From: Michal Hocko <mhocko@suse.cz>
To: Larry Woodman <lwoodman@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>,
Hugh Dickins <hughd@google.com>, Linux-MM <linux-mm@kvack.org>,
David Gibson <david@gibson.dropbear.id.au>,
Ken Chen <kenchen@google.com>,
Cong Wang <xiyou.wangcong@gmail.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -alternative] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables V2 (resend)
Date: Wed, 1 Aug 2012 10:20:36 +0200 [thread overview]
Message-ID: <20120801082036.GC4436@tiehlicka.suse.cz> (raw)
In-Reply-To: <50189857.4000501@redhat.com>
On Tue 31-07-12 22:45:43, Larry Woodman wrote:
> On 07/31/2012 04:06 PM, Michal Hocko wrote:
> >On Tue 31-07-12 13:49:21, Larry Woodman wrote:
> >>On 07/31/2012 08:46 AM, Mel Gorman wrote:
> >>>Fundamentally I think the problem is that we are not correctly detecting
> >>>that page table sharing took place during huge_pte_alloc(). This patch is
> >>>longer and makes an API change but if I'm right, it addresses the underlying
> >>>problem. The first VM_MAYSHARE patch is still necessary but would you mind
> >>>testing this on top please?
> >>Hi Mel, yes this does work just fine. It ran for hours without a panic so
> >>I'll Ack this one if you send it to the list.
> >Hi Larry, thanks for testing! I have a different patch which tries to
> >address this very same issue. I am not saying it is better or that it
> >should be merged instead of Mel's one but I would be really happy if you
> >could give it a try. We can discuss (dis)advantages of both approaches
> >later.
> >
> >Thanks!
>
> Hi Michal, the system hung when I tested this patch on top of the
> latest 3.5 kernel. I wont have AltSysrq access to the system until
> tomorrow AM.
Please hold on. The patch is crap. I forgot about
if (!vma_shareable(vma, addr))
return;
case so somebody got an uninitialized pmd. The patch bellow handles
that.
Sorry about that and thanks to Mel to notice this.
---
next prev parent reply other threads:[~2012-08-01 8:20 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-20 13:49 [PATCH] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables v2 Mel Gorman
2012-07-20 14:11 ` [PATCH] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables V2 (resend) Mel Gorman
2012-07-20 14:29 ` Michal Hocko
2012-07-20 14:37 ` Mel Gorman
2012-07-20 14:40 ` Michal Hocko
2012-07-20 14:36 ` [PATCH -alternative] " Michal Hocko
2012-07-20 14:51 ` Mel Gorman
2012-07-23 4:04 ` Hugh Dickins
2012-07-23 11:40 ` Mel Gorman
2012-07-24 1:08 ` Hugh Dickins
2012-07-24 8:32 ` Michal Hocko
2012-07-24 9:34 ` Mel Gorman
2012-07-24 10:04 ` Michal Hocko
2012-07-24 19:23 ` Hugh Dickins
2012-07-25 8:36 ` Mel Gorman
2012-07-26 17:42 ` Rik van Riel
2012-07-26 18:04 ` Larry Woodman
2012-07-27 8:42 ` Mel Gorman
2012-07-26 18:37 ` Rik van Riel
2012-07-26 21:03 ` Larry Woodman
2012-07-27 3:48 ` Larry Woodman
2012-07-27 10:10 ` Larry Woodman
2012-07-27 10:23 ` Mel Gorman
2012-07-27 10:36 ` Larry Woodman
2012-07-30 19:11 ` Larry Woodman
2012-07-31 12:16 ` Hillf Danton
2012-07-31 12:46 ` Mel Gorman
2012-07-31 13:07 ` Larry Woodman
2012-07-31 13:29 ` Mel Gorman
2012-07-31 13:21 ` Michal Hocko
2012-07-31 17:49 ` Larry Woodman
2012-07-31 20:06 ` Michal Hocko
2012-07-31 20:57 ` Larry Woodman
2012-08-01 2:45 ` Larry Woodman
2012-08-01 8:20 ` Michal Hocko [this message]
2012-08-01 12:32 ` Michal Hocko
2012-08-01 15:06 ` Larry Woodman
2012-08-02 7:19 ` Michal Hocko
2012-08-02 7:37 ` Mel Gorman
2012-08-02 12:36 ` Michal Hocko
2012-08-02 13:33 ` Mel Gorman
2012-08-02 13:53 ` Michal Hocko
2012-07-31 18:03 ` Rik van Riel
2012-07-26 18:31 ` Rik van Riel
2012-07-27 9:02 ` Michal Hocko
2012-07-26 16:01 ` [PATCH] mm: hugetlbfs: Close race during teardown of hugetlbfs shared page tables v2 Larry Woodman
2012-07-27 8:47 ` Mel Gorman
2012-07-26 21:00 ` Rik van Riel
2012-07-26 21:54 ` Hugh Dickins
2012-07-27 8:52 ` Mel Gorman
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