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bcache: Fix a journalling performance bug

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This commit is contained in:
Kent Overstreet 2013-10-08 15:50:46 -07:00
parent 1fa8455deb
commit 7857d5d470
2 changed files with 28 additions and 22 deletions
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47
drivers/md/bcache/journal.c
View file

@ -554,32 +554,26 @@ static void journal_write_endio(struct bio *bio, int error)
struct journal_write *w = bio->bi_private;
cache_set_err_on(error, w->c, "journal io error");
closure_put(&w->c->journal.io.cl);
closure_put(&w->c->journal.io);
}
static void journal_write(struct closure *);
static void journal_write_done(struct closure *cl)
{
struct journal *j = container_of(cl, struct journal, io.cl);
struct cache_set *c = container_of(j, struct cache_set, journal);
struct journal *j = container_of(cl, struct journal, io);
struct journal_write *w = (j->cur == j->w)
? &j->w[1]
: &j->w[0];
__closure_wake_up(&w->wait);
if (c->journal_delay_ms)
closure_delay(&j->io, msecs_to_jiffies(c->journal_delay_ms));
continue_at(cl, journal_write, system_wq);
continue_at_nobarrier(cl, journal_write, system_wq);
}
static void journal_write_unlocked(struct closure *cl)
__releases(c->journal.lock)
{
struct cache_set *c = container_of(cl, struct cache_set, journal.io.cl);
struct cache_set *c = container_of(cl, struct cache_set, journal.io);
struct cache *ca;
struct journal_write *w = c->journal.cur;
struct bkey *k = &c->journal.key;
@ -660,7 +654,7 @@ static void journal_write_unlocked(struct closure *cl)
static void journal_write(struct closure *cl)
{
struct cache_set *c = container_of(cl, struct cache_set, journal.io.cl);
struct cache_set *c = container_of(cl, struct cache_set, journal.io);
spin_lock(&c->journal.lock);
journal_write_unlocked(cl);
@ -669,7 +663,10 @@ static void journal_write(struct closure *cl)
static void __journal_try_write(struct cache_set *c, bool noflush)
__releases(c->journal.lock)
{
struct closure *cl = &c->journal.io.cl;
struct closure *cl = &c->journal.io;
struct journal_write *w = c->journal.cur;
w->need_write = true;
if (!closure_trylock(cl, &c->cl))
spin_unlock(&c->journal.lock);
@ -688,18 +685,24 @@ void bch_journal_meta(struct cache_set *c, struct closure *cl)
if (CACHE_SYNC(&c->sb)) {
spin_lock(&c->journal.lock);
w = c->journal.cur;
w->need_write = true;
if (cl)
BUG_ON(!closure_wait(&w->wait, cl));
closure_flush(&c->journal.io);
__journal_try_write(c, true);
}
}
static void journal_write_work(struct work_struct *work)
{
struct cache_set *c = container_of(to_delayed_work(work),
struct cache_set,
journal.work);
spin_lock(&c->journal.lock);
journal_try_write(c);
}
/*
* Entry point to the journalling code - bio_insert() and btree_invalidate()
* pass bch_journal() a list of keys to be journalled, and then
@ -739,7 +742,6 @@ void bch_journal(struct closure *cl)
}
w = c->journal.cur;
w->need_write = true;
b = __set_blocks(w->data, w->data->keys + n, c);
if (b * c->sb.block_size > PAGE_SECTORS << JSET_BITS ||
@ -755,8 +757,6 @@ void bch_journal(struct closure *cl)
BUG_ON(!closure_wait(&w->wait, cl));
closure_flush(&c->journal.io);
journal_try_write(c);
continue_at(cl, bch_journal, bcache_wq);
}
@ -768,11 +768,15 @@ void bch_journal(struct closure *cl)
atomic_inc(op->journal);
if (op->flush_journal) {
closure_flush(&c->journal.io);
closure_wait(&w->wait, cl->parent);
journal_try_write(c);
} else if (!w->need_write) {
schedule_delayed_work(&c->journal.work,
msecs_to_jiffies(c->journal_delay_ms));
spin_unlock(&c->journal.lock);
} else {
spin_unlock(&c->journal.lock);
}
journal_try_write(c);
out:
bch_btree_insert_async(cl);
}
@ -790,6 +794,7 @@ int bch_journal_alloc(struct cache_set *c)
closure_init_unlocked(&j->io);
spin_lock_init(&j->lock);
INIT_DELAYED_WORK(&j->work, journal_write_work);
c->journal_delay_ms = 100;

3
drivers/md/bcache/journal.h
View file

@ -140,7 +140,8 @@ struct journal {
spinlock_t lock;
/* used when waiting because the journal was full */
struct closure_waitlist wait;
struct closure_with_timer io;
struct closure io;
struct delayed_work work;
/* Number of blocks free in the bucket(s) we're currently writing to */
unsigned blocks_free;