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 minor changes to zbud's interface were needed. This does not include implementing shrinking in zsmalloc, which will be sent separately.
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 set does not change zram to use zpool, although that change should be possible as well. --- Changes since v2 : https://lkml.org/lkml/2014/5/7/927 -Change zpool to use driver registration instead of hardcoding implementations -Add module use counting in zbud/zsmalloc 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 (6): 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/zpool: zbud/zsmalloc implement zpool mm/zpool: update zswap to use zpool mm/zpool: prevent zbud/zsmalloc from unloading when used include/linux/zbud.h | 2 +- include/linux/zpool.h | 214 ++++++++++++++++++++++++++++++++++++++++++++++++++ mm/Kconfig | 43 +++++----- mm/Makefile | 1 + mm/zbud.c | 113 ++++++++++++++++++++++---- mm/zpool.c | 197 ++++++++++++++++++++++++++++++++++++++++++++++ mm/zsmalloc.c | 86 ++++++++++++++++++++ mm/zswap.c | 76 ++++++++++-------- 8 files changed, 668 insertions(+), 64 deletions(-) create mode 100644 include/linux/zpool.h create mode 100644 mm/zpool.c -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
