linux-kernel - Re: 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card

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Date:   Tue, 3 Oct 2017 09:27:30 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Pavel Machek <pavel@....cz>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        linux-mm@...ck.org
Subject: Re: 4.14-rc2 on thinkpad x220: out of memory when inserting mmc card

On 02/10/17 16:03, Pavel Machek wrote:
> On Mon 2017-10-02 14:06:03, Linus Walleij wrote:
>> On Mon, Oct 2, 2017 at 10:41 AM, Pavel Machek <pavel@....cz> wrote:
>>
>>>> Bounce buffers are being removed from v4.15
>>
>> As Adrian states, this would make any last bugs go away. I would
>> even consider putting this patch this into fixes if it solves the problem.
>>
>>> although you may experience
>>>> performance regression with that:
>>>>
>>>>       https://marc.info/?l=linux-mmc&m=150589778700551
>>>
>>> Hmm. The performance of this is already pretty bad, I really hope it
>>> does not get any worse.
>>
>> Did you use bounce buffers? Those were improving performance on
>> some laptops with TI or Ricoh host controllers and nothing else was
>> ever really using it (as can be seen from the commit).
> 
> Thinkpad X220... how do I tell if I was using them? I believe so,
> because I uncovered bug in them before.

You are certainly using bounce buffers.  What does lspci -knn show?