This patchset does two things. First, it enables reserving memzones of zero-length that are IOVA-contiguous. Second, it fixes a long-standing race condition in reserving zero-length memzones, where malloc heap is not locked between stats collection and reservation, and will instead allocate biggest element on the spot.
Some limitations are added, but they are a trade-off between not having race conditions and user convenience. It would be possible to lock all heaps during memzone reserve for zero- length, and that would keep the old behavior, but given how such allocation (especially when asking for IOVA-contiguous memory) may take a long time, a design decision was made to keep things simple, and only check other heaps if the current one is completely busy. Ideas on improvement are welcome. v5: - Use bound length if reserving memzone with zero length v4: - Fixes in memzone test - Account for element padding - Fix for wrong memzone size being returned - Documentation fixes Anatoly Burakov (3): malloc: add biggest free IOVA-contiguous element to stats malloc: allow reserving biggest element memzone: improve zero-length memzone reserve lib/librte_eal/common/eal_common_memzone.c | 70 +++--------- lib/librte_eal/common/include/rte_malloc.h | 1 + lib/librte_eal/common/include/rte_memzone.h | 21 ++++ lib/librte_eal/common/malloc_elem.c | 79 +++++++++++++ lib/librte_eal/common/malloc_elem.h | 6 + lib/librte_eal/common/malloc_heap.c | 137 +++++++++++++++++++++++ lib/librte_eal/common/malloc_heap.h | 4 + lib/librte_eal/common/rte_malloc.c | 2 + test/test/test_memzone.c | 165 ++++++++++++++++------------ 9 files changed, 360 insertions(+), 125 deletions(-) -- 2.7.4
