linux-kernel - Re: [PATCH v5 0/4] Reduce synchronize

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Message-ID: <70c597d0-7c4f-4b55-bdea-f6bc411862f6@paulmck-laptop>
Date: Tue, 20 Feb 2024 17:53:54 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: "Uladzislau Rezki (Sony)" <urezki@...il.com>
Cc: RCU <rcu@...r.kernel.org>, Neeraj upadhyay <Neeraj.Upadhyay@....com>,
	Boqun Feng <boqun.feng@...il.com>, Hillf Danton <hdanton@...a.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
	Frederic Weisbecker <frederic@...nel.org>
Subject: Re: [PATCH v5 0/4] Reduce synchronize_rcu() latency(v5)

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
>