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Diffstat (limited to 'fs/bcachefs/journal_reclaim.c')
-rw-r--r--fs/bcachefs/journal_reclaim.c120
1 files changed, 79 insertions, 41 deletions
diff --git a/fs/bcachefs/journal_reclaim.c b/fs/bcachefs/journal_reclaim.c
index ec712104addb..820d25e19e5f 100644
--- a/fs/bcachefs/journal_reclaim.c
+++ b/fs/bcachefs/journal_reclaim.c
@@ -3,6 +3,7 @@
#include "bcachefs.h"
#include "btree_key_cache.h"
#include "btree_update.h"
+#include "btree_write_buffer.h"
#include "buckets.h"
#include "errcode.h"
#include "error.h"
@@ -50,17 +51,24 @@ unsigned bch2_journal_dev_buckets_available(struct journal *j,
return available;
}
-static inline void journal_set_watermark(struct journal *j, bool low_on_space)
+void bch2_journal_set_watermark(struct journal *j)
{
- unsigned watermark = BCH_WATERMARK_stripe;
-
- if (low_on_space)
- watermark = max_t(unsigned, watermark, BCH_WATERMARK_reclaim);
- if (fifo_free(&j->pin) < j->pin.size / 4)
- watermark = max_t(unsigned, watermark, BCH_WATERMARK_reclaim);
-
- if (watermark == j->watermark)
- return;
+ struct bch_fs *c = container_of(j, struct bch_fs, journal);
+ bool low_on_space = j->space[journal_space_clean].total * 4 <=
+ j->space[journal_space_total].total;
+ bool low_on_pin = fifo_free(&j->pin) < j->pin.size / 4;
+ bool low_on_wb = bch2_btree_write_buffer_must_wait(c);
+ unsigned watermark = low_on_space || low_on_pin || low_on_wb
+ ? BCH_WATERMARK_reclaim
+ : BCH_WATERMARK_stripe;
+
+ if (track_event_change(&c->times[BCH_TIME_blocked_journal_low_on_space],
+ &j->low_on_space_start, low_on_space) ||
+ track_event_change(&c->times[BCH_TIME_blocked_journal_low_on_pin],
+ &j->low_on_pin_start, low_on_pin) ||
+ track_event_change(&c->times[BCH_TIME_blocked_write_buffer_full],
+ &j->write_buffer_full_start, low_on_wb))
+ trace_and_count(c, journal_full, c);
swap(watermark, j->watermark);
if (watermark > j->watermark)
@@ -128,15 +136,13 @@ static struct journal_space __journal_space_available(struct journal *j, unsigne
enum journal_space_from from)
{
struct bch_fs *c = container_of(j, struct bch_fs, journal);
- struct bch_dev *ca;
- unsigned i, pos, nr_devs = 0;
+ unsigned pos, nr_devs = 0;
struct journal_space space, dev_space[BCH_SB_MEMBERS_MAX];
BUG_ON(nr_devs_want > ARRAY_SIZE(dev_space));
rcu_read_lock();
- for_each_member_device_rcu(ca, c, i,
- &c->rw_devs[BCH_DATA_journal]) {
+ for_each_member_device_rcu(c, ca, &c->rw_devs[BCH_DATA_journal]) {
if (!ca->journal.nr)
continue;
@@ -165,19 +171,17 @@ static struct journal_space __journal_space_available(struct journal *j, unsigne
void bch2_journal_space_available(struct journal *j)
{
struct bch_fs *c = container_of(j, struct bch_fs, journal);
- struct bch_dev *ca;
unsigned clean, clean_ondisk, total;
unsigned max_entry_size = min(j->buf[0].buf_size >> 9,
j->buf[1].buf_size >> 9);
- unsigned i, nr_online = 0, nr_devs_want;
+ unsigned nr_online = 0, nr_devs_want;
bool can_discard = false;
int ret = 0;
lockdep_assert_held(&j->lock);
rcu_read_lock();
- for_each_member_device_rcu(ca, c, i,
- &c->rw_devs[BCH_DATA_journal]) {
+ for_each_member_device_rcu(c, ca, &c->rw_devs[BCH_DATA_journal]) {
struct journal_device *ja = &ca->journal;
if (!ja->nr)
@@ -208,7 +212,7 @@ void bch2_journal_space_available(struct journal *j)
nr_devs_want = min_t(unsigned, nr_online, c->opts.metadata_replicas);
- for (i = 0; i < journal_space_nr; i++)
+ for (unsigned i = 0; i < journal_space_nr; i++)
j->space[i] = __journal_space_available(j, nr_devs_want, i);
clean_ondisk = j->space[journal_space_clean_ondisk].total;
@@ -226,7 +230,7 @@ void bch2_journal_space_available(struct journal *j)
else
clear_bit(JOURNAL_MAY_SKIP_FLUSH, &j->flags);
- journal_set_watermark(j, clean * 4 <= total);
+ bch2_journal_set_watermark(j);
out:
j->cur_entry_sectors = !ret ? j->space[journal_space_discarded].next_entry : 0;
j->cur_entry_error = ret;
@@ -255,12 +259,10 @@ static bool should_discard_bucket(struct journal *j, struct journal_device *ja)
void bch2_journal_do_discards(struct journal *j)
{
struct bch_fs *c = container_of(j, struct bch_fs, journal);
- struct bch_dev *ca;
- unsigned iter;
mutex_lock(&j->discard_lock);
- for_each_rw_member(ca, c, iter) {
+ for_each_rw_member(c, ca) {
struct journal_device *ja = &ca->journal;
while (should_discard_bucket(j, ja)) {
@@ -299,6 +301,7 @@ void bch2_journal_reclaim_fast(struct journal *j)
* all btree nodes got written out
*/
while (!fifo_empty(&j->pin) &&
+ j->pin.front <= j->seq_ondisk &&
!atomic_read(&fifo_peek_front(&j->pin).count)) {
j->pin.front++;
popped = true;
@@ -367,15 +370,36 @@ static enum journal_pin_type journal_pin_type(journal_pin_flush_fn fn)
return JOURNAL_PIN_other;
}
-void bch2_journal_pin_set(struct journal *j, u64 seq,
+static inline void bch2_journal_pin_set_locked(struct journal *j, u64 seq,
struct journal_entry_pin *pin,
- journal_pin_flush_fn flush_fn)
+ journal_pin_flush_fn flush_fn,
+ enum journal_pin_type type)
+{
+ struct journal_entry_pin_list *pin_list = journal_seq_pin(j, seq);
+
+ /*
+ * flush_fn is how we identify journal pins in debugfs, so must always
+ * exist, even if it doesn't do anything:
+ */
+ BUG_ON(!flush_fn);
+
+ atomic_inc(&pin_list->count);
+ pin->seq = seq;
+ pin->flush = flush_fn;
+ list_add(&pin->list, &pin_list->list[type]);
+}
+
+void bch2_journal_pin_copy(struct journal *j,
+ struct journal_entry_pin *dst,
+ struct journal_entry_pin *src,
+ journal_pin_flush_fn flush_fn)
{
- struct journal_entry_pin_list *pin_list;
bool reclaim;
spin_lock(&j->lock);
+ u64 seq = READ_ONCE(src->seq);
+
if (seq < journal_last_seq(j)) {
/*
* bch2_journal_pin_copy() raced with bch2_journal_pin_drop() on
@@ -387,18 +411,34 @@ void bch2_journal_pin_set(struct journal *j, u64 seq,
return;
}
- pin_list = journal_seq_pin(j, seq);
+ reclaim = __journal_pin_drop(j, dst);
- reclaim = __journal_pin_drop(j, pin);
+ bch2_journal_pin_set_locked(j, seq, dst, flush_fn, journal_pin_type(flush_fn));
- atomic_inc(&pin_list->count);
- pin->seq = seq;
- pin->flush = flush_fn;
+ if (reclaim)
+ bch2_journal_reclaim_fast(j);
+ spin_unlock(&j->lock);
- if (flush_fn)
- list_add(&pin->list, &pin_list->list[journal_pin_type(flush_fn)]);
- else
- list_add(&pin->list, &pin_list->flushed);
+ /*
+ * If the journal is currently full, we might want to call flush_fn
+ * immediately:
+ */
+ journal_wake(j);
+}
+
+void bch2_journal_pin_set(struct journal *j, u64 seq,
+ struct journal_entry_pin *pin,
+ journal_pin_flush_fn flush_fn)
+{
+ bool reclaim;
+
+ spin_lock(&j->lock);
+
+ BUG_ON(seq < journal_last_seq(j));
+
+ reclaim = __journal_pin_drop(j, pin);
+
+ bch2_journal_pin_set_locked(j, seq, pin, flush_fn, journal_pin_type(flush_fn));
if (reclaim)
bch2_journal_reclaim_fast(j);
@@ -537,13 +577,11 @@ static size_t journal_flush_pins(struct journal *j,
static u64 journal_seq_to_flush(struct journal *j)
{
struct bch_fs *c = container_of(j, struct bch_fs, journal);
- struct bch_dev *ca;
u64 seq_to_flush = 0;
- unsigned iter;
spin_lock(&j->lock);
- for_each_rw_member(ca, c, iter) {
+ for_each_rw_member(c, ca) {
struct journal_device *ja = &ca->journal;
unsigned nr_buckets, bucket_to_flush;
@@ -747,10 +785,9 @@ int bch2_journal_reclaim_start(struct journal *j)
p = kthread_create(bch2_journal_reclaim_thread, j,
"bch-reclaim/%s", c->name);
ret = PTR_ERR_OR_ZERO(p);
- if (ret) {
- bch_err_msg(c, ret, "creating journal reclaim thread");
+ bch_err_msg(c, ret, "creating journal reclaim thread");
+ if (ret)
return ret;
- }
get_task_struct(p);
j->reclaim_thread = p;
@@ -796,6 +833,7 @@ static int journal_flush_done(struct journal *j, u64 seq_to_flush,
bool bch2_journal_flush_pins(struct journal *j, u64 seq_to_flush)
{
+ /* time_stats this */
bool did_work = false;
if (!test_bit(JOURNAL_STARTED, &j->flags))
generated by cgit (git 2.34.1) at 2024-06-23 18:35:24 +0000