From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
To: david@lang.hm
Cc: Christoph Lameter <cl@linux.com>,
Andi Kleen <andi@firstfloor.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Andrew Morton <akpm@google.com>, Dave Jones <davej@redhat.com>,
Mel Gorman <mgorman@suse.de>,
stable@vger.kernel.org, hughd@google.com, sivanich@sgi.com
Subject: Re: [PATCH 0/6] mempolicy memory corruption fixlet
Date: Fri, 1 Jun 2012 15:37:37 -0400 [thread overview]
Message-ID: <CAHGf_=qDy79cvHX3ym7RvkX7q9+2TDKhgtBHVj6+XHORczj94A@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1206011230170.17976@asgard.lang.hm>
>>>>>> Yes, that's right direction, I think. Currently, shmem_set_policy()
>>>>>> can't handle
>>>>>> nonlinear mapping.
>>>>>
>>>>> I've been mulling for some time to just remove non linear mappings.
>>>>> AFAIK they were only useful on 32bit and are obsolete and could be
>>>>> emulated with VMAs instead.
>>>>
>>>>
>>>> I agree. It is only userful on 32bit and current enterprise users don't
>>>> use
>>>> 32bit anymore. So, I don't think emulated by vmas cause user visible
>>>> issue.
>>>
>>>
>>> I wish this was true, there are a lot of systems out there still running
>>> 32
>>> bit linux, even on 64 bit capible hardware. This is especially true in
>>> enterprises where they have either homegrown or proprietary software that
>>> isn't 64 bit clean.
>>
>> 32 bit binaries (and entire distros) run fine under 64 bit kernels.
>
> unfortunantly, not quite 100% of the time. It's very good, but the automount
> bug a month or so ago is an example of how you can run into rare problems.
> Many "enterprise" systems are not willing to risk it.
Then we can remove a feature safely. Risk not taker continue to uses old distro
kernel. And some years after, distros discontinue to support 32bit. And then,
problem will vanish automatically.
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next prev parent reply other threads:[~2012-06-01 19:37 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
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 19:17 ` Christoph Lameter
2012-05-30 19:39 ` KOSAKI Motohiro
2012-05-30 19:44 ` Christoph Lameter
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 19:41 ` Christoph Lameter
2012-05-30 19:46 ` KOSAKI Motohiro
2012-05-30 19:48 ` Andi Kleen
2012-05-30 20:31 ` Andi Kleen
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 ` [PATCH 4/6] mempolicy: fix refcount leak in mpol_set_shared_policy() 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 20:37 ` Andi Kleen
2012-05-30 9:02 ` [PATCH 6/6] MAINTAINERS: Added MEMPOLICY entry kosaki.motohiro
2012-05-30 19:27 ` Christoph Lameter
2012-05-30 18:26 ` [PATCH 0/6] mempolicy memory corruption fixlet Linus Torvalds
2012-05-30 18:34 ` Christoph Lameter
2012-05-30 18:46 ` Andi Kleen
2012-05-30 18:50 ` Christoph Lameter
2012-05-30 19:32 ` Andi Kleen
2012-05-30 19:42 ` Christoph Lameter
2012-05-30 19:52 ` Andi Kleen
2012-05-30 20:00 ` KOSAKI Motohiro
2012-05-30 21:22 ` Ben Hutchings
2012-05-30 21:25 ` KOSAKI Motohiro
2012-05-30 19:54 ` KOSAKI Motohiro
2012-05-30 20:10 ` Andi Kleen
2012-05-30 20:16 ` KOSAKI Motohiro
2012-06-01 0:45 ` david
2012-06-01 13:51 ` Christoph Lameter
2012-06-01 19:31 ` david
2012-06-01 19:37 ` KOSAKI Motohiro [this message]
2012-06-05 19:02 ` Linus Torvalds
2012-06-05 19:17 ` Andrew Morton
2012-06-06 19:10 ` KOSAKI Motohiro
2012-05-30 19:03 ` Linus Torvalds
2012-05-30 20:10 ` KOSAKI Motohiro
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