zpool: remove zpool_evict()
authorDan Streetman <ddstreet@ieee.org>
Thu, 25 Jun 2015 22:00:40 +0000 (15:00 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 26 Jun 2015 00:00:37 +0000 (17:00 -0700)
commit479305fd7172503772575997eb6f1b0a2bb4a107
tree134e5910aa691a12002a95b47c5ea2ee2b148123
parentcf41f5f496d68f2ced1fc77871c63d1c526fa100
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>
include/linux/zpool.h
mm/zbud.c
mm/zpool.c
mm/zsmalloc.c