[PATCH v2 net-next 0/7] rfs: use high-order allocations for hash tables

[Eric Dumazet <edumazet@google.com>]

This series adds rps_tag_ptr which encodes both a pointer
and a size of a power-of-two hash table in a single long word.

RFS hash tables (global and per rx-queue) are converted to rps_tag_ptr.

This removes a cache line miss, and allows high-order allocations.

The global hash table can benefit from huge pages.

v2: address various kernel bots reports.

Eric Dumazet (7):
  net: add rps_tag_ptr type and helpers
  net-sysfs: remove rcu field from 'struct rps_sock_flow_table'
  net-sysfs: add rps_sock_flow_table_mask() helper
  net-sysfs: use rps_tag_ptr and remove metadata from
    rps_sock_flow_table
  net-sysfs: get rid of rps_dev_flow_lock
  net-sysfs: remove rcu field from 'struct rps_dev_flow_table'
  net-sysfs: use rps_tag_ptr and remove metadata from rps_dev_flow_table

 Documentation/networking/scaling.rst | 13 ++--
 include/net/hotdata.h                |  5 +-
 include/net/netdev_rx_queue.h        |  3 +-
 include/net/rps-types.h              | 24 +++++++
 include/net/rps.h                    | 49 ++++++---------
 net/core/dev.c                       | 61 +++++++++++-------
 net/core/net-sysfs.c                 | 66 +++++++++----------
 net/core/sysctl_net_core.c           | 94 +++++++++++++++-------------
 8 files changed, 176 insertions(+), 139 deletions(-)
 create mode 100644 include/net/rps-types.h

-- 
2.53.0.473.g4a7958ca14-goog