linux-kernel - Re: [PATCH 2/3] mm/madvise: Add MF_ACTION_REQUIRED to madvise(MADV

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Date: Sun, 5 May 2024 15:02:43 +0800
From: Miaohe Lin <linmiaohe@...wei.com>
To: Jane Chu <jane.chu@...cle.com>, <nao.horiguchi@...il.com>,
	<akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] mm/madvise: Add MF_ACTION_REQUIRED to
 madvise(MADV_HWPOISON)

On 2024/5/2 7:24, Jane Chu wrote:
> The soft hwpoison injector via madvise(MADV_HWPOISON) operates in
> a synchrous way in a sense, the injector is also a process under
> test, and should it have the poisoned page mapped in its address
> space, it should legitimately get killed as much as in a real UE
> situation.

Will it be better to add a method to set MF_ACTION_REQUIRED explicitly when inject soft hwpoison?
Thanks.
.

> 
> Signed-off-by: Jane Chu <jane.chu@...cle.com>
> ---
>  mm/madvise.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/madvise.c b/mm/madvise.c
> index 1a073fcc4c0c..eaeae5252c02 100644
> --- a/mm/madvise.c
> +++ b/mm/madvise.c
> @@ -1127,7 +1127,7 @@ static int madvise_inject_error(int behavior,
>  		} else {
>  			pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n",
>  				 pfn, start);
> -			ret = memory_failure(pfn, MF_COUNT_INCREASED | MF_SW_SIMULATED);
> +			ret = memory_failure(pfn, MF_ACTION_REQUIRED | MF_COUNT_INCREASED | MF_SW_SIMULATED);
>  			if (ret == -EOPNOTSUPP)
>  				ret = 0;
>  		}
>