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Date:   Thu, 13 Apr 2023 17:26:28 +0800
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Subject: Re: [PATCH 1/2] mm: memory-failure: Refactor add_to_kill()
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To:     =?UTF-8?B?SE9SSUdVQ0hJIE5BT1lBKOWggOWPoyDnm7TkuZ8p?= 
        <naoya.horiguchi@nec.com>, Longlong Xia <xialonglong1@huawei.com>
CC:     "akpm@linux-foundation.org" <akpm@linux-foundation.org>,
        "linmiaohe@huawei.com" <linmiaohe@huawei.com>,
        "sunnanyong@huawei.com" <sunnanyong@huawei.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>
References: <20230330074501.205092-1-xialonglong1@huawei.com>
 <20230330074501.205092-2-xialonglong1@huawei.com>
 <20230331054142.GA1435482@hori.linux.bs1.fc.nec.co.jp>
From:   Kefeng Wang <wangkefeng.wang@huawei.com>
In-Reply-To: <20230331054142.GA1435482@hori.linux.bs1.fc.nec.co.jp>
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On 2023/3/31 13:41, HORIGUCHI NAOYA(堀口 直也) wrote:
> On Thu, Mar 30, 2023 at 03:45:00PM +0800, Longlong Xia wrote:
>> The page_address_in_vma() is used to find the user virtual address of page
>> in add_to_kill(), but it doesn't support ksm due to the ksm page->index
>> unusable, add an addr as parameter to add_to_kill(), let's the caller to
>> pass it, also rename the function to __add_to_kill(), and adding
>> add_to_kill_anon_file() for handling anonymous pages and file pages,
>> adding add_to_kill_fsdax() for handling fsdax pages.
>>
>> Signed-off-by: Longlong Xia <xialonglong1@huawei.com>
>> ---
>>   mm/memory-failure.c | 29 +++++++++++++++++++++--------
>>   1 file changed, 21 insertions(+), 8 deletions(-)
>>
>> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
>> index a1ede7bdce95e..9ca058f659121 100644
>> --- a/mm/memory-failure.c
>> +++ b/mm/memory-failure.c
>> @@ -405,9 +405,9 @@ static unsigned long dev_pagemap_mapping_shift(struct vm_area_struct *vma,
>>    * page->mapping are sufficient for mapping the page back to its
>>    * corresponding user virtual address.
>>    */
>> -static void add_to_kill(struct task_struct *tsk, struct page *p,
>> -			pgoff_t fsdax_pgoff, struct vm_area_struct *vma,
>> -			struct list_head *to_kill)
>> +static void __add_to_kill(struct task_struct *tsk, struct page *p,
>> +			  struct vm_area_struct *vma, struct list_head *to_kill,
>> +			  unsigned long addr, pgoff_t fsdax_pgoff)
> 
> Hi, Longlong,
> 
> The new argument addr seems to be used only from add_to_kill_ksm(),
> so you can name the argument as such (like ksm_addr), as we do
> for fsdax_pgoff (which is clear to be used only for fsdax)?
Another option, move page_address_in_vma() from __add_to_kill() into
add_to_kill_[anon_file/fsdax](), but use ksm_addr is fine with me,

Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>


> 
> Thanks,
> Naoya Horiguchi