From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"aneesh.kumar@linux.vnet.ibm.com"
<aneesh.kumar@linux.vnet.ibm.com>
Subject: Re: [PATCH] mm/madvise: Dont poison entire HugeTLB page for single page errors
Date: Sun, 14 May 2017 08:04:12 +0530 [thread overview]
Message-ID: <dd5e2561-b936-7778-75db-5fe25485bf93@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170512081001.GA13069@hori1.linux.bs1.fc.nec.co.jp>
On 05/12/2017 01:40 PM, Naoya Horiguchi wrote:
> On Thu, Apr 20, 2017 at 04:36:27PM +0530, Anshuman Khandual wrote:
>> Currently soft_offline_page() migrates the entire HugeTLB page, then
>> dequeues it from the active list by making it a dangling HugeTLB page
>> which ofcourse can not be used further and marks the entire HugeTLB
>> page as poisoned. This might be a costly waste of memory if the error
>> involved affects only small section of the entire page.
>>
>> This changes the behaviour so that only the affected page is marked
>> poisoned and then the HugeTLB page is released back to buddy system.
> Hi Anshuman,
>
> This is a good catch, and we can solve this issue now because freeing
> hwpoisoned page (previously forbidden) is available now.
>
> And I'm thinking that the same issue for hard/soft-offline on free
> hugepages can be solved, so I'll submit a patchset which includes
> updated version of your patch.
Sure, thanks Naoya.
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prev parent reply other threads:[~2017-05-14 2:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-19 3:27 [RFC] mm/madvise: Enable (soft|hard) offline of HugeTLB pages at PGD level Anshuman Khandual
2017-04-19 6:20 ` Aneesh Kumar K.V
2017-04-19 6:42 ` Anshuman Khandual
2017-04-20 5:05 ` Anshuman Khandual
2017-04-20 11:06 ` [PATCH] mm/madvise: Dont poison entire HugeTLB page for single page errors Anshuman Khandual
2017-04-20 13:48 ` kbuild test robot
2017-05-12 8:10 ` Naoya Horiguchi
2017-05-14 2:34 ` Anshuman Khandual [this message]
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