linux-kernel - Re: [PATCH v4 07/16] locking/rwsem: Implement lock handoff to prevent lock starvation

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Message-ID: <20190417071306.GX4038@hirez.programming.kicks-ass.net>
Date:   Wed, 17 Apr 2019 09:13:06 +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>,
        huang ying <huang.ying.caritas@...il.com>
Subject: Re: [PATCH v4 07/16] locking/rwsem: Implement lock handoff to
 prevent lock starvation

On Tue, Apr 16, 2019 at 05:07:26PM -0400, Waiman Long wrote:

> Thinking about it again. I think I will just change its definition to
> "((HZ + 249)/250)" for now to make sure that it is at least 1. The

DIV_ROUND_UP()