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authorYu Zhao <yuzhao@google.com>2018-02-01 03:19:59 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-01 04:18:39 +0300
commit9c3760eb80880f3e02546e0a2ef479e1454986b3 (patch)
treee0f90aca53a602676bf50160ad1efbe0ac66a352 /mm/zsmalloc.c
parenta7ab400d6fe73d0119fdc234e9982a6f80faea9f (diff)
downloadlinux-9c3760eb80880f3e02546e0a2ef479e1454986b3.tar.xz
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 'mm/zsmalloc.c')
-rw-r--r--mm/zsmalloc.c7
1 files changed, 0 insertions, 7 deletions
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index e136a8e72c48..f797d8b0d820 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -404,12 +404,6 @@ static void zs_zpool_free(void *pool, unsigned long handle)
zs_free(pool, handle);
}
-static int zs_zpool_shrink(void *pool, unsigned int pages,
- unsigned int *reclaimed)
-{
- return -EINVAL;
-}
-
static void *zs_zpool_map(void *pool, unsigned long handle,
enum zpool_mapmode mm)
{
@@ -447,7 +441,6 @@ static struct zpool_driver zs_zpool_driver = {
.destroy = zs_zpool_destroy,
.malloc = zs_zpool_malloc,
.free = zs_zpool_free,
- .shrink = zs_zpool_shrink,
.map = zs_zpool_map,
.unmap = zs_zpool_unmap,
.total_size = zs_zpool_total_size,