ACK: [PULL][lunar] sched: cpumask: improve on cpumask_local_spread() locality

[Tim Gardner]

On 3/22/23 3:50 PM, dann frazier wrote:
> BugLink: https://bugs.launchpad.net/bugs/2008824
> 
> A patch series landed upstream during the v6.3 merge window that shows
> impressive performance improvements in iperf3 multi-stream performance
> on NUMA based systems w/ Mellanox network controllers:
>    https://www.spinics.net/lists/linux-rdma/msg115357.html
> 
> It cherry-picks cleanly back to lunar's 6.2. I looked for any
> following commits with Fixes: references to these commits, and found
> one which I've also included here.
> 
> Running our 8 client ubuntu_performance_iperf3 test from autotest
> shows a 7% improvement with a test kernel I built in ppa:dannf/mlnxaffinity.
> (I measured w/o "set_irq_affinity.sh" tuning, so I could see the
> impact on default behavior).
> 
> The following changes since commit a89b4899c906ed38ab38a41f4d2448d834e42b8e:
> 
>    UBUNTU: [Config] define CONFIG_SECURITY_APPARMOR_RESTRICT_USERNS (2023-03-22 08:42:33 +0100)
> 
> are available in the Git repository at:
> 
>    git://git.launchpad.net/~dannf/ubuntu/+source/linux/+git/linux 6f413f056d9b32d7b78d14ebe3fa96a0813c8db3
> 
> for you to fetch changes up to 6f413f056d9b32d7b78d14ebe3fa96a0813c8db3:
> 
>    sched/topology: fix KASAN warning in hop_cmp() (2023-03-22 10:43:01 -0600)
> 
> ----------------------------------------------------------------
> 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 (7):
>        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()
>        sched/topology: fix KASAN warning in hop_cmp()
> 
>   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                      | 95 ++++++++++++++++++++++++++++
>   lib/cpumask.c                                | 52 ++++++++-------
>   lib/find_bit.c                               |  9 +++
>   7 files changed, 235 insertions(+), 25 deletions(-)
> 
Acked-by: Tim Gardner <tim.gardner at canonical.com>
-- 
-----------
Tim Gardner
Canonical, Inc