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| author | Coly Li <colyli@suse.de> | 2019-06-28 19:59:55 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-06-28 07:39:17 -0600 |
| commit | e5ec5f4765ada9c75fb3eee93a6e72f0e50599d5 (patch) | |
| tree | d084eba7ad58cc4852a9d6d58f4c539f4c155684 /drivers/md | |
| parent | 249a5f6da57c28a903c75d81505d58ec8c10030d (diff) | |
| download | linux-e5ec5f4765ada9c75fb3eee93a6e72f0e50599d5.tar.gz linux-e5ec5f4765ada9c75fb3eee93a6e72f0e50599d5.tar.bz2 linux-e5ec5f4765ada9c75fb3eee93a6e72f0e50599d5.zip | |
bcache: only clear BTREE_NODE_dirty bit when it is set
In bch_btree_cache_free() and btree_node_free(), BTREE_NODE_dirty is
always set no matter btree node is dirty or not. The code looks like
this,
if (btree_node_dirty(b))
btree_complete_write(b, btree_current_write(b));
clear_bit(BTREE_NODE_dirty, &b->flags);
Indeed if btree_node_dirty(b) returns false, it means BTREE_NODE_dirty
bit is cleared, then it is unnecessary to clear the bit again.
This patch only clears BTREE_NODE_dirty when btree_node_dirty(b) is
true (the bit is set), to save a few CPU cycles.
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/bcache/btree.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index cf38a1b031fa..88e5aa3fbb07 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -782,10 +782,10 @@ void bch_btree_cache_free(struct cache_set *c) while (!list_empty(&c->btree_cache)) { b = list_first_entry(&c->btree_cache, struct btree, list); - if (btree_node_dirty(b)) + if (btree_node_dirty(b)) { btree_complete_write(b, btree_current_write(b)); - clear_bit(BTREE_NODE_dirty, &b->flags); - + clear_bit(BTREE_NODE_dirty, &b->flags); + } mca_data_free(b); } @@ -1073,9 +1073,10 @@ static void btree_node_free(struct btree *b) mutex_lock(&b->write_lock); - if (btree_node_dirty(b)) + if (btree_node_dirty(b)) { btree_complete_write(b, btree_current_write(b)); - clear_bit(BTREE_NODE_dirty, &b->flags); + clear_bit(BTREE_NODE_dirty, &b->flags); + } mutex_unlock(&b->write_lock); |