linux-kernel - Re: [PATCH 1/2] mm: page_alloc: simplify pageblock migratetype check in __free_one

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Date:   Mon, 4 Apr 2022 10:43:35 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     Zi Yan <ziy@...dia.com>, linux-mm@...ck.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Rapoport <rppt@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mm: page_alloc: simplify pageblock migratetype check
 in __free_one_page().

On 02.04.22 09:52, Kalle Valo wrote:
> Kalle Valo <kvalo@...nel.org> writes:
> 
>> David Hildenbrand <david@...hat.com> writes:
>>
>>> On 01.04.22 16:22, David Hildenbrand wrote:
>>>> On 01.04.22 16:19, Zi Yan wrote:
>>>>> On 1 Apr 2022, at 10:12, David Hildenbrand wrote:
>>>>>
>>>>>> On 01.04.22 15:58, Zi Yan wrote:
>>>>>>
>>>>>> It's weird, your mails arrive on my end as empty body with attachment. I
>>>>>> first suspected Thunderbird, but I get the same result on the google
>>>>>> mail web client.
>>>>>>
>>>>>> Not sure why that happens.
>>>>>
>>>>> No idea. They look fine (except mangled links by outlook) on my outlook
>>>>> desk client and web client on my side. lore looks OK too:
>>>>> https://lore.kernel.org/linux-mm/20220401135820.1453829-1-zi.yan@sent.com/
>>>>
>>>> I can spot in the raw mail I receive
>>>>
>>>> "Content-Type: application/octet-stream; x-default=true"
>>>>
>>>> But that seems to differ to the lore mail:
>>>>
>>>> https://lore.kernel.org/linux-mm/20220401135820.1453829-1-zi.yan@sent.com/raw
>>>>
>>>>
>>>> Maybe something in my mail server chain decides to do some nasty
>>>> conversion (grml, wouldn't be the first time)
>>>>
>>>
>>> Weird thing is that this only happens with your mails. I opened an
>>> internal ticket, sorry for the noise.
>>
>> Zi's patch emails I received didn't have Content-Type, that might have
>> something to do with this. (But his reply later in the thread did have
>> one.) Also last week I got one patch email with no Content-Type either
>> and my Gnus decided to convert it to octet-stream, I guess to be on the
>> safe side. No idea if something similar is happening to you, but wanted
>> to mention it anyway.
> 
> Just to clarify, I assumed Gnus was doing the conversion to octet-stream
> but I never verified that.
> 
> Heh, interestingly enough that patch was sent from redhat.com:
> 
> https://lore.kernel.org/all/877d8eyz61.fsf@kernel.org/
> 
> Is that just a coincidence or are Redhat servers doing something
> strange? If you find out, do let me know. I'm very curious :)
> 

It is strange. Also mails from Andrew result in the same,
unusable/unreadable mails in my inbox. :(

Right now I assume that Mimecast servers try to auto-detecting and
adding "Content-type:", and somehow mess up. And I do think that it
doesn't always mess up; some patch content (encoding?) seems to trigger
that.


-- 
Thanks,

David / dhildenb