Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Wed, 17 Apr 2019 09:13:06 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Waiman Long <longman@redhat.com>
Cc:     Ingo Molnar <mingo@redhat.com>, Will Deacon <will.deacon@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        linux-kernel@vger.kernel.org, x86@kernel.org,
        Davidlohr Bueso <dave@stgolabs.net>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        huang ying <huang.ying.caritas@gmail.com>
Subject: Re: [PATCH v4 07/16] locking/rwsem: Implement lock handoff to
 prevent lock starvation
Message-ID: <20190417071306.GX4038@hirez.programming.kicks-ass.net>
References: <20190413172259.2740-1-longman@redhat.com>
 <20190413172259.2740-8-longman@redhat.com>
 <20190416141205.GK12232@hirez.programming.kicks-ass.net>
 <4b36b0a5-8507-f90c-d4a7-3f821ee8da6d@redhat.com>
 <55474839-269f-4dbc-23af-a9c873db6c66@redhat.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <55474839-269f-4dbc-23af-a9c873db6c66@redhat.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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()