zpool: remove zpool_evict()
Remove zpool_evict() helper function. As zbud is currently the only
zpool implementation that supports eviction, add zpool and zpool_ops
references to struct zbud_pool and directly call zpool_ops->evict(zpool,
handle) on eviction.
Currently zpool provides the zpool_evict helper which locks the zpool
list lock and searches through all pools to find the specific one
matching the caller, and call the corresponding zpool_ops->evict
function. However, this is unnecessary, as the zbud pool can simply
keep a reference to the zpool that created it, as well as the zpool_ops,
and directly call the zpool_ops->evict function, when it needs to evict
a page. This avoids a spinlock and list search in zpool for each
eviction.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Cc: Seth Jennings <sjennings@variantweb.net>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/zbud.c b/mm/zbud.c
index 2ee4e45..f3bf6f7 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -97,6 +97,10 @@
struct list_head lru;
u64 pages_nr;
struct zbud_ops *ops;
+#ifdef CONFIG_ZPOOL
+ struct zpool *zpool;
+ struct zpool_ops *zpool_ops;
+#endif
};
/*
@@ -123,7 +127,10 @@
static int zbud_zpool_evict(struct zbud_pool *pool, unsigned long handle)
{
- return zpool_evict(pool, handle);
+ if (pool->zpool && pool->zpool_ops && pool->zpool_ops->evict)
+ return pool->zpool_ops->evict(pool->zpool, handle);
+ else
+ return -ENOENT;
}
static struct zbud_ops zbud_zpool_ops = {
@@ -131,9 +138,17 @@
};
static void *zbud_zpool_create(char *name, gfp_t gfp,
- struct zpool_ops *zpool_ops)
+ struct zpool_ops *zpool_ops,
+ struct zpool *zpool)
{
- return zbud_create_pool(gfp, zpool_ops ? &zbud_zpool_ops : NULL);
+ struct zbud_pool *pool;
+
+ pool = zbud_create_pool(gfp, zpool_ops ? &zbud_zpool_ops : NULL);
+ if (pool) {
+ pool->zpool = zpool;
+ pool->zpool_ops = zpool_ops;
+ }
+ return pool;
}
static void zbud_zpool_destroy(void *pool)
@@ -292,7 +307,7 @@
struct zbud_pool *pool;
int i;
- pool = kmalloc(sizeof(struct zbud_pool), gfp);
+ pool = kzalloc(sizeof(struct zbud_pool), gfp);
if (!pool)
return NULL;
spin_lock_init(&pool->lock);