ldiskfs/kernel_patches/patches/linux-5.9/ext4-simple-blockalloc.patch

   1 ---
   2  fs/ext4/ext4.h    |    7 ++
   3  fs/ext4/mballoc.c |  133 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
   4  fs/ext4/mballoc.h |    3 +
   5  fs/ext4/sysfs.c   |   52 +++++++++++++++++++++
   6  4 files changed, 195 insertions(+)
   7
   8 --- a/fs/ext4/ext4.h
   9 +++ b/fs/ext4/ext4.h
  10 @@ -1536,6 +1536,9 @@ struct ext4_sb_info {
  11         unsigned int s_mb_min_to_scan;
  12         unsigned int s_mb_stats;
  13         unsigned int s_mb_order2_reqs;
  14 +       ext4_fsblk_t s_mb_c1_blocks;
  15 +       ext4_fsblk_t s_mb_c2_blocks;
  16 +       ext4_fsblk_t s_mb_c3_blocks;
  17         unsigned long *s_mb_prealloc_table;
  18         unsigned int s_mb_group_prealloc;
  19         unsigned int s_mb_max_inode_prealloc;
  20 @@ -1555,6 +1558,9 @@ struct ext4_sb_info {
  21         atomic_t s_bal_goals;   /* goal hits */
  22         atomic_t s_bal_breaks;  /* too long searches */
  23         atomic_t s_bal_2orders; /* 2^order hits */
  24 +       /* cX loop didn't find blocks */
  25 +       atomic64_t s_bal_cX_failed[3];
  26 +       atomic64_t s_bal_cX_skipped[3];
  27         spinlock_t s_bal_lock;
  28         unsigned long s_mb_buddies_generated;
  29         unsigned long long s_mb_generation_time;
  30 @@ -2846,6 +2852,7 @@ ext4_read_inode_bitmap(struct super_bloc
  31  /* mballoc.c */
  32  extern const struct proc_ops ext4_seq_prealloc_table_fops;
  33  extern const struct seq_operations ext4_mb_seq_groups_ops;
  34 +extern const struct proc_ops ext4_mb_seq_alloc_fops;
  35  extern const struct proc_ops ext4_seq_mb_last_group_fops;
  36  extern int ext4_mb_seq_last_start_seq_show(struct seq_file *m, void *v);
  37  extern long ext4_mb_stats;
  38 --- a/fs/ext4/mballoc.c
  39 +++ b/fs/ext4/mballoc.c
  40 @@ -2308,6 +2308,20 @@ void ext4_mb_prefetch_fini(struct super_
  41         }
  42  }
  43
  44 +static u64 available_blocks_count(struct ext4_sb_info *sbi)
  45 +{
  46 +       ext4_fsblk_t resv_blocks;
  47 +       u64 bfree;
  48 +       struct ext4_super_block *es = sbi->s_es;
  49 +
  50 +       resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
  51 +       bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
  52 +                percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
  53 +
  54 +       bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
  55 +       return bfree - (ext4_r_blocks_count(es) + resv_blocks);
  56 +}
  57 +
  58  static noinline_for_stack int
  59  ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
  60  {
  61 @@ -2318,6 +2332,7 @@ ext4_mb_regular_allocator(struct ext4_al
  62         struct ext4_sb_info *sbi;
  63         struct super_block *sb;
  64         struct ext4_buddy e4b;
  65 +       ext4_fsblk_t avail_blocks;
  66         int lost;
  67
  68         sb = ac->ac_sb;
  69 @@ -2371,6 +2386,21 @@ ext4_mb_regular_allocator(struct ext4_al
  70
  71         /* Let's just scan groups to find more-less suitable blocks */
  72         cr = ac->ac_2order ? 0 : 1;
  73 +
  74 +       /* Choose what loop to pass based on disk fullness */
  75 +       avail_blocks = available_blocks_count(sbi) ;
  76 +
  77 +       if (avail_blocks < sbi->s_mb_c3_blocks) {
  78 +               cr = 3;
  79 +               atomic64_inc(&sbi->s_bal_cX_skipped[2]);
  80 +       } else if(avail_blocks < sbi->s_mb_c2_blocks) {
  81 +               cr = 2;
  82 +               atomic64_inc(&sbi->s_bal_cX_skipped[1]);
  83 +       } else if(avail_blocks < sbi->s_mb_c1_blocks) {
  84 +               cr = 1;
  85 +               atomic64_inc(&sbi->s_bal_cX_skipped[0]);
  86 +       }
  87 +
  88         /*
  89          * cr == 0 try to get exact allocation,
  90          * cr == 3  try to get anything
  91 @@ -2458,6 +2488,9 @@ repeat:
  92                         if (ac->ac_status != AC_STATUS_CONTINUE)
  93                                 break;
  94                 }
  95 +               /* Processed all groups and haven't found blocks */
  96 +               if (i == ngroups)
  97 +                       atomic64_inc(&sbi->s_bal_cX_failed[cr]);
  98         }
  99
 100         if (ac->ac_b_ex.fe_len > 0 && ac->ac_status != AC_STATUS_FOUND &&
 101 @@ -2746,6 +2779,92 @@ const struct proc_ops ext4_seq_mb_last_g
 102         .proc_write     = ext4_mb_last_group_write,
 103  };
 104
 105 +static int mb_seq_alloc_show(struct seq_file *seq, void *v)
 106 +{
 107 +       struct super_block *sb = seq->private;
 108 +       struct ext4_sb_info *sbi = EXT4_SB(sb);
 109 +
 110 +       seq_printf(seq, "mballoc:\n");
 111 +       seq_printf(seq, "\tblocks: %u\n", atomic_read(&sbi->s_bal_allocated));
 112 +       seq_printf(seq, "\treqs: %u\n", atomic_read(&sbi->s_bal_reqs));
 113 +       seq_printf(seq, "\tsuccess: %u\n", atomic_read(&sbi->s_bal_success));
 114 +
 115 +       seq_printf(seq, "\textents_scanned: %u\n",
 116 +                  atomic_read(&sbi->s_bal_ex_scanned));
 117 +       seq_printf(seq, "\t\tgoal_hits: %u\n", atomic_read(&sbi->s_bal_goals));
 118 +       seq_printf(seq, "\t\t2^n_hits: %u\n", atomic_read(&sbi->s_bal_2orders));
 119 +       seq_printf(seq, "\t\tbreaks: %u\n", atomic_read(&sbi->s_bal_breaks));
 120 +       seq_printf(seq, "\t\tlost: %u\n", atomic_read(&sbi->s_mb_lost_chunks));
 121 +
 122 +       seq_printf(seq, "\tuseless_c1_loops: %llu\n",
 123 +                  atomic64_read(&sbi->s_bal_cX_failed[0]));
 124 +       seq_printf(seq, "\tuseless_c2_loops: %llu\n",
 125 +                  atomic64_read(&sbi->s_bal_cX_failed[1]));
 126 +       seq_printf(seq, "\tuseless_c3_loops: %llu\n",
 127 +                  atomic64_read(&sbi->s_bal_cX_failed[2]));
 128 +       seq_printf(seq, "\tskipped_c1_loops: %llu\n",
 129 +                  atomic64_read(&sbi->s_bal_cX_skipped[0]));
 130 +       seq_printf(seq, "\tskipped_c2_loops: %llu\n",
 131 +                  atomic64_read(&sbi->s_bal_cX_skipped[1]));
 132 +       seq_printf(seq, "\tskipped_c3_loops: %llu\n",
 133 +                  atomic64_read(&sbi->s_bal_cX_skipped[2]));
 134 +       seq_printf(seq, "\tbuddies_generated: %lu\n",
 135 +                  sbi->s_mb_buddies_generated);
 136 +       seq_printf(seq, "\tbuddies_time_used: %llu\n", sbi->s_mb_generation_time);
 137 +       seq_printf(seq, "\tpreallocated: %u\n",
 138 +                  atomic_read(&sbi->s_mb_preallocated));
 139 +       seq_printf(seq, "\tdiscarded: %u\n",
 140 +                  atomic_read(&sbi->s_mb_discarded));
 141 +       return 0;
 142 +}
 143 +
 144 +static ssize_t mb_seq_alloc_write(struct file *file,
 145 +                             const char __user *buf,
 146 +                             size_t cnt, loff_t *pos)
 147 +{
 148 +       struct ext4_sb_info *sbi = EXT4_SB(PDE_DATA(file_inode(file)));
 149 +
 150 +       atomic_set(&sbi->s_bal_allocated, 0),
 151 +       atomic_set(&sbi->s_bal_reqs, 0),
 152 +       atomic_set(&sbi->s_bal_success, 0);
 153 +
 154 +       atomic_set(&sbi->s_bal_ex_scanned, 0),
 155 +       atomic_set(&sbi->s_bal_goals, 0),
 156 +       atomic_set(&sbi->s_bal_2orders, 0),
 157 +       atomic_set(&sbi->s_bal_breaks, 0),
 158 +       atomic_set(&sbi->s_mb_lost_chunks, 0);
 159 +
 160 +       atomic64_set(&sbi->s_bal_cX_failed[0], 0),
 161 +       atomic64_set(&sbi->s_bal_cX_failed[1], 0),
 162 +       atomic64_set(&sbi->s_bal_cX_failed[2], 0);
 163 +
 164 +       atomic64_set(&sbi->s_bal_cX_skipped[0], 0),
 165 +       atomic64_set(&sbi->s_bal_cX_skipped[1], 0),
 166 +       atomic64_set(&sbi->s_bal_cX_skipped[2], 0);
 167 +
 168 +
 169 +       sbi->s_mb_buddies_generated = 0;
 170 +       sbi->s_mb_generation_time = 0;
 171 +
 172 +       atomic_set(&sbi->s_mb_preallocated, 0),
 173 +       atomic_set(&sbi->s_mb_discarded, 0);
 174 +
 175 +       return cnt;
 176 +}
 177 +
 178 +static int mb_seq_alloc_open(struct inode *inode, struct file *file)
 179 +{
 180 +       return single_open(file, mb_seq_alloc_show, PDE_DATA(inode));
 181 +}
 182 +
 183 +const struct proc_ops ext4_mb_seq_alloc_fops = {
 184 +       .proc_open      = mb_seq_alloc_open,
 185 +       .proc_read      = seq_read,
 186 +       .proc_lseek     = seq_lseek,
 187 +       .proc_release   = single_release,
 188 +       .proc_write     = mb_seq_alloc_write,
 189 +};
 190 +
 191  int ext4_mb_seq_last_start_seq_show(struct seq_file *m, void *v)
 192  {
 193         struct ext4_sb_info *sbi = EXT4_SB(m->private);
 194 @@ -2992,6 +3111,7 @@ static int ext4_groupinfo_create_slab(si
 195         return 0;
 196  }
 197
 198 +#define THRESHOLD_BLOCKS(ts) (ext4_blocks_count(sbi->s_es) / 100 * ts)
 199  int ext4_mb_init(struct super_block *sb)
 200  {
 201         struct ext4_sb_info *sbi = EXT4_SB(sb);
 202 @@ -3046,6 +3166,9 @@ int ext4_mb_init(struct super_block *sb)
 203         sbi->s_mb_stats = MB_DEFAULT_STATS;
 204         sbi->s_mb_order2_reqs = MB_DEFAULT_ORDER2_REQS;
 205         sbi->s_mb_max_inode_prealloc = MB_DEFAULT_MAX_INODE_PREALLOC;
 206 +       sbi->s_mb_c1_blocks = THRESHOLD_BLOCKS(MB_DEFAULT_C1_THRESHOLD);
 207 +       sbi->s_mb_c2_blocks = THRESHOLD_BLOCKS(MB_DEFAULT_C2_THRESHOLD);
 208 +       sbi->s_mb_c3_blocks = THRESHOLD_BLOCKS(MB_DEFAULT_C3_THRESHOLD);
 209         /*
 210          * The default group preallocation is 512, which for 4k block
 211          * sizes translates to 2 megabytes.  However for bigalloc file
 212 @@ -3185,6 +3308,16 @@ int ext4_mb_release(struct super_block *
 213                                 atomic_read(&sbi->s_bal_reqs),
 214                                 atomic_read(&sbi->s_bal_success));
 215                 ext4_msg(sb, KERN_INFO,
 216 +                       "mballoc: (%llu, %llu, %llu) useless c(0,1,2) loops",
 217 +                               atomic64_read(&sbi->s_bal_cX_failed[0]),
 218 +                               atomic64_read(&sbi->s_bal_cX_failed[1]),
 219 +                               atomic64_read(&sbi->s_bal_cX_failed[2]));
 220 +               ext4_msg(sb, KERN_INFO,
 221 +                       "mballoc: (%llu, %llu, %llu) skipped c(0,1,2) loops",
 222 +                               atomic64_read(&sbi->s_bal_cX_skipped[0]),
 223 +                               atomic64_read(&sbi->s_bal_cX_skipped[1]),
 224 +                               atomic64_read(&sbi->s_bal_cX_skipped[2]));
 225 +               ext4_msg(sb, KERN_INFO,
 226                       "mballoc: %u extents scanned, %u goal hits, "
 227                                 "%u 2^N hits, %u breaks, %u lost",
 228                                 atomic_read(&sbi->s_bal_ex_scanned),
 229 --- a/fs/ext4/mballoc.h
 230 +++ b/fs/ext4/mballoc.h
 231 @@ -68,6 +68,9 @@
 232   * for which requests use 2^N search using buddies
 233   */
 234  #define MB_DEFAULT_ORDER2_REQS         8
 235 +#define MB_DEFAULT_C1_THRESHOLD                25
 236 +#define MB_DEFAULT_C2_THRESHOLD                15
 237 +#define MB_DEFAULT_C3_THRESHOLD                5
 238
 239  /*
 240   * default group prealloc size 512 blocks
 241 --- a/fs/ext4/sysfs.c
 242 +++ b/fs/ext4/sysfs.c
 243 @@ -21,6 +21,9 @@
 244  typedef enum {
 245         attr_noop,
 246         attr_delayed_allocation_blocks,
 247 +       attr_mb_c1_threshold,
 248 +       attr_mb_c2_threshold,
 249 +       attr_mb_c3_threshold,
 250         attr_session_write_kbytes,
 251         attr_lifetime_write_kbytes,
 252         attr_reserved_clusters,
 253 @@ -140,6 +143,32 @@ static ssize_t journal_task_show(struct
 254                         task_pid_vnr(sbi->s_journal->j_task));
 255  }
 256
 257 +#define THRESHOLD_PERCENT(ts) (ts * 100 / ext4_blocks_count(sbi->s_es))
 258 +
 259 +static int save_threshold_percent(struct ext4_sb_info *sbi, const char *buf,
 260 +                                 ext4_fsblk_t *blocks)
 261 +{
 262 +       unsigned long long val;
 263 +
 264 +       int ret;
 265 +
 266 +       ret = kstrtoull(skip_spaces(buf), 0, &val);
 267 +       if (ret || val > 100)
 268 +               return -EINVAL;
 269 +
 270 +       *blocks = val * ext4_blocks_count(sbi->s_es) / 100;
 271 +       return 0;
 272 +}
 273 +
 274 +static ssize_t mb_threshold_store(struct ext4_sb_info *sbi,
 275 +                                 const char *buf, size_t count,
 276 +                                 ext4_fsblk_t *blocks)
 277 +{
 278 +       int ret = save_threshold_percent(sbi, buf, blocks);
 279 +
 280 +       return ret ?: count;
 281 +}
 282 +
 283  #define EXT4_ATTR(_name,_mode,_id)                                     \
 284  static struct ext4_attr ext4_attr_##_name = {                          \
 285         .attr = {.name = __stringify(_name), .mode = _mode },           \
 286 @@ -208,6 +237,9 @@ EXT4_ATTR_FUNC(delayed_allocation_blocks
 287  EXT4_ATTR_FUNC(session_write_kbytes, 0444);
 288  EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
 289  EXT4_ATTR_FUNC(reserved_clusters, 0644);
 290 +EXT4_ATTR_FUNC(mb_c1_threshold, 0644);
 291 +EXT4_ATTR_FUNC(mb_c2_threshold, 0644);
 292 +EXT4_ATTR_FUNC(mb_c3_threshold, 0644);
 293
 294  EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
 295                  ext4_sb_info, s_inode_readahead_blks);
 296 @@ -261,6 +293,9 @@ static struct attribute *ext4_attrs[] =
 297         ATTR_LIST(session_write_kbytes),
 298         ATTR_LIST(lifetime_write_kbytes),
 299         ATTR_LIST(reserved_clusters),
 300 +       ATTR_LIST(mb_c1_threshold),
 301 +       ATTR_LIST(mb_c2_threshold),
 302 +       ATTR_LIST(mb_c3_threshold),
 303         ATTR_LIST(inode_readahead_blks),
 304         ATTR_LIST(inode_goal),
 305         ATTR_LIST(max_dir_size),
 306 @@ -378,6 +413,15 @@ static ssize_t ext4_attr_show(struct kob
 307                 return snprintf(buf, PAGE_SIZE, "%llu\n",
 308                                 (s64) EXT4_C2B(sbi,
 309                        percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
 310 +       case attr_mb_c1_threshold:
 311 +               return scnprintf(buf, PAGE_SIZE, "%llu\n",
 312 +                                THRESHOLD_PERCENT(sbi->s_mb_c1_blocks));
 313 +       case attr_mb_c2_threshold:
 314 +               return scnprintf(buf, PAGE_SIZE, "%llu\n",
 315 +                                THRESHOLD_PERCENT(sbi->s_mb_c2_blocks));
 316 +       case attr_mb_c3_threshold:
 317 +               return scnprintf(buf, PAGE_SIZE, "%llu\n",
 318 +                                THRESHOLD_PERCENT(sbi->s_mb_c3_blocks));
 319         case attr_session_write_kbytes:
 320                 return session_write_kbytes_show(sbi, buf);
 321         case attr_lifetime_write_kbytes:
 322 @@ -479,6 +523,12 @@ static ssize_t ext4_attr_store(struct ko
 323                 return inode_readahead_blks_store(sbi, buf, len);
 324         case attr_trigger_test_error:
 325                 return trigger_test_error(sbi, buf, len);
 326 +       case attr_mb_c1_threshold:
 327 +               return mb_threshold_store(sbi, buf, len, &sbi->s_mb_c1_blocks);
 328 +       case attr_mb_c2_threshold:
 329 +               return mb_threshold_store(sbi, buf, len, &sbi->s_mb_c2_blocks);
 330 +       case attr_mb_c3_threshold:
 331 +               return mb_threshold_store(sbi, buf, len, &sbi->s_mb_c3_blocks);
 332         }
 333         return 0;
 334  }
 335 @@ -541,6 +591,8 @@ int ext4_register_sysfs(struct super_blo
 336                                 &ext4_seq_mb_last_group_fops, sb);
 337                 proc_create_single_data("mb_last_start", S_IRUGO, sbi->s_proc,
 338                                 ext4_mb_seq_last_start_seq_show, sb);
 339 +               proc_create_data("mb_alloc_stats", S_IFREG | S_IRUGO | S_IWUSR,
 340 +                                sbi->s_proc, &ext4_mb_seq_alloc_fops, sb);
 341         }
 342         return 0;
 343  }