; 118 119 if (time_is_after_jiffies(sbi->iostat_next_period)) 120 return; 121 122 /* Need double check under the lock */ 123 spin_lock_bh(&sbi->iostat_lock); 124 if (time_is_after_jiffies(sbi->iostat_next_period)) { 125 spin_unlock_bh(&sbi->iostat_lock); 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->rw_iostat[i] - 133 sbi->prev_rw_iostat[i]; 134 sbi->prev_rw_iostat[i] = sbi->rw_iostat[i]; 135 } 136 spin_unlock_bh(&sbi->iostat_lock); 137 138 trace_f2fs_iostat(sbi, iostat_diff); 139 140 __record_iostat_latency(sbi); 141 } 142 143 void 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_bh(&sbi->iostat_lock); 149 for (i = 0; i < NR_IO_TYPE; i++) { 150 sbi->rw_iostat[i] = 0; 151 sbi->prev_rw_iostat[i] = 0; 152 } 153 spin_unlock_bh(&sbi->iostat_lock); 154 155 spin_lock_bh(&sbi->iostat_lat_lock); 156 memset(io_lat, 0, sizeof(struct iostat_lat_info)); 157 spin_unlock_bh(&sbi->iostat_lat_lock); 158 } 159 160 void f2fs_update_iostat(struct f2fs_sb_info *sbi, 161 enum iostat_type type, unsigned long long io_bytes) 162 { 163 if (!sbi->iostat_enable) 164 return; 165 166 spin_lock_bh(&sbi->iostat_lock); 167 sbi->rw_iostat[type] += io_bytes; 168 169 if (type == APP_BUFFERED_IO || type == APP_DIRECT_IO) 170 sbi->rw_iostat[APP_WRITE_IO] += io_bytes; 171 172 if (type == APP_BUFFERED_READ_IO || type == APP_DIRECT_READ_IO) 173 sbi->rw_iostat[APP_READ_IO] += io_bytes; 174 175 spin_unlock_bh(&sbi->iostat_lock); 176 177 f2fs_record_iostat(sbi); 178 } 179 180 static inline void __update_iostat_latency(struct bio_iostat_ctx *iostat_ctx, 181 int rw, bool is_sync) 182 { 183 unsigned long ts_diff; 184 unsigned int iotype = iostat_ctx->type; 185 struct f2fs_sb_info *sbi = iostat_ctx->sbi; 186 struct iostat_lat_info *io_lat = sbi->iostat_io_lat; 187 int idx; 188 189 if (!sbi->iostat_enable) 190 return; 191 192 ts_diff = jiffies - iostat_ctx->submit_ts; 193 if (iotype >= META_FLUSH) 194 iotype = META; 195 196 if (rw == 0) { 197 idx = READ_IO; 198 } else { 199 if (is_sync) 200 idx = WRITE_SYNC_IO; 201 else 202 idx = WRITE_ASYNC_IO; 203 } 204 205 spin_lock_bh(&sbi->iostat_lat_lock); 206 io_lat->sum_lat[idx][iotype] += ts_diff; 207 io_lat->bio_cnt[idx][iotype]++; 208 if (ts_diff > io_lat->peak_lat[idx][iotype]) 209 io_lat->peak_lat[idx][iotype] = ts_diff; 210 spin_unlock_bh(&sbi->iostat_lat_lock); 211 } 212 213 void iostat_update_and_unbind_ctx(struct bio *bio, int rw) 214 { 215 struct bio_iostat_ctx *iostat_ctx = bio->bi_private; 216 bool is_sync = bio->bi_opf & REQ_SYNC; 217 218 if (rw == 0) 219 bio->bi_private = iostat_ctx->post_read_ctx; 220 else 221 bio->bi_private = iostat_ctx->sbi; 222 __update_iostat_latency(iostat_ctx, rw, is_sync); 223 mempool_free(iostat_ctx, bio_iostat_ctx_pool); 224 } 225 226 void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi, 227 struct bio *bio, struct bio_post_read_ctx *ctx) 228 { 229 struct bio_iostat_ctx *iostat_ctx; 230 /* Due to the mempool, this never fails. */ 231 iostat_ctx = mempool_alloc(bio_iostat_ctx_pool, GFP_NOFS); 232 iostat_ctx->sbi = sbi; 233 iostat_ctx->submit_ts = 0; 234 iostat_ctx->type = 0; 235 iostat_ctx->post_read_ctx = ctx; 236 bio->bi_private = iostat_ctx; 237 } 238 239 int __init f2fs_init_iostat_processing(void) 240 { 241 bio_iostat_ctx_cache = 242 kmem_cache_create("f2fs_bio_iostat_ctx", 243 sizeof(struct bio_iostat_ctx), 0, 0, NULL); 244 if (!bio_iostat_ctx_cache) 245 goto fail; 246 bio_iostat_ctx_pool = 247 mempool_create_slab_pool(NUM_PREALLOC_IOSTAT_CTXS, 248 bio_iostat_ctx_cache); 249 if (!bio_iostat_ctx_pool) 250 goto fail_free_cache; 251 return 0; 252 253 fail_free_cache: 254 kmem_cache_destroy(bio_iostat_ctx_cache); 255 fail: 256 return -ENOMEM; 257 } 258 259 void f2fs_destroy_iostat_processing(void) 260 { 261 mempool_destroy(bio_iostat_ctx_pool); 262 kmem_cache_destroy(bio_iostat_ctx_cache); 263 } 264 265 int f2fs_init_iostat(struct f2fs_sb_info *sbi) 266 { 267 /* init iostat info */ 268 spin_lock_init(&sbi->iostat_lock); 269 spin_lock_init(&sbi->iostat_lat_lock); 270 sbi->iostat_enable = false; 271 sbi->iostat_period_ms = DEFAULT_IOSTAT_PERIOD_MS; 272 sbi->iostat_io_lat = f2fs_kzalloc(sbi, sizeof(struct iostat_lat_info), 273 GFP_KERNEL); 274 if (!sbi->iostat_io_lat) 275 return -ENOMEM; 276 277 return 0; 278 } 279 280 void f2fs_destroy_iostat(struct f2fs_sb_info *sbi) 281 { 282 kfree(sbi->iostat_io_lat); 283 } 284