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zswap: only save zswap header when necessary

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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.

[[email protected]: The zpool->" prefix is a result of copy & paste]
  Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Yu Zhao <[email protected]>
Acked-by: Dan Streetman <[email protected]>
Reviewed-by: Sergey Senozhatsky <[email protected]>
Cc: Seth Jennings <[email protected]>
Cc: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Yu Zhao 2018-01-31 16:19:59 -08:00 • committed by Linus Torvalds
commit 9c3760eb80
4 changed files with 35 additions and 19 deletions
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7
mm/zsmalloc.c
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@ -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,