linux-kernel - Re: [RFC PATCH 2/3] lib/list_batch, x86: Enable list insertion/deletion batching in x86-64

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Date:	Tue, 26 Jan 2016 13:44:13 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	Waiman Long <Waiman.Long@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Scott J Norton <scott.norton@...com>,
	Douglas Hatch <doug.hatch@...com>
Subject: Re: [RFC PATCH 2/3] lib/list_batch, x86: Enable list insertion/deletion batching in x86-64

Waiman Long <Waiman.Long@....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