This patch-set adds the following enhancements to the VMware balloon driver: 1. Balloon compaction support. 2. Report the number of inflated/deflated ballooned pages through vmstat. 3. Memory shrinker to avoid balloon over-inflation (and OOM). 4. Support VMs with memory limit that is greater than 16TB. 5. Faster and more aggressive inflation. To support compaction we wish to use the existing infrastructure. However, we need to make slight adaptions for it. We add a new list interface to balloon-compaction, which is more generic and efficient, since it does not require as many IRQ save/restore operations. We leave the old interface that is used by the virtio balloon. Big parts of this patch-set are cleanup and documentation. Patches 1-13 simplify the balloon code, document its behavior and allow the balloon code to run concurrently. The support for concurrency is required for compaction and the shrinker interface. For documentation we use the kernel-doc format. We are aware that the balloon interface is not public, but following the kernel-doc format may be useful one day. v2->v3: * Moving the balloon magic-number out of uapi (Greg) v1->v2: * Fix build error when THP is off (kbuild) * Fix build error on i386 (kbuild) Cc: Xavier Deguillard <xdeguillard@xxxxxxxxxx> Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx> Cc: Jason Wang <jasowang@xxxxxxxxxx> Cc: linux-mm@xxxxxxxxx Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx Nadav Amit (19): vmw_balloon: handle commands in a single function. vmw_balloon: unify commands tracing and stats vmw_balloon: merge send_lock and send_unlock path vmw_balloon: simplifying batch access vmw_balloon: remove sleeping allocations vmw_balloon: change batch/single lock abstractions vmw_balloon: treat all refused pages equally vmw_balloon: rename VMW_BALLOON_2M_SHIFT to VMW_BALLOON_2M_ORDER vmw_balloon: refactor change size from vmballoon_work vmw_balloon: simplify vmballoon_send_get_target() vmw_balloon: stats rework vmw_balloon: rework the inflate and deflate loops vmw_balloon: general style cleanup vmw_balloon: add reset stat mm/balloon_compaction: suppress allocation warnings mm/balloon_compaction: list interfaces vmw_balloon: compaction support vmw_balloon: memory shrinker vmw_balloon: split refused pages Xavier Deguillard (1): vmw_balloon: support 64-bit memory limit drivers/misc/Kconfig | 1 + drivers/misc/vmw_balloon.c | 2198 +++++++++++++++++++--------- include/linux/balloon_compaction.h | 4 + mm/balloon_compaction.c | 142 +- 4 files changed, 1578 insertions(+), 767 deletions(-) -- 2.17.1
