From: Hugh Dickins <hugh@veritas.com>
To: Izik Eidus <ieidus@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Rik van Riel <riel@redhat.com>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
chrisw@redhat.com, alan@lxorguk.ukuu.org.uk, device@lanana.org,
linux-mm@kvack.org, nickpiggin@yahoo.com.au
Subject: Re: [PATCH 2/6] ksm: dont allow overlap memory addresses registrations.
Date: Wed, 6 May 2009 18:11:13 +0100 (BST) [thread overview]
Message-ID: <Pine.LNX.4.64.0905061810320.8344@blonde.anvils> (raw)
In-Reply-To: <4A01987A.6070002@redhat.com>
On Wed, 6 May 2009, Izik Eidus wrote:
> Hugh Dickins wrote:
> >
> > There may prove to be various reasons why it wouldn't work out in practice;
> > but when thinking of swapping them, it is worth considering if those KSM
> > pages can just be assigned to a tmpfs file, then leave the swapping to that.
>
> The problem here (as i see it) is reverse mapping for this vmas that point
> into the shared page.
> Right now linux use the ->index to find this pages and then unpresent them...
> But even if we move into allocating them inside tmpfs, who will know how to
> unpresent the virtual addresses when we want to swap the page?
Yes, you're right, tmpfs wouldn't be helping you at all with that problem,
so doubtful whether it has any help to offer here.
Hugh
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next prev parent reply other threads:[~2009-05-06 17:11 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-04 22:25 [PATCH 0/6] ksm changes (v2) Izik Eidus
2009-05-04 22:25 ` [PATCH 1/6] ksm: limiting the num of mem regions user can register per fd Izik Eidus
2009-05-04 22:25 ` [PATCH 2/6] ksm: dont allow overlap memory addresses registrations Izik Eidus
2009-05-04 22:25 ` [PATCH 3/6] ksm: change the KSM_REMOVE_MEMORY_REGION ioctl Izik Eidus
2009-05-04 22:25 ` [PATCH 4/6] ksm: change the prot handling to use the generic helper functions Izik Eidus
2009-05-04 22:25 ` [PATCH 5/6] ksm: build system make it compile for all archs Izik Eidus
2009-05-04 22:25 ` [PATCH 6/6] ksm: use another miscdevice minor number Izik Eidus
2009-05-06 0:55 ` Rik van Riel
2009-05-06 0:54 ` [PATCH 5/6] ksm: build system make it compile for all archs Rik van Riel
2009-05-06 0:54 ` [PATCH 4/6] ksm: change the prot handling to use the generic helper functions Rik van Riel
2009-05-06 0:53 ` [PATCH 3/6] ksm: change the KSM_REMOVE_MEMORY_REGION ioctl Rik van Riel
2009-05-06 8:38 ` Izik Eidus
2009-05-06 11:16 ` Hugh Dickins
2009-05-06 13:34 ` Andrea Arcangeli
2009-05-06 13:56 ` Izik Eidus
2009-05-06 16:41 ` Hugh Dickins
2009-05-06 16:49 ` Chris Wright
2009-05-06 16:57 ` Hugh Dickins
2009-05-06 17:47 ` Andrea Arcangeli
2009-05-06 16:59 ` Izik Eidus
2009-05-07 11:31 ` Andrea Arcangeli
2009-05-07 13:13 ` Hugh Dickins
2009-05-07 13:23 ` Andrea Arcangeli
2009-05-06 14:25 ` Hugh Dickins
2009-05-06 14:45 ` Andrea Arcangeli
2009-05-06 15:36 ` Chris Wright
2009-05-06 15:27 ` Izik Eidus
2009-05-06 16:14 ` Chris Wright
2009-05-06 16:36 ` Hugh Dickins
2009-05-06 17:09 ` Chris Wright
2009-05-06 17:54 ` Hugh Dickins
2009-05-06 16:26 ` Hugh Dickins
2009-05-06 16:58 ` Izik Eidus
2009-05-06 23:59 ` Chris Wright
2009-05-07 2:41 ` Rik van Riel
2009-05-06 0:43 ` [PATCH 2/6] ksm: dont allow overlap memory addresses registrations Rik van Riel
2009-05-06 9:46 ` Izik Eidus
2009-05-06 12:26 ` Rik van Riel
2009-05-06 12:39 ` Izik Eidus
2009-05-06 13:17 ` Andrea Arcangeli
2009-05-06 13:28 ` Hugh Dickins
2009-05-06 14:02 ` Izik Eidus
2009-05-06 17:11 ` Hugh Dickins [this message]
2009-05-06 14:09 ` Andrea Arcangeli
2009-05-06 14:21 ` Alan Cox
2009-05-06 14:46 ` Hugh Dickins
2009-05-06 14:56 ` Andrea Arcangeli
2009-05-06 23:55 ` Minchan Kim
2009-05-07 0:19 ` Chris Wright
2009-05-07 10:46 ` Andrea Arcangeli
2009-05-07 12:01 ` Minchan Kim
2009-05-06 14:57 ` Izik Eidus
2009-05-06 0:40 ` [PATCH 1/6] ksm: limiting the num of mem regions user can register per fd Rik van Riel
-- strict thread matches above, loose matches on Subject: below --
2009-05-02 22:16 [PATCH 0/6] ksm changes Izik Eidus
2009-05-02 22:16 ` [PATCH 1/6] ksm: limiting the num of mem regions user can register per fd Izik Eidus
2009-05-02 22:16 ` [PATCH 2/6] ksm: dont allow overlap memory addresses registrations Izik Eidus
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