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author | Kent Overstreet <kent.overstreet@linux.dev> | 2022-11-26 00:04:42 +0300 |
---|---|---|
committer | Kent Overstreet <kent.overstreet@linux.dev> | 2023-10-23 00:09:47 +0300 |
commit | 447e92274af6c7e8dcdc7921a6af238afcc87a0a (patch) | |
tree | e990c5248f9c637f84fbf1866e4b59c348e21ef1 /fs/bcachefs | |
parent | b6804b6103263417994602482e9186fb3697a3e6 (diff) | |
download | linux-447e92274af6c7e8dcdc7921a6af238afcc87a0a.tar.xz |
bcachefs: Don't set accessed bit on btree node fill
Btree nodes shouldn't have their accessed bit set when entering the
btree cache by being read in from disk - this fixes linear scans
thrashing the cache.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs')
-rw-r--r-- | fs/bcachefs/btree_cache.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/bcachefs/btree_cache.c b/fs/bcachefs/btree_cache.c index 91ddbc7b8489..90be4c7325f7 100644 --- a/fs/bcachefs/btree_cache.c +++ b/fs/bcachefs/btree_cache.c @@ -707,6 +707,12 @@ static noinline struct btree *bch2_btree_node_fill(struct bch_fs *c, if (IS_ERR(b)) return b; + /* + * Btree nodes read in from disk should not have the accessed bit set + * initially, so that linear scans don't thrash the cache: + */ + clear_btree_node_accessed(b); + bkey_copy(&b->key, k); if (bch2_btree_node_hash_insert(bc, b, level, btree_id)) { /* raced with another fill: */ @@ -843,6 +849,10 @@ retry: trace_and_count(c, trans_restart_btree_node_reused, trans, trace_ip, path); return ERR_PTR(btree_trans_restart(trans, BCH_ERR_transaction_restart_lock_node_reused)); } + + /* avoid atomic set bit if it's not needed: */ + if (!btree_node_accessed(b)) + set_btree_node_accessed(b); } if (unlikely(btree_node_read_in_flight(b))) { @@ -880,10 +890,6 @@ retry: prefetch(p + L1_CACHE_BYTES * 2); } - /* avoid atomic set bit if it's not needed: */ - if (!btree_node_accessed(b)) - set_btree_node_accessed(b); - if (unlikely(btree_node_read_error(b))) { six_unlock_type(&b->c.lock, lock_type); return ERR_PTR(-EIO); |