linux-kernel - Re: [PATCH-tip v7 11/20] locking/rwsem: Wake up almost all readers in wait queue

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Message-ID: <20190506114927.GJ2623@hirez.programming.kicks-ass.net>
Date:   Mon, 6 May 2019 13:49:27 +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>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, 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-tip v7 11/20] locking/rwsem: Wake up almost all readers
 in wait queue

On Fri, May 03, 2019 at 01:15:22PM -0400, Waiman Long wrote:
> Yes, that can work. However, that will require adding one more pointer
> to the rw_semaphore structure. The performance gain with this
> optimization may not justify increasing the size of the structure by 4/8
> bytes.

Indeed; what was I thinking :-)