[Qemu-devel] [PATCH 5/6] qcow2: use a hash to look for entries in the L2 cache

[Alberto Garcia]

The current cache algorithm traverses the array starting always from
the beginning, so the average number of comparisons needed to perform
a lookup is proportional to the size of the array.

By using a hash of the offset as the starting point, lookups are
faster and independent from the array size.

The hash is computed using the cluster number of the table, multiplied
by 4 to make it perform better when there are collisions.

In my tests, using a cache with 2048 entries, this reduces the average
number of comparisons per lookup from 430 to 2.5.

Signed-off-by: Alberto Garcia <address@hidden>
---
 block/qcow2-cache.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/block/qcow2-cache.c b/block/qcow2-cache.c
index e1bba20..c0e0278 100644
--- a/block/qcow2-cache.c
+++ b/block/qcow2-cache.c
@@ -237,6 +237,7 @@ static int qcow2_cache_do_get(BlockDriverState *bs, 
Qcow2Cache *c,
     BDRVQcowState *s = bs->opaque;
     int i;
     int ret;
+    int lookup_index;
     uint64_t min_lru_counter = UINT64_MAX;
     int min_lru_index = -1;
 
@@ -244,7 +245,8 @@ static int qcow2_cache_do_get(BlockDriverState *bs, 
Qcow2Cache *c,
                           offset, read_from_disk);
 
     /* Check if the table is already cached */
-    for (i = 0; i < c->size; i++) {
+    i = lookup_index = (offset / c->table_size * 4) % c->size;
+    do {
         const Qcow2CachedTable *t = &c->entries[i];
         if (t->offset == offset) {
             goto found;
@@ -253,7 +255,10 @@ static int qcow2_cache_do_get(BlockDriverState *bs, 
Qcow2Cache *c,
             min_lru_counter = t->lru_counter;
             min_lru_index = i;
         }
-    }
+        if (++i == c->size) {
+            i = 0;
+        }
+    } while (i != lookup_index);
 
     if (min_lru_index == -1) {
         /* This can't happen in current synchronous code, but leave the check
-- 
2.1.4