Re: [PATCH 00/11] rcu/nocb: (De-)offloading on offline CPUs

[Paul E. McKenney]

On Thu, May 30, 2024 at 03:45:41PM +0200, Frederic Weisbecker wrote:
> Last LPC's debates seem to have raised general agreement that nohz_full
> cpusets interface should operate on offline CPUs to simplify the picture.
> And since the only known future user of NOCB (de-)offloading is going
> to be nohz_full cpusets, its transitions need to operate on offline
> CPUs as well.
> 
> The good news is that it simplifies a bit the (de-)offloading code, as
> the diffstat testifies.

Good stuf!!!

For the series:

Reviewed-by: Paul E. McKenney <paulmck@xxxxxxxxxx>

> Thanks.
> 
> Frederic Weisbecker (11):
>   rcu/nocb: Introduce RCU_NOCB_LOCKDEP_WARN()
>   rcu/nocb: Move nocb field at the end of state struct
>   rcu/nocb: Assert no callbacks while nocb kthread allocation fails
>   rcu/nocb: Introduce nocb mutex
>   rcu/nocb: (De-)offload callbacks on offline CPUs only
>   rcu/nocb: Remove halfway (de-)offloading handling from bypass
>   rcu/nocb: Remove halfway (de-)offloading handling from rcu_core()'s QS
>     reporting
>   rcu/nocb: Remove halfway (de-)offloading handling from rcu_core
>   rcu/nocb: Remove SEGCBLIST_RCU_CORE
>   rcu/nocb: Remove SEGCBLIST_KTHREAD_CB
>   rcu/nocb: Simplify (de-)offloading state machine
> 
>  include/linux/rcu_segcblist.h |   6 +-
>  include/linux/rcupdate.h      |   7 +
>  kernel/rcu/rcu_segcblist.c    |  11 --
>  kernel/rcu/rcu_segcblist.h    |  11 +-
>  kernel/rcu/tree.c             |  45 +-----
>  kernel/rcu/tree.h             |   6 +-
>  kernel/rcu/tree_nocb.h        | 266 +++++++++++++---------------------
>  kernel/rcu/tree_plugin.h      |   5 +-
>  8 files changed, 122 insertions(+), 235 deletions(-)
> 
> -- 
> 2.45.1
>