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From: Robin Holt <holt@sgi.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: Robin Holt <holt@sgi.com>, Andrea Arcangeli <andrea@qumranet.com>,
	Avi Kivity <avi@qumranet.com>, Izik Eidus <izike@qumranet.com>,
	kvm-devel@lists.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	steiner@sgi.com, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, daniel.blueman@quadrics.com
Subject: Re: [patch 2/4] mmu_notifier: Callbacks to invalidate address ranges
Date: Fri, 1 Feb 2008 18:38:52 -0600	[thread overview]
Message-ID: <20080202003852.GB17211@sgi.com> (raw)
In-Reply-To: <20080202002145.GA17211@sgi.com>

On Fri, Feb 01, 2008 at 06:21:45PM -0600, Robin Holt wrote:
> On Fri, Feb 01, 2008 at 04:05:08PM -0800, Christoph Lameter wrote:
> > Are you saying that you get the callback when transitioning from a read 
> > only to a read write pte on the *same* page?
> 
> I believe that is what we saw.  We have not put in any more debug
> information yet.  I will try to squeze it in this weekend.  Otherwise,
> I will probably have to wait until early Monday.

I hate it when I am confused.  I misunderstood what Dean had been saying.
After I looked at his test case and remembering his screen at the time
we were discussing, I am nearly positive that both the parent and child
were still running (no exec, no exit).  We would therefore have two refs
on the page and, yes, be changing the pte which would warrant the callout.
Now I really need to think this through more.  Sounds like a good thing
for Monday.

Thanks,
Robin

WARNING: multiple messages have this Message-ID (diff)
From: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
To: Christoph Lameter <clameter-sJ/iWh9BUns@public.gmane.org>
Cc: Andrea Arcangeli <andrea-atKUWr5tajBWk0Htik3J/w@public.gmane.org>,
	Peter Zijlstra
	<a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>,
	linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
	steiner-sJ/iWh9BUns@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>,
	kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
	daniel.blueman-xqY44rlHlBpWk0Htik3J/w@public.gmane.org,
	Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
Subject: Re: [patch 2/4] mmu_notifier: Callbacks to invalidate address	ranges
Date: Fri, 1 Feb 2008 18:38:52 -0600	[thread overview]
Message-ID: <20080202003852.GB17211@sgi.com> (raw)
In-Reply-To: <20080202002145.GA17211-sJ/iWh9BUns@public.gmane.org>

On Fri, Feb 01, 2008 at 06:21:45PM -0600, Robin Holt wrote:
> On Fri, Feb 01, 2008 at 04:05:08PM -0800, Christoph Lameter wrote:
> > Are you saying that you get the callback when transitioning from a read 
> > only to a read write pte on the *same* page?
> 
> I believe that is what we saw.  We have not put in any more debug
> information yet.  I will try to squeze it in this weekend.  Otherwise,
> I will probably have to wait until early Monday.

I hate it when I am confused.  I misunderstood what Dean had been saying.
After I looked at his test case and remembering his screen at the time
we were discussing, I am nearly positive that both the parent and child
were still running (no exec, no exit).  We would therefore have two refs
on the page and, yes, be changing the pte which would warrant the callout.
Now I really need to think this through more.  Sounds like a good thing
for Monday.

Thanks,
Robin

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WARNING: multiple messages have this Message-ID (diff)
From: Robin Holt <holt@sgi.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: Robin Holt <holt@sgi.com>, Andrea Arcangeli <andrea@qumranet.com>,
	Avi Kivity <avi@qumranet.com>, Izik Eidus <izike@qumranet.com>,
	kvm-devel@lists.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	steiner@sgi.com, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, daniel.blueman@quadrics.com
Subject: Re: [patch 2/4] mmu_notifier: Callbacks to invalidate address ranges
Date: Fri, 1 Feb 2008 18:38:52 -0600	[thread overview]
Message-ID: <20080202003852.GB17211@sgi.com> (raw)
In-Reply-To: <20080202002145.GA17211@sgi.com>

On Fri, Feb 01, 2008 at 06:21:45PM -0600, Robin Holt wrote:
> On Fri, Feb 01, 2008 at 04:05:08PM -0800, Christoph Lameter wrote:
> > Are you saying that you get the callback when transitioning from a read 
> > only to a read write pte on the *same* page?
> 
> I believe that is what we saw.  We have not put in any more debug
> information yet.  I will try to squeze it in this weekend.  Otherwise,
> I will probably have to wait until early Monday.

I hate it when I am confused.  I misunderstood what Dean had been saying.
After I looked at his test case and remembering his screen at the time
we were discussing, I am nearly positive that both the parent and child
were still running (no exec, no exit).  We would therefore have two refs
on the page and, yes, be changing the pte which would warrant the callout.
Now I really need to think this through more.  Sounds like a good thing
for Monday.

Thanks,
Robin

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  reply	other threads:[~2008-02-02  0:39 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-01  5:04 [patch 0/4] [RFC] EMMU Notifiers V5 Christoph Lameter
2008-02-01  5:04 ` Christoph Lameter
2008-02-01  5:04 ` [patch 1/4] mmu_notifier: Core code Christoph Lameter
2008-02-01  5:04   ` Christoph Lameter
2008-02-01 10:55   ` Robin Holt
2008-02-01 10:55     ` Robin Holt
2008-02-01 10:55     ` Robin Holt
2008-02-01 11:04     ` Robin Holt
2008-02-01 11:04       ` Robin Holt
2008-02-01 19:14     ` Christoph Lameter
2008-02-01 19:14       ` Christoph Lameter
2008-02-01 19:14       ` Christoph Lameter
2008-02-01  5:04 ` [patch 2/4] mmu_notifier: Callbacks to invalidate address ranges Christoph Lameter
2008-02-01  5:04   ` Christoph Lameter
2008-02-01 10:49   ` Robin Holt
2008-02-01 10:49     ` Robin Holt
2008-02-01 10:49     ` Robin Holt
2008-02-01 19:14     ` Christoph Lameter
2008-02-01 19:14       ` Christoph Lameter
2008-02-01 19:14       ` Christoph Lameter
2008-02-01 22:09   ` Robin Holt
2008-02-01 22:09     ` Robin Holt
2008-02-01 23:19     ` Christoph Lameter
2008-02-01 23:19       ` Christoph Lameter
2008-02-01 23:35       ` Robin Holt
2008-02-01 23:35         ` Robin Holt
2008-02-01 23:35         ` Robin Holt
2008-02-02  0:05         ` Christoph Lameter
2008-02-02  0:05           ` Christoph Lameter
2008-02-02  0:05           ` Christoph Lameter
2008-02-02  0:21           ` Robin Holt
2008-02-02  0:21             ` Robin Holt
2008-02-02  0:21             ` Robin Holt
2008-02-02  0:38             ` Robin Holt [this message]
2008-02-02  0:38               ` Robin Holt
2008-02-02  0:38               ` Robin Holt
2008-02-03  2:23         ` Andrea Arcangeli
2008-02-03  2:23           ` Andrea Arcangeli
2008-02-03  2:23           ` Andrea Arcangeli
2008-02-01  5:04 ` [patch 3/4] mmu_notifier: invalidate_page callbacks Christoph Lameter
2008-02-01  5:04   ` Christoph Lameter
2008-02-01  5:04 ` [patch 4/4] mmu_notifier: Support for driverws with revers maps (f.e. for XPmem) Christoph Lameter
2008-02-01  5:04   ` Christoph Lameter
2008-02-01 11:58 ` Extending mmu_notifiers to handle __xip_unmap in a sleepable context? Robin Holt
2008-02-01 11:58   ` Robin Holt
2008-02-01 11:58   ` Robin Holt
2008-02-01 12:10   ` Robin Holt
2008-02-01 12:10     ` Robin Holt
2008-02-01 12:10     ` Robin Holt
2008-02-01 19:17   ` Christoph Lameter
2008-02-01 19:17     ` Christoph Lameter
2008-02-01 19:17     ` Christoph Lameter
2008-02-03  1:39 ` [patch 0/4] [RFC] EMMU Notifiers V5 Andrea Arcangeli
2008-02-03  1:39   ` Andrea Arcangeli
2008-02-03 13:41 ` Robin Holt
2008-02-03 13:41   ` Robin Holt
2008-02-03 13:41   ` Robin Holt
  -- strict thread matches above, loose matches on Subject: below --
2008-01-25  5:56 [patch 0/4] [RFC] MMU Notifiers V1 Christoph Lameter
2008-01-25  5:56 ` [patch 2/4] mmu_notifier: Callbacks to invalidate address ranges Christoph Lameter
2008-01-25  5:56   ` Christoph Lameter

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