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bcachefs: Ensure btree node cache is not more than half dirty

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Tweak journal reclaim to ensure the btree node cache isn't more
than half dirty so that memory reclaim can always make progress - the
same as we do for the btree key cache.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2021-11-11 15:50:22 -05:00 committed by Kent Overstreet
parent c782c5832e
commit 637de729fc
1 changed files with 3 additions and 0 deletions
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3
fs/bcachefs/journal_reclaim.c
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@ -640,6 +640,9 @@ static int __bch2_journal_reclaim(struct journal *j, bool direct, bool kicked)
if (fifo_free(&j->pin) <= 32)
min_nr = 1;
if (atomic_read(&c->btree_cache.dirty) * 2 > c->btree_cache.used)
min_nr = 1;
min_key_cache = min(bch2_nr_btree_keys_need_flush(c), (size_t) 128);
trace_and_count(c, journal_reclaim_start, c,