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From: David Hildenbrand <david@redhat.com>
To: Kazuhito Hagio <k-hagio@ab.jp.nec.com>
Cc: "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
	"pv-drivers@vmware.com" <pv-drivers@vmware.com>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	kexec-ml <kexec@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"devel@linuxdriverproject.org" <devel@linuxdriverproject.org>
Subject: Re: [PATCH v2] makedumpfile: exclude pages that are logically offline
Date: Thu, 7 Mar 2019 09:41:15 +0100	[thread overview]
Message-ID: <7c9d6d5c-d6cf-00a7-7f23-bf28cbb382af__10858.7117561669$1551948135$gmane$org@redhat.com> (raw)
In-Reply-To: <4AE2DC15AC0B8543882A74EA0D43DBEC03561800@BPXM09GP.gisp.nec.co.jp>

On 27.11.18 17:32, Kazuhito Hagio wrote:
>> Linux marks pages that are logically offline via a page flag (map count).
>> Such pages e.g. include pages infated as part of a balloon driver or
>> pages that were not actually onlined when onlining the whole section.
>>
>> While the hypervisor usually allows to read such inflated memory, we
>> basically read and dump data that is completely irrelevant. Also, this
>> might result in quite some overhead in the hypervisor. In addition,
>> we saw some problems under Hyper-V, whereby we can crash the kernel by
>> dumping, when reading memory of a partially onlined memory segment
>> (for memory added by the Hyper-V balloon driver).
>>
>> Therefore, don't read and dump pages that are marked as being logically
>> offline.
>>
>> Signed-off-by: David Hildenbrand <david@redhat.com>
> 
> Thanks for the v2 update.
> I'm going to merge this patch after the kernel patches are merged
> and it tests fine with the kernel.
> 
> Kazu

Hi Kazu,

the patches are now upstream. Thanks!

-- 

Thanks,

David / dhildenb

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  reply	other threads:[~2019-03-07  8:41 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-22 10:06 [PATCH v2 0/8] mm/kdump: allow to exclude pages that are logically offline David Hildenbrand
2018-11-22 10:06 ` David Hildenbrand
2018-11-22 10:06 ` David Hildenbrand
2018-11-22 10:06 ` [PATCH v2 1/8] mm: balloon: update comment about isolation/migration/compaction David Hildenbrand
2018-11-22 10:06   ` David Hildenbrand
2018-11-22 10:06 ` David Hildenbrand
2018-11-22 10:06 ` [PATCH v2 2/8] mm: convert PG_balloon to PG_offline David Hildenbrand
2018-11-22 10:06   ` David Hildenbrand
2018-11-22 10:06   ` David Hildenbrand
2018-11-22 10:06 ` David Hildenbrand
2018-11-22 10:06 ` [PATCH v2 3/8] kexec: export PG_offline to VMCOREINFO David Hildenbrand
2018-11-22 10:06   ` David Hildenbrand
2018-11-22 10:06   ` David Hildenbrand
2019-03-11  9:04   ` Dave Young
2019-03-11  9:04   ` Dave Young
2019-03-11  9:04     ` Dave Young
2019-03-11  9:55     ` David Hildenbrand
2019-03-11  9:55     ` David Hildenbrand
2019-03-11  9:55       ` David Hildenbrand
2019-03-11 10:04       ` Dave Young
2019-03-11 10:04         ` Dave Young
2019-03-11 10:04       ` Dave Young
2018-11-22 10:06 ` David Hildenbrand
2018-11-22 10:06 ` [PATCH v2 4/8] xen/balloon: mark inflated pages PG_offline David Hildenbrand
2018-11-22 10:06   ` David Hildenbrand
2018-11-23 13:41   ` Juergen Gross
2018-11-23 13:41   ` Juergen Gross
2018-11-23 13:41     ` Juergen Gross
2018-11-23 13:41     ` Juergen Gross
2018-11-22 10:06 ` David Hildenbrand
2018-11-22 10:06 ` [PATCH v2 5/8] hv_balloon: " David Hildenbrand
2018-11-22 10:06   ` David Hildenbrand
2018-11-22 10:06 ` David Hildenbrand
2018-11-22 10:06 ` [PATCH v2 6/8] vmw_balloon: " David Hildenbrand
2018-11-22 10:06 ` David Hildenbrand
2018-11-22 10:06   ` David Hildenbrand
2018-11-22 10:06 ` [PATCH v2 7/8] PM / Hibernate: use pfn_to_online_page() David Hildenbrand
2018-11-22 10:06 ` David Hildenbrand
2018-11-22 10:06   ` David Hildenbrand
2018-11-22 10:06 ` [PATCH v2 8/8] PM / Hibernate: exclude all PageOffline() pages David Hildenbrand
2018-11-22 10:06   ` David Hildenbrand
2018-11-22 10:06 ` David Hildenbrand
2018-11-22 10:09 ` [PATCH v2] makedumpfile: exclude pages that are logically offline David Hildenbrand
2018-11-22 10:09 ` David Hildenbrand
2018-11-22 10:09   ` David Hildenbrand
2018-11-27 16:32   ` Kazuhito Hagio
2018-11-27 16:32     ` Kazuhito Hagio
2018-11-27 16:32     ` Kazuhito Hagio
2019-03-07  8:41     ` David Hildenbrand [this message]
2019-03-07  8:41     ` David Hildenbrand
2019-03-07  8:41       ` David Hildenbrand
2019-03-11 16:40       ` Kazuhito Hagio
2019-03-11 16:40         ` Kazuhito Hagio
2019-03-11 16:40       ` Kazuhito Hagio
2018-11-27 16:32   ` Kazuhito Hagio
2019-02-27  5:32 ` [PATCH v2 0/8] mm/kdump: allow to " Dave Young
2019-02-27  5:32   ` Dave Young
2019-02-27  5:32   ` Dave Young
2019-02-28 19:45   ` Andrew Morton
2019-02-28 19:45   ` Andrew Morton
2019-02-28 19:45     ` Andrew Morton
2019-02-28 19:45     ` Andrew Morton
2019-02-28 19:54     ` Boris Ostrovsky
2019-02-28 19:54     ` Boris Ostrovsky
2019-02-28 19:54       ` Boris Ostrovsky
2019-02-28 19:54       ` Boris Ostrovsky
2019-03-04  6:21     ` Dave Young
2019-03-04  6:21     ` Dave Young
2019-03-04  6:21       ` Dave Young
2019-03-04  6:21       ` Dave Young
2019-03-04  7:14       ` Juergen Gross
     [not found]       ` <20190304062118.GA31037-0VdLhd/A9Pl+NNSt+8eSiB/sF2h8X+2i0E9HWUfgJXw@public.gmane.org>
2019-03-04  7:14         ` Juergen Gross
2019-03-04  7:14           ` Juergen Gross
2019-03-04  7:14           ` Juergen Gross
2019-02-27  5:32 ` Dave Young

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