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zpool: remove zpool_evict()

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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>
This commit is contained in:
Dan Streetman 2015-06-25 15:00:40 -07:00 • committed by Linus Torvalds
parent cf41f5f496
commit 479305fd71
4 changed files with 24 additions and 36 deletions
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5
include/linux/zpool.h
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@ -81,7 +81,8 @@ struct zpool_driver {
atomic_t refcount;
struct list_head list;
void *(*create)(char *name, gfp_t gfp, struct zpool_ops *ops);
void *(*create)(char *name, gfp_t gfp, struct zpool_ops *ops,
struct zpool *zpool);
void (*destroy)(void *pool);
int (*malloc)(void *pool, size_t size, gfp_t gfp,
@ -102,6 +103,4 @@ void zpool_register_driver(struct zpool_driver *driver);
int zpool_unregister_driver(struct zpool_driver *driver);
int zpool_evict(void *pool, unsigned long handle);
#endif