diff options
| author |   Yu Zhao <yuzhao@google.com> | 2018-01-31 16:19:59 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-31 17:18:39 -0800 |
| commit | 9c3760eb80880f3e02546e0a2ef479e1454986b3 (patch) | |
| tree | e0f90aca53a602676bf50160ad1efbe0ac66a352 /include/linux/zpool.h | |
| parent | mm/fadvise: discard partial page if endbyte is also EOF (diff) | |
| download | wireguard-linux-9c3760eb80880f3e02546e0a2ef479e1454986b3.tar.xz wireguard-linux-9c3760eb80880f3e02546e0a2ef479e1454986b3.zip | |
zswap: only save zswap header when necessary
We waste sizeof(swp_entry_t) for zswap header when using zsmalloc as
zpool driver because zsmalloc doesn't support eviction.
Add zpool_evictable() to detect if zpool is potentially evictable, and
use it in zswap to avoid waste memory for zswap header.
[yuzhao@google.com: The zpool->" prefix is a result of copy & paste]
Link: http://lkml.kernel.org/r/20180110225626.110330-1-yuzhao@google.com
Link: http://lkml.kernel.org/r/20180110224741.83751-1-yuzhao@google.com
Signed-off-by: Yu Zhao <yuzhao@google.com>
Acked-by: Dan Streetman <ddstreet@ieee.org>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/zpool.h')
| -rw-r--r-- | include/linux/zpool.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/zpool.h b/include/linux/zpool.h index 004ba807df96..7238865e75b0 100644 --- a/include/linux/zpool.h +++ b/include/linux/zpool.h @@ -108,4 +108,6 @@ void zpool_register_driver(struct zpool_driver *driver); int zpool_unregister_driver(struct zpool_driver *driver); +bool zpool_evictable(struct zpool *pool); + #endif |