[PATCH v3 0/5] Defer lcore variables allocation

[David Marchand <david.marchand@redhat.com>]

As I had reported in 24.11-rc2, the lcore variables allocation have a
noticeable impact on applications consuming DPDK, even when such
applications does not use DPDK, or use features associated to
some lcore variables.

While the amount has been reduced in a rush before rc2,
there are still cases when the increased memory footprint is noticed
like in scaling tests.
See https://bugs.launchpad.net/ubuntu/+source/dpdk/+bug/2090931


lcore variable allocations in constructor is a bad idea, as the
application consuming DPDK has no control over such allocation:
linking some code does not mean that all of it will be used at runtime.

The general question on whether lcore variables in constructor should
be forbidden, is left to a later discussion.

For now, this series only focus on fixing subsystems using lcore
variables so that those allocations are deferred either in rte_eal_init()
or in the path that does require such lcore variables.


-- 
David Marchand

Changes since v2:
- added assert in rte_s?rand(),

Changes since v1:
- added a check on lcore handle,
- fixed lcore variable size in lib/power,
- renamed/introduced allocation helpers,


David Marchand (5):
  eal: check lcore variable handle
  random: defer seeding to EAL init
  power: defer lcore variable allocation
  power: reduce memory footprint of per-lcore state
  eal/x86: defer power intrinsics variable allocation

 lib/eal/common/eal_private.h       |  6 ++++++
 lib/eal/common/rte_random.c        | 12 +++++++++---
 lib/eal/freebsd/eal.c              |  2 ++
 lib/eal/include/rte_lcore_var.h    |  2 ++
 lib/eal/linux/eal.c                |  2 ++
 lib/eal/windows/eal.c              |  2 ++
 lib/eal/x86/rte_power_intrinsics.c | 15 +++++++++++++--
 lib/power/rte_power_pmd_mgmt.c     | 29 ++++++++++++++++++++---------
 8 files changed, 56 insertions(+), 14 deletions(-)

-- 
2.48.1