linux-kernel - Re: [PATCH v4 1/2] mm/memory-failure: introduce "hwpoisoned-pages" entry

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Message-ID: <66c43dac-32ac-5801-c76c-01607d68e38b@redhat.com>
Date:   Tue, 14 Jun 2022 09:13:16 +0200
From:   David Hildenbrand <david@...hat.com>
To:     HORIGUCHI NAOYA(堀口 直也) 
        <naoya.horiguchi@....com>, zhenwei pi <pizhenwei@...edance.com>
Cc:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linmiaohe@...wei.com" <linmiaohe@...wei.com>
Subject: Re: [PATCH v4 1/2] mm/memory-failure: introduce "hwpoisoned-pages"
 entry

	   &hwpoisoned_pages);
> 
> I'm not sure how useful this interface from userspace (controlling test process
> with this?).  Do we really need to expose this to userspace? 
> 
> 
> TBH I feel that another approach like below is more desirable:
> 
>   - define a new flag in "enum mf_flags" (for example named MF_SW_SIMULATED),
>   - set the flag when calling memory_failure() from the three callers
>     mentioned above,
>   - define a global variable (typed bool) in mm/memory_failure.c_to show that
>     the system has experienced a real hardware memory error events.
>   - once memory_failure() is called without MF_SW_SIMULATED, the new global
>     bool variable is set, and afterward unpoison_memory always fails with
>     -EOPNOTSUPP.

Exactly what I had in mind.

-- 
Thanks,

David / dhildenb