linux-kernel - Re: [PATCH v2 0/5] Switch arm64 over to qrwlock

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Message-ID: <20171009065243.g4q7l3kf2esa4fkk@hirez.programming.kicks-ass.net>
Date:   Mon, 9 Oct 2017 08:52:43 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Yury Norov <ynorov@...iumnetworks.com>
Cc:     Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, Jeremy.Linton@....com,
        mingo@...hat.com, longman@...hat.com, boqun.feng@...il.com,
        paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH v2 0/5] Switch arm64 over to qrwlock

On Mon, Oct 09, 2017 at 12:30:52AM +0300, Yury Norov wrote:
> The bottomline of discussion [1] was that queued locks are more
> effective when SoC has many CPUs. And 4 is not many.

qspinlock, yes. qrwlock not, as it fully depends on arch_spinlock_t for
the queueing. qrwlock is just a generic rwlock_t implementation.