#include "btree_write_buffer.h"
#include "buckets.h"
#include "clock.h"
-#include "disk_groups.h"
#include "errcode.h"
#include "error.h"
-#include "extents.h"
-#include "eytzinger.h"
-#include "io.h"
-#include "keylist.h"
#include "lru.h"
#include "move.h"
#include "movinggc.h"
-#include "super-io.h"
+#include "trace.h"
-#include <trace/events/bcachefs.h>
-#include <linux/bsearch.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/math64.h>
#include <linux/sched/task.h>
-#include <linux/sort.h>
#include <linux/wait.h>
+struct buckets_in_flight {
+ struct rhashtable table;
+ struct move_bucket_in_flight *first;
+ struct move_bucket_in_flight *last;
+ size_t nr;
+ size_t sectors;
+};
+
+static const struct rhashtable_params bch_move_bucket_params = {
+ .head_offset = offsetof(struct move_bucket_in_flight, hash),
+ .key_offset = offsetof(struct move_bucket_in_flight, bucket.k),
+ .key_len = sizeof(struct move_bucket_key),
+};
+
+static struct move_bucket_in_flight *
+move_bucket_in_flight_add(struct buckets_in_flight *list, struct move_bucket b)
+{
+ struct move_bucket_in_flight *new = kzalloc(sizeof(*new), GFP_KERNEL);
+ int ret;
+
+ if (!new)
+ return ERR_PTR(-ENOMEM);
+
+ new->bucket = b;
+
+ ret = rhashtable_lookup_insert_fast(&list->table, &new->hash,
+ bch_move_bucket_params);
+ if (ret) {
+ kfree(new);
+ return ERR_PTR(ret);
+ }
+
+ if (!list->first)
+ list->first = new;
+ else
+ list->last->next = new;
+
+ list->last = new;
+ list->nr++;
+ list->sectors += b.sectors;
+ return new;
+}
+
static int bch2_bucket_is_movable(struct btree_trans *trans,
- struct bpos bucket, u64 time, u8 *gen)
+ struct move_bucket *b, u64 time)
{
struct btree_iter iter;
struct bkey_s_c k;
const struct bch_alloc_v4 *a;
int ret;
- if (bch2_bucket_is_open(trans->c, bucket.inode, bucket.offset))
+ if (bch2_bucket_is_open(trans->c,
+ b->k.bucket.inode,
+ b->k.bucket.offset))
return 0;
- bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc, bucket, 0);
- k = bch2_btree_iter_peek_slot(&iter);
+ k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_alloc,
+ b->k.bucket, BTREE_ITER_CACHED);
ret = bkey_err(k);
- bch2_trans_iter_exit(trans, &iter);
-
if (ret)
return ret;
a = bch2_alloc_to_v4(k, &_a);
- *gen = a->gen;
- ret = (a->data_type == BCH_DATA_btree ||
- a->data_type == BCH_DATA_user) &&
+ b->k.gen = a->gen;
+ b->sectors = a->dirty_sectors;
+
+ ret = data_type_movable(a->data_type) &&
a->fragmentation_lru &&
a->fragmentation_lru <= time;
- if (ret) {
- struct printbuf buf = PRINTBUF;
-
- bch2_bkey_val_to_text(&buf, trans->c, k);
- pr_debug("%s", buf.buf);
- printbuf_exit(&buf);
- }
-
+ bch2_trans_iter_exit(trans, &iter);
return ret;
}
-struct copygc_bucket_in_flight {
- struct bpos bucket;
- u8 gen;
- struct moving_context ctxt;
-};
+static void move_buckets_wait(struct moving_context *ctxt,
+ struct buckets_in_flight *list,
+ bool flush)
+{
+ struct move_bucket_in_flight *i;
+ int ret;
-typedef FIFO(struct copygc_bucket_in_flight) copygc_buckets_in_flight;
+ while ((i = list->first)) {
+ if (flush)
+ move_ctxt_wait_event(ctxt, !atomic_read(&i->count));
-struct copygc_bucket {
- struct bpos bucket;
- u8 gen;
-};
+ if (atomic_read(&i->count))
+ break;
-typedef DARRAY(struct copygc_bucket) copygc_buckets;
+ list->first = i->next;
+ if (!list->first)
+ list->last = NULL;
-static int copygc_bucket_cmp(const void *_l, const void *_r)
-{
- const struct copygc_bucket *l = _l;
- const struct copygc_bucket *r = _r;
+ list->nr--;
+ list->sectors -= i->bucket.sectors;
- return bpos_cmp(l->bucket, r->bucket) ?: cmp_int(l->gen, r->gen);
-}
+ ret = rhashtable_remove_fast(&list->table, &i->hash,
+ bch_move_bucket_params);
+ BUG_ON(ret);
+ kfree(i);
+ }
-static bool bucket_in_flight(copygc_buckets *buckets_sorted, struct copygc_bucket b)
-{
- return bsearch(&b,
- buckets_sorted->data,
- buckets_sorted->nr,
- sizeof(buckets_sorted->data[0]),
- copygc_bucket_cmp) != NULL;
+ bch2_trans_unlock(ctxt->trans);
}
-static void copygc_buckets_wait(struct btree_trans *trans,
- copygc_buckets_in_flight *buckets_in_flight,
- size_t nr, bool verify_evacuated)
+static bool bucket_in_flight(struct buckets_in_flight *list,
+ struct move_bucket_key k)
{
- while (!fifo_empty(buckets_in_flight)) {
- struct copygc_bucket_in_flight *i = &fifo_peek_front(buckets_in_flight);
-
- if (fifo_used(buckets_in_flight) <= nr &&
- closure_nr_remaining(&i->ctxt.cl) != 1)
- break;
-
- /*
- * moving_ctxt_exit calls bch2_write as it flushes pending
- * reads, which inits another btree_trans; this one must be
- * unlocked:
- */
- bch2_trans_unlock(trans);
- bch2_moving_ctxt_exit(&i->ctxt);
- if (verify_evacuated)
- bch2_verify_bucket_evacuated(trans, i->bucket, i->gen);
- buckets_in_flight->front++;
- }
+ return rhashtable_lookup_fast(&list->table, &k, bch_move_bucket_params);
}
-static int bch2_copygc_get_buckets(struct btree_trans *trans,
- copygc_buckets_in_flight *buckets_in_flight,
- copygc_buckets *buckets)
+typedef DARRAY(struct move_bucket) move_buckets;
+
+static int bch2_copygc_get_buckets(struct moving_context *ctxt,
+ struct buckets_in_flight *buckets_in_flight,
+ move_buckets *buckets)
{
+ struct btree_trans *trans = ctxt->trans;
+ struct bch_fs *c = trans->c;
struct btree_iter iter;
- copygc_buckets buckets_sorted = { 0 };
- struct copygc_bucket_in_flight *i;
struct bkey_s_c k;
- size_t fifo_iter;
+ size_t nr_to_get = max_t(size_t, 16U, buckets_in_flight->nr / 4);
+ size_t saw = 0, in_flight = 0, not_movable = 0, sectors = 0;
int ret;
- copygc_buckets_wait(trans, buckets_in_flight, buckets_in_flight->size / 2, true);
+ move_buckets_wait(ctxt, buckets_in_flight, false);
- fifo_for_each_entry_ptr(i, buckets_in_flight, fifo_iter) {
- ret = darray_push(&buckets_sorted, ((struct copygc_bucket) {i->bucket, i->gen}));
- if (ret) {
- bch_err(trans->c, "error allocating copygc_buckets_sorted");
- goto err;
- }
- }
-
- sort(buckets_sorted.data,
- buckets_sorted.nr,
- sizeof(buckets_sorted.data[0]),
- copygc_bucket_cmp,
- NULL);
+ ret = bch2_btree_write_buffer_flush(trans);
+ if (bch2_fs_fatal_err_on(ret, c, "%s: error %s from bch2_btree_write_buffer_flush()",
+ __func__, bch2_err_str(ret)))
+ return ret;
ret = for_each_btree_key2_upto(trans, iter, BTREE_ID_lru,
lru_pos(BCH_LRU_FRAGMENTATION_START, 0, 0),
lru_pos(BCH_LRU_FRAGMENTATION_START, U64_MAX, LRU_TIME_MAX),
0, k, ({
- struct copygc_bucket b = { .bucket = u64_to_bucket(k.k->p.offset) };
- int ret = 0;
-
- if (!bucket_in_flight(&buckets_sorted, b) &&
- bch2_bucket_is_movable(trans, b.bucket, lru_pos_time(k.k->p), &b.gen))
- ret = darray_push(buckets, b) ?: buckets->nr >= fifo_free(buckets_in_flight);
-
- ret;
+ struct move_bucket b = { .k.bucket = u64_to_bucket(k.k->p.offset) };
+ int ret2 = 0;
+
+ saw++;
+
+ if (!bch2_bucket_is_movable(trans, &b, lru_pos_time(k.k->p)))
+ not_movable++;
+ else if (bucket_in_flight(buckets_in_flight, b.k))
+ in_flight++;
+ else {
+ ret2 = darray_push(buckets, b) ?: buckets->nr >= nr_to_get;
+ if (ret2 >= 0)
+ sectors += b.sectors;
+ }
+ ret2;
}));
-err:
- darray_exit(&buckets_sorted);
+
+ pr_debug("have: %zu (%zu) saw %zu in flight %zu not movable %zu got %zu (%zu)/%zu buckets ret %i",
+ buckets_in_flight->nr, buckets_in_flight->sectors,
+ saw, in_flight, not_movable, buckets->nr, sectors, nr_to_get, ret);
return ret < 0 ? ret : 0;
}
-static int bch2_copygc(struct btree_trans *trans,
- copygc_buckets_in_flight *buckets_in_flight,
- struct bch_move_stats *stats)
+noinline
+static int bch2_copygc(struct moving_context *ctxt,
+ struct buckets_in_flight *buckets_in_flight)
{
+ struct btree_trans *trans = ctxt->trans;
struct bch_fs *c = trans->c;
struct data_update_opts data_opts = {
- .btree_insert_flags = BTREE_INSERT_USE_RESERVE|JOURNAL_WATERMARK_copygc,
+ .btree_insert_flags = BCH_WATERMARK_copygc,
};
- copygc_buckets buckets = { 0 };
- struct copygc_bucket_in_flight *f;
- struct copygc_bucket *i;
+ move_buckets buckets = { 0 };
+ struct move_bucket_in_flight *f;
+ struct move_bucket *i;
+ u64 moved = atomic64_read(&ctxt->stats->sectors_moved);
int ret = 0;
- ret = bch2_btree_write_buffer_flush(trans);
- if (bch2_fs_fatal_err_on(ret, c, "%s: error %s from bch2_btree_write_buffer_flush()",
- __func__, bch2_err_str(ret)))
- return ret;
-
- ret = bch2_copygc_get_buckets(trans, buckets_in_flight, &buckets);
+ ret = bch2_copygc_get_buckets(ctxt, buckets_in_flight, &buckets);
if (ret)
goto err;
if (unlikely(freezing(current)))
break;
- f = fifo_push_ref(buckets_in_flight);
- f->bucket = i->bucket;
- f->gen = i->gen;
- bch2_moving_ctxt_init(&f->ctxt, c, NULL, NULL, //stats,
- writepoint_ptr(&c->copygc_write_point),
- false);
+ f = move_bucket_in_flight_add(buckets_in_flight, *i);
+ ret = PTR_ERR_OR_ZERO(f);
+ if (ret == -EEXIST) { /* rare race: copygc_get_buckets returned same bucket more than once */
+ ret = 0;
+ continue;
+ }
+ if (ret == -ENOMEM) { /* flush IO, continue later */
+ ret = 0;
+ break;
+ }
- ret = __bch2_evacuate_bucket(trans, &f->ctxt, f->bucket, f->gen, data_opts);
+ ret = __bch2_evacuate_bucket(ctxt, f, f->bucket.k.bucket,
+ f->bucket.k.gen, data_opts);
if (ret)
goto err;
}
darray_exit(&buckets);
/* no entries in LRU btree found, or got to end: */
- if (ret == -ENOENT)
+ if (bch2_err_matches(ret, ENOENT))
ret = 0;
if (ret < 0 && !bch2_err_matches(ret, EROFS))
- bch_err(c, "error from bch2_move_data() in copygc: %s", bch2_err_str(ret));
+ bch_err_msg(c, ret, "from bch2_move_data()");
- trace_and_count(c, copygc, c, atomic64_read(&stats->sectors_moved), 0, 0, 0);
+ moved = atomic64_read(&ctxt->stats->sectors_moved) - moved;
+ trace_and_count(c, copygc, c, moved, 0, 0, 0);
return ret;
}
struct bch_dev *ca;
unsigned dev_idx;
s64 wait = S64_MAX, fragmented_allowed, fragmented;
+ unsigned i;
for_each_rw_member(ca, c, dev_idx) {
struct bch_dev_usage usage = bch2_dev_usage_read(ca);
- fragmented_allowed = ((__dev_buckets_available(ca, usage, RESERVE_stripe) *
+ fragmented_allowed = ((__dev_buckets_available(ca, usage, BCH_WATERMARK_stripe) *
ca->mi.bucket_size) >> 1);
- fragmented = usage.d[BCH_DATA_user].fragmented;
+ fragmented = 0;
+
+ for (i = 0; i < BCH_DATA_NR; i++)
+ if (data_type_movable(i))
+ fragmented += usage.d[i].fragmented;
wait = min(wait, max(0LL, fragmented_allowed - fragmented));
}
atomic64_read(&c->io_clock[WRITE].now)) << 9);
prt_newline(out);
+ prt_printf(out, "Currently waiting since: ");
+ prt_human_readable_u64(out, max(0LL,
+ atomic64_read(&c->io_clock[WRITE].now) -
+ c->copygc_wait_at) << 9);
+ prt_newline(out);
+
prt_printf(out, "Currently calculated wait: ");
prt_human_readable_u64(out, bch2_copygc_wait_amount(c));
prt_newline(out);
static int bch2_copygc_thread(void *arg)
{
struct bch_fs *c = arg;
- struct btree_trans trans;
+ struct moving_context ctxt;
struct bch_move_stats move_stats;
struct io_clock *clock = &c->io_clock[WRITE];
- copygc_buckets_in_flight copygc_buckets;
+ struct buckets_in_flight buckets;
u64 last, wait;
int ret = 0;
- if (!init_fifo(©gc_buckets, 1 << 14, GFP_KERNEL)) {
- bch_err(c, "error allocating copygc buckets in flight");
- return -ENOMEM;
+ memset(&buckets, 0, sizeof(buckets));
+
+ ret = rhashtable_init(&buckets.table, &bch_move_bucket_params);
+ if (ret) {
+ bch_err_msg(c, ret, "allocating copygc buckets in flight");
+ return ret;
}
set_freezable();
+
bch2_move_stats_init(&move_stats, "copygc");
- bch2_trans_init(&trans, c, 0, 0);
+ bch2_moving_ctxt_init(&ctxt, c, NULL, &move_stats,
+ writepoint_ptr(&c->copygc_write_point),
+ false);
while (!ret && !kthread_should_stop()) {
- bch2_trans_unlock(&trans);
-
- try_to_freeze();
+ bch2_trans_unlock(ctxt.trans);
cond_resched();
- kthread_wait(freezing(current) || c->copy_gc_enabled);
+ if (!c->copy_gc_enabled) {
+ move_buckets_wait(&ctxt, &buckets, true);
+ kthread_wait_freezable(c->copy_gc_enabled);
+ }
if (unlikely(freezing(current))) {
- copygc_buckets_wait(&trans, ©gc_buckets, 0, true);
- bch2_trans_unlock(&trans);
+ move_buckets_wait(&ctxt, &buckets, true);
__refrigerator(false);
continue;
}
wait = bch2_copygc_wait_amount(c);
if (wait > clock->max_slop) {
- trace_and_count(c, copygc_wait, c, wait, last + wait);
+ c->copygc_wait_at = last;
c->copygc_wait = last + wait;
+ move_buckets_wait(&ctxt, &buckets, true);
+ trace_and_count(c, copygc_wait, c, wait, last + wait);
bch2_kthread_io_clock_wait(clock, last + wait,
MAX_SCHEDULE_TIMEOUT);
continue;
c->copygc_wait = 0;
c->copygc_running = true;
- ret = bch2_copygc(&trans, ©gc_buckets, &move_stats);
+ ret = bch2_copygc(&ctxt, &buckets);
c->copygc_running = false;
wake_up(&c->copygc_running_wq);
}
- copygc_buckets_wait(&trans, ©gc_buckets, 0, !ret);
- free_fifo(©gc_buckets);
- bch2_trans_exit(&trans);
+ move_buckets_wait(&ctxt, &buckets, true);
+ rhashtable_destroy(&buckets.table);
+ bch2_moving_ctxt_exit(&ctxt);
+ bch2_move_stats_exit(&move_stats, c);
return 0;
}
t = kthread_create(bch2_copygc_thread, c, "bch-copygc/%s", c->name);
ret = PTR_ERR_OR_ZERO(t);
if (ret) {
- bch_err(c, "error creating copygc thread: %s", bch2_err_str(ret));
+ bch_err_msg(c, ret, "creating copygc thread");
return ret;
}
projects / bcachefs-tools-debian / blobdiff