linux-kernel - Re: [PATCH-tip v2 02/12] locking/rwsem: Implement lock handoff to prevent lock starvation

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Message-ID: <cc24e1ab-689a-9ef4-67ba-5791c40dfee2@redhat.com>
Date:   Wed, 10 Apr 2019 11:29:26 -0400
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Davidlohr Bueso <dave@...olabs.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>
Subject: Re: [PATCH-tip v2 02/12] locking/rwsem: Implement lock handoff to
 prevent lock starvation

On 04/10/2019 11:10 AM, Peter Zijlstra wrote:
> On Fri, Apr 05, 2019 at 03:21:05PM -0400, Waiman Long wrote:
>> +#define RWSEM_WAIT_TIMEOUT	((HZ - 1)/200 + 1)
> Given the choices in HZ, the above seems fairly 'optimistic'.

I can tighten it up and make it less "optimistic" :-)

Cheers,
Longman