linux-kernel - Re: [PATCH] locking/percpu_rwsem: Rewrite to not use rwsem

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Message-ID: <20191030155720.GA20713@redhat.com>
Date:   Wed, 30 Oct 2019 16:57:20 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, bigeasy@...utronix.de,
        juri.lelli@...hat.com, williams@...hat.com, bristot@...hat.com,
        longman@...hat.com, dave@...olabs.net, jack@...e.com
Subject: Re: [PATCH] locking/percpu_rwsem: Rewrite to not use rwsem

On 10/29, Peter Zijlstra wrote:
>
> That said, I think cgroups use a variant of percpu-rwsem that wreck rss
> on purpose and always take the slowpaths.

I forgot (never understodd) why does Android need this.

I am wondering if it makes any sense to add a config/boot or even runtime
knob for cgroup_threadgroup_rwsem.

Oleg.