From: Qian Cai <cai@lca.pw>
To: "HORIGUCHI NAOYA(堀口 直也)" <naoya.horiguchi@nec.com>
Cc: "tony.luck@intel.com" <tony.luck@intel.com>,
"david@redhat.com" <david@redhat.com>,
"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
"zeil@yandex-team.ru" <zeil@yandex-team.ru>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"nao.horiguchi@gmail.com" <nao.horiguchi@gmail.com>,
"mhocko@kernel.org" <mhocko@kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"aneesh.kumar@linux.vnet.ibm.com"
<aneesh.kumar@linux.vnet.ibm.com>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"osalvador@suse.de" <osalvador@suse.de>,
"will@kernel.org" <will@kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"mike.kravetz@oracle.com" <mike.kravetz@oracle.com>
Subject: Re: [PATCH v6 00/12] HWPOISON: soft offline rework
Date: Tue, 11 Aug 2020 13:39:24 -0400 [thread overview]
Message-ID: <20200811173923.GA39857@lca.pw> (raw)
In-Reply-To: <20200811031139.GA7145@hori.linux.bs1.fc.nec.co.jp>
On Tue, Aug 11, 2020 at 03:11:40AM +0000, HORIGUCHI NAOYA(堀口 直也) wrote:
> I'm still not sure why the test succeeded by reverting these because
> current mainline kernel provides similar mechanism to prevent reuse of
> soft offlined page. So this success seems to me something suspicious.
>
> To investigate more, I want to have additional info about the page states
> of the relevant pages after soft offlining. Could you collect it by the
> following steps?
>
> - modify random.c not to run hotplug_memory() in migrate_huge_hotplug_memory(),
> - compile it and run "./random 1" once,
> - to collect page state with hwpoisoned pages, run "./page-types -Nlr -b hwpoison",
> where page-types is available under tools/vm in kernel source tree.
> - choose a few pfns of soft offlined pages from kernel message
> "Soft offlining pfn ...", and run "./page-types -Nlr -a <pfn>".
# ./page-types -Nlr -b hwpoison
offset len flags
99a000 1 __________B________X_______________________
99c000 1 __________B________X_______________________
99e000 1 __________B________X_______________________
9a0000 1 __________B________X_______________________
ba6000 1 __________B________X_______________________
baa000 1 __________B________X_______________________
Every single one of pfns was like this,
# ./page-types -Nlr -a 0x99a000
offset len flags
99a000 1 __________B________X_______________________
# ./page-types -Nlr -a 0x99e000
offset len flags
99e000 1 __________B________X_______________________
# ./page-types -Nlr -a 0x99c000
offset len flags
99c000 1 __________B________X_______________________
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next prev parent reply other threads:[~2020-08-11 17:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200806184923.7007-1-nao.horiguchi@gmail.com>
2020-08-10 15:22 ` [PATCH v6 00/12] HWPOISON: soft offline rework Qian Cai
2020-08-11 3:11 ` HORIGUCHI NAOYA(堀口 直也)
2020-08-11 3:45 ` Qian Cai
2020-08-11 3:56 ` HORIGUCHI NAOYA(堀口 直也)
2020-08-11 17:39 ` Qian Cai [this message]
2020-08-11 19:32 ` Naoya Horiguchi
2020-08-11 22:06 ` Qian Cai
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