Btree spliting and garbage collection process will drop
placeholders, which may cause cache miss collision. We can
insert nonoverlapping bkeys with write lock. It is helpful
for performance.
Signed-off-by: Liu Hua <liusdu@xxxxxxx>
---
drivers/md/bcache/extents.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/md/bcache/extents.c b/drivers/md/bcache/extents.c
index c809724e6571..cc8af08aee8d 100644
--- a/drivers/md/bcache/extents.c
+++ b/drivers/md/bcache/extents.c
@@ -329,6 +329,7 @@ static bool bch_extent_insert_fixup(struct btree_keys *b,
uint64_t old_offset;
unsigned int old_size, sectors_found = 0;
+ bool overlay = false;
BUG_ON(!KEY_OFFSET(insert));
BUG_ON(!KEY_SIZE(insert));
@@ -340,15 +341,18 @@ static bool bch_extent_insert_fixup(struct btree_keys *b,
break;
if (bkey_cmp(&START_KEY(k), insert) >= 0) {
- if (KEY_SIZE(k))
- break;
- else
+ if (!KEY_SIZE(k))
continue;
+ if (replace_key && overlay == false)
+ goto out;
+ break;
}
if (bkey_cmp(k, &START_KEY(insert)) <= 0)
continue;
+ overlay = true;
+
old_offset = KEY_START(k);
old_size = KEY_SIZE(k);
--
2.17.1
