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bcachefs: Fix btree key cache dirty checks

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Had a type that meant we were triggering journal reclaim _much_ more
aggressively than needed. Also, fix a potential integer overflow.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-12-05 21:03:57 -05:00 committed by Kent Overstreet
parent 5d32c5bb07
commit f51e84fe24
2 changed files with 4 additions and 3 deletions
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6
fs/bcachefs/btree_key_cache.h
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@ -4,8 +4,8 @@
static inline size_t bch2_nr_btree_keys_need_flush(struct bch_fs *c)
{
size_t nr_dirty = READ_ONCE(c->btree_key_cache.nr_dirty);
size_t nr_keys = READ_ONCE(c->btree_key_cache.nr_dirty);
size_t max_dirty = 4096 + nr_keys / 2;
size_t nr_keys = READ_ONCE(c->btree_key_cache.nr_keys);
size_t max_dirty = 1024 + nr_keys / 2;
return max_t(ssize_t, 0, nr_dirty - max_dirty);
}
@ -13,7 +13,7 @@ static inline size_t bch2_nr_btree_keys_need_flush(struct bch_fs *c)
static inline bool bch2_btree_key_cache_must_wait(struct bch_fs *c)
{
size_t nr_dirty = READ_ONCE(c->btree_key_cache.nr_dirty);
size_t nr_keys = READ_ONCE(c->btree_key_cache.nr_dirty);
size_t nr_keys = READ_ONCE(c->btree_key_cache.nr_keys);
size_t max_dirty = 4096 + (nr_keys * 3) / 4;
return nr_dirty > max_dirty;

1
fs/bcachefs/journal_reclaim.c
View file

@ -240,6 +240,7 @@ void bch2_journal_space_available(struct journal *j)
u64s_remaining -= (u64) total << 3;
u64s_remaining = max(0LL, u64s_remaining);
u64s_remaining /= 2;
u64s_remaining = min_t(u64, u64s_remaining, U32_MAX);
out:
j->cur_entry_sectors = !ret ? j->space[journal_space_discarded].next_entry : 0;
j->cur_entry_error = ret;