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From:   Yury Norov <yury.norov@gmail.com>
To:     linux-kernel@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>,
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        Saeed Mahameed <saeedm@nvidia.com>,
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        Tariq Toukan <tariqt@nvidia.com>,
        Tariq Toukan <ttoukan.linux@gmail.com>,
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        Vincent Guittot <vincent.guittot@linaro.org>
Cc:     Yury Norov <yury.norov@gmail.com>, linux-crypto@vger.kernel.org,
        netdev@vger.kernel.org, linux-rdma@vger.kernel.org
Subject: [PATCH RESEND 0/9] sched: cpumask: improve on cpumask_local_spread() locality
Date:   Fri, 20 Jan 2023 20:24:27 -0800
Message-Id: <20230121042436.2661843-1-yury.norov@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

cpumask_local_spread() currently checks local node for presence of i'th
CPU, and then if it finds nothing makes a flat search among all non-local
CPUs. We can do it better by checking CPUs per NUMA hops.

This has significant performance implications on NUMA machines, for example
when using NUMA-aware allocated memory together with NUMA-aware IRQ
affinity hints.

Performance tests from patch 8 of this series for mellanox network
driver show:

  TCP multi-stream, using 16 iperf3 instances pinned to 16 cores (with aRFS on).
  Active cores: 64,65,72,73,80,81,88,89,96,97,104,105,112,113,120,121
  
  +-------------------------+-----------+------------------+------------------+
  |                         | BW (Gbps) | TX side CPU util | RX side CPU util |
  +-------------------------+-----------+------------------+------------------+
  | Baseline                | 52.3      | 6.4 %            | 17.9 %           |
  +-------------------------+-----------+------------------+------------------+
  | Applied on TX side only | 52.6      | 5.2 %            | 18.5 %           |
  +-------------------------+-----------+------------------+------------------+
  | Applied on RX side only | 94.9      | 11.9 %           | 27.2 %           |
  +-------------------------+-----------+------------------+------------------+
  | Applied on both sides   | 95.1      | 8.4 %            | 27.3 %           |
  +-------------------------+-----------+------------------+------------------+
  
  Bottleneck in RX side is released, reached linerate (~1.8x speedup).
  ~30% less cpu util on TX.

This series was supposed to be included in v6.2, but that didn't happen. It
spent enough in -next without any issues, so I hope we'll finally see it
in v6.3.

I believe, the best way would be moving it with scheduler patches, but I'm
OK to try again with bitmap branch as well.

Tariq Toukan (1):
  net/mlx5e: Improve remote NUMA preferences used for the IRQ affinity
    hints

Valentin Schneider (2):
  sched/topology: Introduce sched_numa_hop_mask()
  sched/topology: Introduce for_each_numa_hop_mask()

Yury Norov (6):
  lib/find: introduce find_nth_and_andnot_bit
  cpumask: introduce cpumask_nth_and_andnot
  sched: add sched_numa_find_nth_cpu()
  cpumask: improve on cpumask_local_spread() locality
  lib/cpumask: reorganize cpumask_local_spread() logic
  lib/cpumask: update comment for cpumask_local_spread()

 drivers/net/ethernet/mellanox/mlx5/core/eq.c | 18 +++-
 include/linux/cpumask.h                      | 20 +++++
 include/linux/find.h                         | 33 +++++++
 include/linux/topology.h                     | 33 +++++++
 kernel/sched/topology.c                      | 90 ++++++++++++++++++++
 lib/cpumask.c                                | 52 ++++++-----
 lib/find_bit.c                               |  9 ++
 7 files changed, 230 insertions(+), 25 deletions(-)

-- 
2.34.1