linux-kernel - Re: [PATCHv5 00/11] split page table lock for PMD tables

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Message-ID: <20131008095602.GR3081@twins.programming.kicks-ass.net>
Date:	Tue, 8 Oct 2013 11:56:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alex Thorlton <athorlton@....com>,
	Ingo Molnar <mingo@...hat.com>,
	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 Hansen <dave.hansen@...el.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>,
	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: [PATCHv5 00/11] split page table lock for PMD tables

On Tue, Oct 08, 2013 at 12:50:06PM +0300, Kirill A. Shutemov wrote:
> I want to rework code around page->ptl a bit more:
>  - allow pgtable_page_ctor() to fail and modify callers to handle it;
>  - if sizeof(spinlock_t) > sizeof(long) allocate the spinlock_t
>    dynamically.
> 
> It will allow to use split lock with DEBUG_SPINLOCK and DEBUG_LOCK_ALLOC.
> And it will make -rt guys happier. ;)

Oh yes, if you've got the time to do that, that would be great. It would
reduce the -rt patch by one ugly hack.
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