[dpdk-dev] [PATCH v3 0/3] Improve zero-length memzone allocation
Anatoly Burakov
anatoly.burakov at intel.com
Thu May 3 19:17:58 CEST 2018
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.
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 | 62 ++---------
lib/librte_eal/common/include/rte_malloc.h | 1 +
lib/librte_eal/common/include/rte_memzone.h | 18 ++++
lib/librte_eal/common/malloc_elem.c | 77 ++++++++++++++
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 | 157 +++++++++++++++-------------
9 files changed, 342 insertions(+), 122 deletions(-)
--
2.7.4
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