linux-kernel - Re: [PATCH 02/10] mm,madvise: call soft_offline_page() without MF_COUNT

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Message-ID: <a2ec3629-3671-cdb4-70e8-2c7e327444e9@redhat.com>
Date:   Wed, 11 Sep 2019 12:27:22 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Oscar Salvador <osalvador@...e.de>, n-horiguchi@...jp.nec.com
Cc:     mhocko@...nel.org, mike.kravetz@...cle.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/10] mm,madvise: call soft_offline_page() without
 MF_COUNT_INCREASED

On 10.09.19 12:30, Oscar Salvador wrote:
> From: Naoya Horiguchi <n-horiguchi@...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)_/¯)

-- 

Thanks,

David / dhildenb