linux-kernel - Re: [PATCH v2 4/4] futex: Avoid taking hb lock if nothing to wakeup

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Message-ID: <20131210160801.GL12849@twins.programming.kicks-ass.net>
Date:	Tue, 10 Dec 2013 17:08:01 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	dvhart@...ux.intel.com, tglx@...utronix.de,
	paulmck@...ux.vnet.ibm.com, efault@....de, jeffm@...e.com,
	torvalds@...ux-foundation.org, scott.norton@...com,
	tom.vaden@...com, aswin@...com, Waiman.Long@...com,
	jason.low2@...com
Subject: Re: [PATCH v2 4/4] futex: Avoid taking hb lock if nothing to wakeup

On Tue, Dec 03, 2013 at 01:45:27AM -0800, Davidlohr Bueso wrote:
> With the new atomic counter we only enlarge the futex_hash_bucket struct
> by 4 bytes on 32bit systems, and it is left the same size for 64bit
> ones, at 24 bytes.

patch 2 grew the structure to be an entire cacheline, this now seems a
rather pointless comment ;-)
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