linux-kernel - Re: [PATCH -tip 0/2] locking/rwbase: Two reader optimizations

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Message-ID: <1676b749-3fca-fa67-03e6-7639ef1f5b33@redhat.com>
Date:   Mon, 20 Sep 2021 17:54:19 -0400
From:   Waiman Long <llong@...hat.com>
To:     Davidlohr Bueso <dave@...olabs.net>, tglx@...utronix.de
Cc:     peterz@...radead.org, mingo@...nel.org, rostedt@...dmis.org,
        bigeasy@...utronix.de, boqun.feng@...il.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip 0/2] locking/rwbase: Two reader optimizations

On 9/20/21 1:20 AM, Davidlohr Bueso wrote:
> Hi,
>
> Patch 1 is a barrier optimization that came up from the reader
> fastpath ordering auditing.
>
> Patch 2 is a resend of the previous broken patch that attempts
> to use wake_q for read_unlock() slowpath.
>
> Tested on v5.15.y-rt. Applies against tip/urgent.
>
> Thanks!
>
> Davidlohr Bueso (2):
>    locking/rwbase: Optimize rwbase_read_trylock
>    locking/rwbase: Lockless reader waking up a writer
>
>   kernel/locking/rtmutex.c   | 19 +++++++++++++------
>   kernel/locking/rwbase_rt.c | 11 +++++++----
>   2 files changed, 20 insertions(+), 10 deletions(-)
>
> --
> 2.26.2
>
Your patches look good to me.

Acked-by: Waiman Long <longman@...hat.com>