mbox series

[v10,0/7] Lcore variables

Message ID 20241011081901.816211-1-mattias.ronnblom@ericsson.com (mailing list archive)
Headers
Series Lcore variables |

Message

Mattias Rönnblom Oct. 11, 2024, 8:18 a.m. UTC 
This patch set introduces a new API <rte_lcore_var.h> for static
per-lcore id data allocation.

Please refer to the <rte_lcore_var.h> API documentation for both a
rationale for this new API, and a comparison to the alternatives
available.

The adoption of this API would affect many different DPDK modules, but
the author updated only a few, mostly to serve as examples in this
RFC, and to iron out some, but surely not all, wrinkles in the API.

The question on how to best allocate static per-lcore memory has been
up several times on the dev mailing list, for example in the thread on
"random: use per lcore state" RFC by Stephen Hemminger.

Lcore variables are surely not the answer to all your per-lcore-data
needs, since it only allows for more-or-less static allocation. In the
author's opinion, it does however provide a reasonably simple and
clean and seemingly very much performant solution to a real problem.

Mattias Rönnblom (7):
  eal: add static per-lcore memory allocation facility
  eal: add lcore variable functional tests
  eal: add lcore variable performance test
  random: keep PRNG state in lcore variable
  power: keep per-lcore state in lcore variable
  service: keep per-lcore state in lcore variable
  eal: keep per-lcore power intrinsics state in lcore variable

 MAINTAINERS                                   |   6 +
 app/test/meson.build                          |   2 +
 app/test/test_lcore_var.c                     | 436 ++++++++++++++++++
 app/test/test_lcore_var_perf.c                | 257 +++++++++++
 config/rte_config.h                           |   1 +
 doc/api/doxy-api-index.md                     |   1 +
 .../prog_guide/env_abstraction_layer.rst      |  43 +-
 doc/guides/rel_notes/release_24_11.rst        |  14 +
 lib/eal/common/eal_common_lcore_var.c         |  85 ++++
 lib/eal/common/meson.build                    |   1 +
 lib/eal/common/rte_random.c                   |  28 +-
 lib/eal/common/rte_service.c                  | 117 ++---
 lib/eal/include/meson.build                   |   1 +
 lib/eal/include/rte_lcore_var.h               | 389 ++++++++++++++++
 lib/eal/version.map                           |   3 +
 lib/eal/x86/rte_power_intrinsics.c            |  17 +-
 lib/power/rte_power_pmd_mgmt.c                |  35 +-
 17 files changed, 1343 insertions(+), 93 deletions(-)
 create mode 100644 app/test/test_lcore_var.c
 create mode 100644 app/test/test_lcore_var_perf.c
 create mode 100644 lib/eal/common/eal_common_lcore_var.c
 create mode 100644 lib/eal/include/rte_lcore_var.h