From: David Hildenbrand <david@redhat.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.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: Fri, 13 Sep 2019 10:37:46 +0200 [thread overview]
Message-ID: <2edff784-c5e7-ec1e-025d-45e4164e2a46@redhat.com> (raw)
In-Reply-To: <20190912013759.GA4614@hori.linux.bs1.fc.nec.co.jp>
On 12.09.19 03:37, Naoya Horiguchi wrote:
> 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 for the clarification!
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2019-09-13 8:37 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
2019-09-13 8:37 ` David Hildenbrand [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=2edff784-c5e7-ec1e-025d-45e4164e2a46@redhat.com \
--to=david@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@kernel.org \
--cc=mike.kravetz@oracle.com \
--cc=n-horiguchi@ah.jp.nec.com \
--cc=osalvador@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).