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Date: Tue, 8 Oct 2013 11:56:02 +0200
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCHv5 00/11] split page table lock for PMD tables
Message-ID: <20131008095602.GR3081@twins.programming.kicks-ass.net>
References: <1381154053-4848-1-git-send-email-kirill.shutemov@linux.intel.com>
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To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Ingo Molnar <mingo@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Alex Thorlton <athorlton@sgi.com>, Ingo Molnar <mingo@redhat.com>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, "Eric W . Biederman" <ebiederm@xmission.com>, "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>, Al Viro <viro@zeniv.linux.org.uk>, Andi Kleen <ak@linux.intel.com>, Andrea Arcangeli <aarcange@redhat.com>, Dave Hansen <dave.hansen@intel.com>, Dave Jones <davej@redhat.com>, David Howells <dhowells@redhat.com>, Frederic Weisbecker <fweisbec@gmail.com>, Johannes Weiner <hannes@cmpxchg.org>, Kees Cook <keescook@chromium.org>, Mel Gorman <mgorman@suse.de>, Michael Kerrisk <mtk.manpages@gmail.com>, Oleg Nesterov <oleg@redhat.com>, Rik van Riel <riel@redhat.com>, Robin Holt <robinmholt@gmail.com>, Sedat Dilek <sedat.dilek@gmail.com>, Srikar Dronamraju <srikar@linux.vnet.ibm.com>, Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org, linux-mm@kvack.org

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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