linux-kernel - Re: Regression: x86/mm: new _PTE_SWP_SOFT_DIRTY bit conflicts with existing use

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Date:	Thu, 22 Aug 2013 17:12:21 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Emelyanov <xemul@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, Xen-devel@...ts.xen.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Jan Beulich <jbeulich@...e.com>
Subject: Re: Regression: x86/mm: new _PTE_SWP_SOFT_DIRTY bit conflicts with
 existing use

On Thu, Aug 22, 2013 at 03:37:33PM +0900, Minchan Kim wrote:
> > 
> > Look, good thing is that 7th bit also available on the 4level pages
> > (ie x86-64) without additional code modification, that's why I picked
> > it in first place. I prepared the patch locally which doesn't use
> > pse bit for tracking but it only makes code more complex.
> 
> I'm not sure you read this thread.
> http://comments.gmane.org/gmane.linux.kernel.mm/101756
> In summary, I'd like to use it to track sub-ranges of some processes.
> 
> I already had a time to investigate and it enhanced our workload x2 on ARM
> so I'd like to expand the concept for more general purpose.
> 
> For it, arch-specific stuff would be hurdle for port.
> So, I support your non-arch-specific solutions.
> Just FYI. Such future plan shouldn't force you.

Hi Minchan, thanks for info, I'll read the thread (sorry for delay,
managed to miss your email).
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