[dpdk-dev] [RFC 00/10] Support running DPDK without hugetlbfs mountpoint

[Anatoly Burakov]

This patchset takes old debug options "--huge-unlink" and
"--no-shconf" and replaces them both with a new option,
"--no-shared-files". This is a special mode which will
disable support for secondary processes, but which will
cause DPDK to not create any shared files while running -
neither hugepages nor any runtime data (everything will
be entirely in memory).

Additionally, on supported kernel/glibc versions (Linux
4.14+, glibc 2.27+), "--no-shared-files" mode will also
reserve hugepages using memfd instead of relying on
hugetlbfs mountpoint. This will make it possible to use
DPDK without hugetlbfs mountpoints (e.g. container use
cases).

This changes functionality of several command-line
switches, so RFC for now. Maybe we could leave the old
switches as they are and deprecate them in the next
release?

Anatoly Burakov (10):
  eal: add --no-shared-files option
  eal: make --no-shconf an alias for --no-shared-files
  eal: make --huge-unlink an alias for --no-shared-files
  fbarray: support no-shared-files mode
  mem: add support for no-shared-files mode
  ipc: add support for no-shared-files mode
  eal: add support for no-shared-files for hugepage info
  eal: add support for no-shared-files in hugepage data file
  eal: do not create runtime dir in no-shared-files mode
  mem: enable memfd-based hugepage allocation

 lib/librte_eal/bsdapp/eal/eal.c               |   7 +-
 lib/librte_eal/bsdapp/eal/eal_hugepage_info.c |   4 +
 lib/librte_eal/common/eal_common_fbarray.c    |  71 +++++----
 lib/librte_eal/common/eal_common_memory.c     |   3 +-
 lib/librte_eal/common/eal_common_options.c    |  25 ++--
 lib/librte_eal/common/eal_common_proc.c       |  25 ++++
 lib/librte_eal/common/eal_internal_cfg.h      |   3 +-
 lib/librte_eal/common/eal_options.h           |   7 +-
 lib/librte_eal/linuxapp/eal/eal.c             |  18 ++-
 .../linuxapp/eal/eal_hugepage_info.c          | 140 ++++++++++++++----
 lib/librte_eal/linuxapp/eal/eal_memalloc.c    | 126 +++++++++++++++-
 lib/librte_eal/linuxapp/eal/eal_memfd.h       |  28 ++++
 lib/librte_eal/linuxapp/eal/eal_memory.c      |  19 ++-
 test/test/test_eal_flags.c                    |  18 +--
 14 files changed, 384 insertions(+), 110 deletions(-)
 create mode 100644 lib/librte_eal/linuxapp/eal/eal_memfd.h

-- 
2.17.0