#include "super-io.h"
#include <trace/events/bcachefs.h>
+#include <linux/bsearch.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/math64.h>
a = bch2_alloc_to_v4(k, &_a);
*gen = a->gen;
- ret = (a->data_type == BCH_DATA_btree ||
- a->data_type == BCH_DATA_user) &&
+ ret = data_type_movable(a->data_type) &&
a->fragmentation_lru &&
a->fragmentation_lru <= time;
return ret;
}
-static int bch2_copygc_next_bucket(struct btree_trans *trans,
- struct bpos *bucket, u8 *gen, struct bpos *pos)
+typedef FIFO(struct move_bucket_in_flight) move_buckets_in_flight;
+
+struct move_bucket {
+ struct bpos bucket;
+ u8 gen;
+};
+
+typedef DARRAY(struct move_bucket) move_buckets;
+
+static int move_bucket_cmp(const void *_l, const void *_r)
+{
+ const struct move_bucket *l = _l;
+ const struct move_bucket *r = _r;
+
+ return bpos_cmp(l->bucket, r->bucket) ?: cmp_int(l->gen, r->gen);
+}
+
+static bool bucket_in_flight(move_buckets *buckets_sorted, struct move_bucket b)
+{
+ return bsearch(&b,
+ buckets_sorted->data,
+ buckets_sorted->nr,
+ sizeof(buckets_sorted->data[0]),
+ move_bucket_cmp) != NULL;
+}
+
+static void move_buckets_wait(struct btree_trans *trans,
+ struct moving_context *ctxt,
+ move_buckets_in_flight *buckets_in_flight,
+ size_t nr, bool verify_evacuated)
+{
+ while (!fifo_empty(buckets_in_flight)) {
+ struct move_bucket_in_flight *i = &fifo_peek_front(buckets_in_flight);
+
+ if (fifo_used(buckets_in_flight) > nr)
+ move_ctxt_wait_event(ctxt, trans, !atomic_read(&i->count));
+
+ if (atomic_read(&i->count))
+ break;
+
+ /*
+ * moving_ctxt_exit calls bch2_write as it flushes pending
+ * reads, which inits another btree_trans; this one must be
+ * unlocked:
+ */
+ if (verify_evacuated)
+ bch2_verify_bucket_evacuated(trans, i->bucket, i->gen);
+ buckets_in_flight->front++;
+ }
+
+ bch2_trans_unlock(trans);
+}
+
+static int bch2_copygc_get_buckets(struct btree_trans *trans,
+ struct moving_context *ctxt,
+ move_buckets_in_flight *buckets_in_flight,
+ move_buckets *buckets)
{
struct btree_iter iter;
+ move_buckets buckets_sorted = { 0 };
+ struct move_bucket_in_flight *i;
struct bkey_s_c k;
+ size_t fifo_iter, nr_to_get;
int ret;
+ move_buckets_wait(trans, ctxt, buckets_in_flight, buckets_in_flight->size / 2, true);
+
+ nr_to_get = max(16UL, fifo_used(buckets_in_flight) / 4);
+
+ fifo_for_each_entry_ptr(i, buckets_in_flight, fifo_iter) {
+ ret = darray_push(&buckets_sorted, ((struct move_bucket) {i->bucket, i->gen}));
+ if (ret) {
+ bch_err(trans->c, "error allocating move_buckets_sorted");
+ goto err;
+ }
+ }
+
+ sort(buckets_sorted.data,
+ buckets_sorted.nr,
+ sizeof(buckets_sorted.data[0]),
+ move_bucket_cmp,
+ NULL);
+
ret = for_each_btree_key2_upto(trans, iter, BTREE_ID_lru,
- bpos_max(*pos, lru_pos(BCH_LRU_FRAGMENTATION_START, 0, 0)),
+ lru_pos(BCH_LRU_FRAGMENTATION_START, 0, 0),
lru_pos(BCH_LRU_FRAGMENTATION_START, U64_MAX, LRU_TIME_MAX),
0, k, ({
- *bucket = u64_to_bucket(k.k->p.offset);
+ struct move_bucket b = { .bucket = u64_to_bucket(k.k->p.offset) };
+ int ret = 0;
- bch2_bucket_is_movable(trans, *bucket, lru_pos_time(k.k->p), gen);
+ 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 >= nr_to_get;
+
+ ret;
}));
+err:
+ darray_exit(&buckets_sorted);
- *pos = iter.pos;
- if (ret < 0)
- return ret;
- return ret ? 0 : -ENOENT;
+ return ret < 0 ? ret : 0;
}
-static int bch2_copygc(struct bch_fs *c)
+static int bch2_copygc(struct btree_trans *trans,
+ struct moving_context *ctxt,
+ move_buckets_in_flight *buckets_in_flight)
{
+ struct bch_fs *c = trans->c;
struct bch_move_stats move_stats;
- struct btree_trans trans;
- struct moving_context ctxt;
struct data_update_opts data_opts = {
.btree_insert_flags = BTREE_INSERT_USE_RESERVE|JOURNAL_WATERMARK_copygc,
};
- struct bpos bucket;
- struct bpos pos;
- u8 gen = 0;
- unsigned nr_evacuated;
+ move_buckets buckets = { 0 };
+ struct move_bucket_in_flight *f;
+ struct move_bucket *i;
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;
+
bch2_move_stats_init(&move_stats, "copygc");
- bch2_moving_ctxt_init(&ctxt, c, NULL, &move_stats,
- writepoint_ptr(&c->copygc_write_point),
- false);
- bch2_trans_init(&trans, c, 0, 0);
+ ctxt->stats = &move_stats;
- ret = bch2_btree_write_buffer_flush(&trans);
- BUG_ON(ret);
+ ret = bch2_copygc_get_buckets(trans, ctxt, buckets_in_flight, &buckets);
+ if (ret)
+ goto err;
- for (nr_evacuated = 0, pos = POS_MIN;
- nr_evacuated < 32 && !ret;
- nr_evacuated++, pos = bpos_nosnap_successor(pos)) {
- ret = bch2_copygc_next_bucket(&trans, &bucket, &gen, &pos) ?:
- __bch2_evacuate_bucket(&trans, &ctxt, bucket, gen, data_opts);
- if (bkey_eq(pos, POS_MAX))
+ darray_for_each(buckets, i) {
+ if (unlikely(freezing(current)))
break;
- }
- bch2_trans_exit(&trans);
- bch2_moving_ctxt_exit(&ctxt);
+ f = fifo_push_ref(buckets_in_flight);
+ f->bucket = i->bucket;
+ f->gen = i->gen;
+ atomic_set(&f->count, 0);
+
+ ret = __bch2_evacuate_bucket(trans, ctxt, f, f->bucket, f->gen, data_opts);
+ if (ret)
+ goto err;
+ }
+err:
+ darray_exit(&buckets);
/* no entries in LRU btree found, or got to end: */
if (ret == -ENOENT)
bch_err(c, "error from bch2_move_data() in copygc: %s", bch2_err_str(ret));
trace_and_count(c, copygc, c, atomic64_read(&move_stats.sectors_moved), 0, 0, 0);
+ ctxt->stats = NULL;
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_none) *
+ fragmented_allowed = ((__dev_buckets_available(ca, usage, RESERVE_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));
}
return wait;
}
+void bch2_copygc_wait_to_text(struct printbuf *out, struct bch_fs *c)
+{
+ prt_printf(out, "Currently waiting for: ");
+ prt_human_readable_u64(out, max(0LL, c->copygc_wait -
+ atomic64_read(&c->io_clock[WRITE].now)) << 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 io_clock *clock = &c->io_clock[WRITE];
+ move_buckets_in_flight move_buckets;
u64 last, wait;
int ret = 0;
+ if (!init_fifo(&move_buckets, 1 << 14, GFP_KERNEL)) {
+ bch_err(c, "error allocating copygc buckets in flight");
+ return -ENOMEM;
+ }
+
set_freezable();
+ bch2_trans_init(&trans, c, 0, 0);
+ bch2_moving_ctxt_init(&ctxt, c, NULL, NULL,
+ writepoint_ptr(&c->copygc_write_point),
+ false);
while (!ret && !kthread_should_stop()) {
+ bch2_trans_unlock(&trans);
cond_resched();
- if (kthread_wait_freezable(c->copy_gc_enabled))
- break;
+ if (!c->copy_gc_enabled) {
+ move_buckets_wait(&trans, &ctxt, &move_buckets, 0, true);
+ kthread_wait_freezable(c->copy_gc_enabled);
+ }
+
+ if (unlikely(freezing(current))) {
+ move_buckets_wait(&trans, &ctxt, &move_buckets, 0, true);
+ __refrigerator(false);
+ continue;
+ }
last = atomic64_read(&clock->now);
wait = bch2_copygc_wait_amount(c);
if (wait > clock->max_slop) {
+ move_buckets_wait(&trans, &ctxt, &move_buckets, 0, true);
trace_and_count(c, copygc_wait, c, wait, last + wait);
c->copygc_wait = last + wait;
bch2_kthread_io_clock_wait(clock, last + wait,
c->copygc_wait = 0;
c->copygc_running = true;
- ret = bch2_copygc(c);
+ ret = bch2_copygc(&trans, &ctxt, &move_buckets);
c->copygc_running = false;
wake_up(&c->copygc_running_wq);
}
+ bch2_moving_ctxt_exit(&ctxt);
+ bch2_trans_exit(&trans);
+ free_fifo(&move_buckets);
+
return 0;
}
projects / bcachefs-tools-debian / blobdiff