From: Andi Kleen <andi@firstfloor.org>
To: Christoph Lameter <cl@linux.com>
Cc: kosaki.motohiro@gmail.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Andrew Morton <akpm@google.com>,
Dave Jones <davej@redhat.com>, Mel Gorman <mgorman@suse.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
stable@vger.kernel.org, hughd@google.com,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
andi@firstfloor.org
Subject: Re: [PATCH 2/6] mempolicy: Kill all mempolicy sharing
Date: Wed, 30 May 2012 21:48:59 +0200 [thread overview]
Message-ID: <20120530194858.GW27374@one.firstfloor.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1205301439410.31768@router.home>
On Wed, May 30, 2012 at 02:41:22PM -0500, Christoph Lameter wrote:
> On Wed, 30 May 2012, kosaki.motohiro@gmail.com wrote:
>
> > refcount will be decreased even though was not increased whenever alloc_page_vma()
> > is called. As you know, mere mbind(MPOL_MF_MOVE) calls alloc_page_vma().
>
> Most of these issues are about memory migration and shared memory. If we
> exempt shared memory from memory migration (after all that shared memory
> has its own distinct memory policies already!) then a lot of these issues
> wont arise.
Soft memory offlining needs migration. It's fairly important that this
works: on the database systems most memory is in shared memory and they
have a lot of memory, so predictive failure analysis and soft offlining
helps a lot.
Classic migration is probably not too important here, but they pretty
much rely on the same low level mechanism.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
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WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <andi@firstfloor.org>
To: Christoph Lameter <cl@linux.com>
Cc: kosaki.motohiro@gmail.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Andrew Morton <akpm@google.com>,
Dave Jones <davej@redhat.com>, Mel Gorman <mgorman@suse.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
stable@vger.kernel.org, hughd@google.com,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
andi@firstfloor.org
Subject: Re: [PATCH 2/6] mempolicy: Kill all mempolicy sharing
Date: Wed, 30 May 2012 21:48:59 +0200 [thread overview]
Message-ID: <20120530194858.GW27374@one.firstfloor.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1205301439410.31768@router.home>
On Wed, May 30, 2012 at 02:41:22PM -0500, Christoph Lameter wrote:
> On Wed, 30 May 2012, kosaki.motohiro@gmail.com wrote:
>
> > refcount will be decreased even though was not increased whenever alloc_page_vma()
> > is called. As you know, mere mbind(MPOL_MF_MOVE) calls alloc_page_vma().
>
> Most of these issues are about memory migration and shared memory. If we
> exempt shared memory from memory migration (after all that shared memory
> has its own distinct memory policies already!) then a lot of these issues
> wont arise.
Soft memory offlining needs migration. It's fairly important that this
works: on the database systems most memory is in shared memory and they
have a lot of memory, so predictive failure analysis and soft offlining
helps a lot.
Classic migration is probably not too important here, but they pretty
much rely on the same low level mechanism.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2012-05-30 19:49 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-30 9:02 [PATCH 0/6] mempolicy memory corruption fixlet kosaki.motohiro
2012-05-30 9:02 ` kosaki.motohiro
2012-05-30 9:02 ` [PATCH 1/6] Revert "mm: mempolicy: Let vma_merge and vma_split handle vma->vm_policy linkages" kosaki.motohiro
2012-05-30 9:02 ` kosaki.motohiro
2012-05-30 19:17 ` Christoph Lameter
2012-05-30 19:17 ` Christoph Lameter
2012-05-30 19:39 ` KOSAKI Motohiro
2012-05-30 19:39 ` KOSAKI Motohiro
2012-05-30 19:39 ` KOSAKI Motohiro
2012-05-30 19:44 ` Christoph Lameter
2012-05-30 19:44 ` Christoph Lameter
2012-05-31 6:49 ` KOSAKI Motohiro
2012-05-31 6:49 ` KOSAKI Motohiro
2012-05-30 9:02 ` [PATCH 2/6] mempolicy: Kill all mempolicy sharing kosaki.motohiro
2012-05-30 9:02 ` kosaki.motohiro
2012-05-30 19:41 ` Christoph Lameter
2012-05-30 19:41 ` Christoph Lameter
2012-05-30 19:46 ` KOSAKI Motohiro
2012-05-30 19:46 ` KOSAKI Motohiro
2012-05-30 19:48 ` Andi Kleen [this message]
2012-05-30 19:48 ` Andi Kleen
2012-05-30 20:31 ` Andi Kleen
2012-05-30 20:31 ` Andi Kleen
2012-05-30 20:58 ` KOSAKI Motohiro
2012-05-30 20:58 ` KOSAKI Motohiro
2012-05-30 9:02 ` [PATCH 3/6] mempolicy: fix a race in shared_policy_replace() kosaki.motohiro
2012-05-30 9:02 ` kosaki.motohiro
2012-05-30 9:02 ` [PATCH 4/6] mempolicy: fix refcount leak in mpol_set_shared_policy() kosaki.motohiro
2012-05-30 9:02 ` kosaki.motohiro
2012-05-30 9:02 ` [PATCH 5/6] mempolicy: fix a memory corruption by refcount imbalance in alloc_pages_vma() kosaki.motohiro
2012-05-30 9:02 ` kosaki.motohiro
2012-05-30 20:37 ` Andi Kleen
2012-05-30 20:37 ` Andi Kleen
2012-05-30 9:02 ` [PATCH 6/6] MAINTAINERS: Added MEMPOLICY entry kosaki.motohiro
2012-05-30 9:02 ` kosaki.motohiro
2012-05-30 19:27 ` Christoph Lameter
2012-05-30 19:27 ` Christoph Lameter
2012-05-30 18:26 ` [PATCH 0/6] mempolicy memory corruption fixlet Linus Torvalds
2012-05-30 18:26 ` Linus Torvalds
2012-05-30 18:34 ` Christoph Lameter
2012-05-30 18:34 ` Christoph Lameter
2012-05-30 18:46 ` Andi Kleen
2012-05-30 18:46 ` Andi Kleen
2012-05-30 18:50 ` Christoph Lameter
2012-05-30 18:50 ` Christoph Lameter
2012-05-30 19:32 ` Andi Kleen
2012-05-30 19:32 ` Andi Kleen
2012-05-30 19:42 ` Christoph Lameter
2012-05-30 19:42 ` Christoph Lameter
2012-05-30 19:52 ` Andi Kleen
2012-05-30 19:52 ` Andi Kleen
2012-05-30 20:00 ` KOSAKI Motohiro
2012-05-30 20:00 ` KOSAKI Motohiro
2012-05-30 21:22 ` Ben Hutchings
2012-05-30 21:22 ` Ben Hutchings
2012-05-30 21:25 ` KOSAKI Motohiro
2012-05-30 21:25 ` KOSAKI Motohiro
2012-05-30 19:54 ` KOSAKI Motohiro
2012-05-30 19:54 ` KOSAKI Motohiro
2012-05-30 20:10 ` Andi Kleen
2012-05-30 20:10 ` Andi Kleen
2012-05-30 20:16 ` KOSAKI Motohiro
2012-05-30 20:16 ` KOSAKI Motohiro
2012-06-01 0:45 ` david
2012-06-01 0:45 ` david
2012-06-01 13:51 ` Christoph Lameter
2012-06-01 13:51 ` Christoph Lameter
2012-06-01 19:31 ` david
2012-06-01 19:31 ` david
2012-06-01 19:37 ` KOSAKI Motohiro
2012-06-01 19:37 ` KOSAKI Motohiro
2012-06-05 19:02 ` Linus Torvalds
2012-06-05 19:02 ` Linus Torvalds
2012-06-05 19:17 ` Andrew Morton
2012-06-05 19:17 ` Andrew Morton
2012-06-06 19:10 ` KOSAKI Motohiro
2012-06-06 19:10 ` KOSAKI Motohiro
2012-05-30 19:03 ` Linus Torvalds
2012-05-30 19:03 ` Linus Torvalds
2012-05-30 20:10 ` KOSAKI Motohiro
2012-05-30 20:10 ` KOSAKI Motohiro
2012-05-30 20:10 ` KOSAKI Motohiro
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