In order to allow zswap users to choose between zbud and zsmalloc for the compressed storage pool, this patch set adds a new api "zpool" that provides an interface to both zbud and zsmalloc. Only a minor changes to zbud's interface were needed, as detailed in the first two patches. This does not implement zsmalloc shrinking (which will be submitted separately), so when using zsmalloc as the pool type, zpool_shrink() will always fail. I believe Seth originally was using zsmalloc for swap, but there were concerns about how significant the impact of shrinking zsmalloc would be when zswap had to start reclaiming pages. That still may be an issue, but this at least allows users to choose themselves whether they want a lower-density or higher-density compressed storage medium. At least for situations where zswap reclaim is never or rarely reached, it probably makes sense to use the higher density of zsmalloc. Note this patch series does not change zram to use zpool, although that change should be possible as well. This patchset is against git://git.cmpxchg.org/linux-mmotm.git commit a51cc1787cdef3f17536d6a6dc1edd0e7a85988f Changes since v1 https://lkml.org/lkml/2014/4/19/97 -remove zsmalloc shrinking -change zbud size param type from unsigned int to size_t -remove zpool fallback creation -zswap manually falls back to zbud if specified type fails Dan Streetman (4): mm/zbud: zbud_alloc() minor param change mm/zbud: change zbud_alloc size type to size_t mm/zpool: implement common zpool api to zbud/zsmalloc mm/zswap: update zswap to use zpool include/linux/zbud.h | 2 +- include/linux/zpool.h | 160 +++++++++++++++++++++++ mm/Kconfig | 43 ++++--- mm/Makefile | 1 + mm/zbud.c | 30 +++-- mm/zpool.c | 349 ++++++++++++++++++++++++++++++++++++++++++++++++++ mm/zswap.c | 75 ++++++----- 7 files changed, 596 insertions(+), 64 deletions(-) create mode 100644 include/linux/zpool.h create mode 100644 mm/zpool.c -- 1.8.3.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>