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authorYu Zhao <yuzhao@google.com>2018-01-31 16:19:59 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 17:18:39 -0800
commit9c3760eb80880f3e02546e0a2ef479e1454986b3 (patch)
treee0f90aca53a602676bf50160ad1efbe0ac66a352 /include/linux/zpool.h
parenta7ab400d6fe73d0119fdc234e9982a6f80faea9f (diff)
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.h2
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