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

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Message-ID: <20190410151018.GL7905@worktop.programming.kicks-ass.net>
Date:   Wed, 10 Apr 2019 17:10:18 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Waiman Long <longman@...hat.com>
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 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'.