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From: Andi Kleen <andi@firstfloor.org>
To: Waiman Long <Waiman.Long@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	linux-fsdevel@vger.kernel.org, x86@kernel.org,
	linux-kernel@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	Scott J Norton <scott.norton@hp.com>,
	Douglas Hatch <doug.hatch@hp.com>
Subject: Re: [RFC PATCH 2/3] lib/list_batch, x86: Enable list insertion/deletion batching in x86-64
References: <1453824219-51437-1-git-send-email-Waiman.Long@hpe.com>
	<1453824219-51437-3-git-send-email-Waiman.Long@hpe.com>
Date: Tue, 26 Jan 2016 13:44:13 -0800
In-Reply-To: <1453824219-51437-3-git-send-email-Waiman.Long@hpe.com> (Waiman
	Long's message of "Tue, 26 Jan 2016 11:03:38 -0500")
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Waiman Long <Waiman.Long@hpe.com> writes:
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 330e738..443e41d 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -42,6 +42,7 @@ config X86
>  	select ARCH_SUPPORTS_NUMA_BALANCING	if X86_64
>  	select ARCH_USE_BUILTIN_BSWAP
>  	select ARCH_USE_CMPXCHG_LOCKREF		if X86_64
> +	select ARCH_USE_LIST_BATCHING		if X86_64

I would make it unconditional. The code is simple enough
and shouldn't have drawbacks on smaller systems.

-Andi