linux-kernel - Re: [PATCH 8/9] mm: implement split page table lock for PMD level

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Message-ID: <52336E41.40307@intel.com>
Date:	Fri, 13 Sep 2013 12:57:53 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Alex Thorlton <athorlton@....com>, Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	"Eric W . Biederman" <ebiederm@...ssion.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andi Kleen <ak@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Dave Jones <davej@...hat.com>,
	David Howells <dhowells@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Kees Cook <keescook@...omium.org>,
	Mel Gorman <mgorman@...e.de>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Robin Holt <robinmholt@...il.com>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 8/9] mm: implement split page table lock for PMD level

On 09/13/2013 06:06 AM, Kirill A. Shutemov wrote:
> +config ARCH_ENABLE_SPLIT_PMD_PTLOCK
> +	boolean
> +
> +config SPLIT_PMD_PTLOCK_CPUS
> +	int
> +	# hugetlb hasn't converted to split locking yet
> +	default "999999" if HUGETLB_PAGE
> +	default "32" if ARCH_ENABLE_SPLIT_PMD_PTLOCK
> +	default "999999"

Is there a reason we should have separate config knobs for this from
SPLIT_PTLOCK_CPUS?  Seem a bit silly.
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