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bcachefs: don't call bch2_bucket_seq_cleanup from journal_buf_switch

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journal_buf_switch is called from the foreground when getting a journal
reservation and thus is somewhat latency sensitive;
bch2_bucket_seq_cleanup has to run infrequently but is a bit expensive
when it does run.

Call it from the journal write path instead, and punt the journal write
to worqueue context.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2018-07-21 22:57:20 -04:00 committed by Kent Overstreet
parent 8bb4dff72d
commit c692399529
5 changed files with 17 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
fs/bcachefs/bcachefs.h
View file

@ -719,7 +719,7 @@ struct bch_fs {
struct journal journal;
unsigned bucket_journal_seq;
u64 last_bucket_seq_cleanup;
/* The rest of this all shows up in sysfs */
atomic_long_t read_realloc_races;

7
fs/bcachefs/buckets.c
View file

@ -147,6 +147,7 @@ static void bch2_disk_reservations_verify(struct bch_fs *c, int flags) {}
*/
void bch2_bucket_seq_cleanup(struct bch_fs *c)
{
u64 journal_seq = atomic64_read(&c->journal.seq);
u16 last_seq_ondisk = c->journal.last_seq_ondisk;
struct bch_dev *ca;
struct bucket_array *buckets;
@ -154,6 +155,12 @@ void bch2_bucket_seq_cleanup(struct bch_fs *c)
struct bucket_mark m;
unsigned i;
if (journal_seq - c->last_bucket_seq_cleanup <
(1U << (BUCKET_JOURNAL_SEQ_BITS - 2)))
return;
c->last_bucket_seq_cleanup = journal_seq;
for_each_member_device(ca, c, i) {
down_read(&ca->bucket_lock);
buckets = bucket_array(ca);

2
fs/bcachefs/buckets_types.h
View file

@ -4,6 +4,8 @@
#include "util.h"
#define BUCKET_JOURNAL_SEQ_BITS 16
struct bucket_mark {
union {
struct {

20
fs/bcachefs/journal.c
View file

@ -32,14 +32,8 @@ void bch2_journal_buf_put_slowpath(struct journal *j, bool need_write_just_set)
test_bit(JOURNAL_NEED_WRITE, &j->flags))
bch2_time_stats_update(j->delay_time,
j->need_write_time);
#if 0
closure_call(&j->io, bch2_journal_write, NULL, NULL);
#else
/* Shut sparse up: */
closure_init(&j->io, NULL);
set_closure_fn(&j->io, bch2_journal_write, NULL);
bch2_journal_write(&j->io);
#endif
closure_call(&j->io, bch2_journal_write, system_highpri_wq, NULL);
}
static void journal_pin_new_entry(struct journal *j, int count)
@ -172,13 +166,6 @@ static enum {
cancel_delayed_work(&j->write_work);
spin_unlock(&j->lock);
if (c->bucket_journal_seq > 1 << 14) {
c->bucket_journal_seq = 0;
bch2_bucket_seq_cleanup(c);
}
c->bucket_journal_seq++;
/* ugh - might be called from __journal_res_get() under wait_event() */
__set_current_state(TASK_RUNNING);
bch2_journal_buf_put(j, old.idx, need_write_just_set);
@ -943,6 +930,7 @@ void bch2_fs_journal_stop(struct journal *j)
void bch2_fs_journal_start(struct journal *j)
{
struct bch_fs *c = container_of(j, struct bch_fs, journal);
struct journal_seq_blacklist *bl;
u64 blacklist = 0;
@ -964,6 +952,8 @@ void bch2_fs_journal_start(struct journal *j)
journal_pin_new_entry(j, 1);
bch2_journal_buf_init(j);
c->last_bucket_seq_cleanup = journal_cur_seq(j);
spin_unlock(&j->lock);
/*

2
fs/bcachefs/journal_io.c
View file

@ -1384,6 +1384,8 @@ void bch2_journal_write(struct closure *cl)
extent_for_each_ptr(bkey_i_to_s_extent(&j->key), ptr)
ptr->offset += sectors;
bch2_bucket_seq_cleanup(c);
continue_at(cl, journal_write_done, system_highpri_wq);
return;
err: