From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
To: David Hildenbrand <david@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>,
"mhocko@kernel.org" <mhocko@kernel.org>,
"mike.kravetz@oracle.com" <mike.kravetz@oracle.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 02/10] mm,madvise: call soft_offline_page() without MF_COUNT_INCREASED
Date: Thu, 12 Sep 2019 01:37:59 +0000 [thread overview]
Message-ID: <20190912013759.GA4614@hori.linux.bs1.fc.nec.co.jp> (raw)
In-Reply-To: <a2ec3629-3671-cdb4-70e8-2c7e327444e9@redhat.com>
On Wed, Sep 11, 2019 at 12:27:22PM +0200, David Hildenbrand wrote:
> On 10.09.19 12:30, Oscar Salvador wrote:
> > From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> >
> > Currently madvise_inject_error() pins the target via get_user_pages_fast.
> > The call to get_user_pages_fast is only to get the respective page
> > of a given address, but it is the job of the memory-poisoning handler
> > to deal with races, so drop the refcount grabbed by get_user_pages_fast.
> >
>
> Oh, and another question "it is the job of the memory-poisoning handler"
> - is that already properly implemented? (newbee question ¯\_(ツ)_/¯)
The above description might be confusing, sorry. It's intended likes
The call to get_user_pages_fast is only to get the pointer to struct
page of a given address, pinning it is memory-poisoning handler's job,
so drop the refcount grabbed by get_user_pages_fast.
And pinning is done in get_hwpoison_page() for hard-offline and
get_any_page() for soft-offline. For soft-offline case, the semantics of
refcount of poisoned pages is what this patchset tries to change/improve.
Thanks,
Naoya Horiguchi
next prev parent reply other threads:[~2019-09-12 1:39 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-10 10:30 [PATCH 00/10] Hwpoison soft-offline rework Oscar Salvador
2019-09-10 10:30 ` [PATCH 01/10] mm,hwpoison: cleanup unused PageHuge() check Oscar Salvador
2019-09-11 10:17 ` David Hildenbrand
2019-09-10 10:30 ` [PATCH 02/10] mm,madvise: call soft_offline_page() without MF_COUNT_INCREASED Oscar Salvador
2019-09-11 10:23 ` David Hildenbrand
2019-09-12 1:28 ` Naoya Horiguchi
2019-09-11 10:27 ` David Hildenbrand
2019-09-12 1:37 ` Naoya Horiguchi [this message]
2019-09-13 8:37 ` David Hildenbrand
2019-09-10 10:30 ` [PATCH 03/10] mm,hwpoison-inject: don't pin for hwpoison_filter Oscar Salvador
2019-09-16 7:41 ` David Hildenbrand
2019-09-10 10:30 ` [PATCH 04/10] mm,hwpoison: remove MF_COUNT_INCREASED Oscar Salvador
2019-09-11 10:24 ` David Hildenbrand
2019-09-10 10:30 ` [PATCH 05/10] mm: remove flag argument from soft offline functions Oscar Salvador
2019-09-11 10:24 ` David Hildenbrand
2019-09-10 10:30 ` [PATCH 06/10] mm,hwpoison: Unify THP handling for hard and soft offline Oscar Salvador
2019-09-10 10:30 ` [PATCH 07/10] mm,hwpoison: Rework soft offline for in-use pages Oscar Salvador
2019-09-10 10:30 ` [PATCH 08/10] mm,hwpoison: Refactor soft_offline_huge_page and __soft_offline_page Oscar Salvador
2019-09-10 10:30 ` [PATCH 09/10] mm,hwpoison: Rework soft offline for free pages Oscar Salvador
2019-09-10 10:30 ` [PATCH 10/10] mm,hwpoison: Use hugetlb_replace_page to replace free hugetlb pages Oscar Salvador
2019-09-10 10:32 ` [PATCH 00/10] Hwpoison soft-offline rework Oscar Salvador
2019-09-11 5:29 ` Naoya Horiguchi
2019-09-11 6:22 ` Naoya Horiguchi
2019-09-11 6:35 ` osalvador
2019-09-11 7:21 ` Naoya Horiguchi
2019-09-12 13:16 ` Oscar Salvador
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