diff options
Diffstat (limited to 'drivers/md/bcache/alloc.c')
| -rw-r--r-- | drivers/md/bcache/alloc.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/md/bcache/alloc.c b/drivers/md/bcache/alloc.c index bcfd96e2121b..c0d37d082443 100644 --- a/drivers/md/bcache/alloc.c +++ b/drivers/md/bcache/alloc.c @@ -168,8 +168,21 @@ static void invalidate_one_bucket(struct cache *ca, struct bucket *b) fifo_push(&ca->free_inc, b - ca->buckets); } -#define bucket_prio(b) \ - (((unsigned) (b->prio - ca->set->min_prio)) * GC_SECTORS_USED(b)) +/* + * Determines what order we're going to reuse buckets, smallest bucket_prio() + * first: we also take into account the number of sectors of live data in that + * bucket, and in order for that multiply to make sense we have to scale bucket + * + * Thus, we scale the bucket priorities so that the bucket with the smallest + * prio is worth 1/8th of what INITIAL_PRIO is worth. + */ + +#define bucket_prio(b) \ +({ \ + unsigned min_prio = (INITIAL_PRIO - ca->set->min_prio) / 8; \ + \ + (b->prio - ca->set->min_prio + min_prio) * GC_SECTORS_USED(b); \ +}) #define bucket_max_cmp(l, r) (bucket_prio(l) < bucket_prio(r)) #define bucket_min_cmp(l, r) (bucket_prio(l) > bucket_prio(r)) |