Re: [PATCH v5 0/4] Reduce synchronize_rcu() latency(v5)

Paul E. McKenney
2024-02-21T01:53:54Z

On Tue, Feb 20, 2024 at 07:31:11PM +0100, Uladzislau Rezki (Sony) wrote:
> This is a v5 that tends to improve synchronize_rcu() call in terms of
> latency reduction. This has been developed together with Neeraj Upadhyay.
> The delta between previous v4 and v5 is rather small. Main difference
> are cosmetic changes related to patch squashing and data structures
> splitting.
>
> It is based on Paul's dev branch.

Very good, thank you!

Queued for further review and testing.

Thanx, Paul

> v4 -> v5:
> - furthers squashing to reduce number of patches;
> - remove the CONFIG_RCU_SR_NORMAL_DEBUG_GP Kconfig option and
> reuse already existing debug option which is CONFIG_PROVE_RCU;
> - add data structures in a separate patch.
>
> v4: https://lore.kernel.org/lkml/ZZ2bi5iPwXLgjB-f@google.com/T/
> v3: https://lore.kernel.org/lkml/cd45b0b5-f86b-43fb-a5f3-47d340cd4f9f@paulmck-laptop/T/
> v2: https://lore.kernel.org/all/20231030131254.488186-1-urezki@gmail.com/T/
> v1: https://lore.kernel.org/lkml/20231025140915.590390-1-urezki@gmail.com/T/
>
> Uladzislau Rezki (Sony) (4):
> rcu: Add data structures for synchronize_rcu()
> rcu: Reduce synchronize_rcu() latency
> rcu: Add a trace event for synchronize_rcu_normal()
> rcu: Support direct wake-up of synchronize_rcu() users
>
> .../admin-guide/kernel-parameters.txt | 14 +
> include/trace/events/rcu.h | 27 ++
> kernel/rcu/tree.c | 363 +++++++++++++++++-
> kernel/rcu/tree.h | 20 +
> kernel/rcu/tree_exp.h | 2 +-
> 5 files changed, 424 insertions(+), 2 deletions(-)
>
> --
> 2.39.2
>