These patches use MADV_DONTNEED to clean unused cache entries. Under Linux it frees the memory used by those pages.
Berto Alberto Garcia (3): qcow2: mark the memory as no longer needed after qcow2_cache_empty() qcow2: add option to clean unused cache entries after some time qcow2: reorder fields in Qcow2CachedTable to reduce padding block/qcow2-cache.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++- block/qcow2.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++ block/qcow2.h | 4 ++++ qapi/block-core.json | 6 +++++- 4 files changed, 121 insertions(+), 2 deletions(-) -- 2.1.4
