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

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Date:	Tue, 8 Oct 2013 12:13:58 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.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


* Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> wrote:

> Ingo Molnar wrote:
> > 
> > * Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> wrote:
> > 
> > > > What must arch maintainers do to enable it?  Have you any particular 
> > > > suggestions, warnings etc to make their lives easier?
> > > 
> > > The last patch is a good illustration what need to be done. It's very 
> > > straight forward, I don't see any pitfalls.
> > 
> > Might make sense to stick that somewhere into Documentation/mm/, to make 
> > arch maintainers feel all warm and fuzzy if they look into enabling this 
> > feature on their architecture.
> 
> 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. ;)
> 
> After that I'll document it. Does it work for you?

Sounds nice to me!

Thanks,

	Ingo
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