linux-kernel - Re: [PATCH] mm: alloc_contig_range: demote pages busy message from warn to info

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Message-ID: <5458E084.2060208@hurleysoftware.com>
Date:	Tue, 04 Nov 2014 09:19:48 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Michal Nazarewicz <mina86@...a86.com>,
	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: alloc_contig_range: demote pages busy message from
 warn to info

On 11/04/2014 08:35 AM, Michal Nazarewicz wrote:
> On Tue, Nov 04 2014, Peter Hurley <peter@...leysoftware.com> wrote:
>> On 11/04/2014 12:43 AM, Minchan Kim wrote:
>>> Hello,
>>>
>>> On Mon, Nov 03, 2014 at 05:57:53PM +0100, Michal Nazarewicz wrote:
>>>> Having test_pages_isolated failure message as a warning confuses
>>>> users into thinking that it is more serious than it really is.  In
>>>> reality, if called via CMA, allocation will be retried so a single
>>>> test_pages_isolated failure does not prevent allocation from
>>>> succeeding.
>>>>
>>>> Demote the warning message to an info message and reformat it such
>>>> that the text “failed” does not appear and instead a less worrying
>>>> “PFNS busy” is used.
>>>
>>> What do you expect from this message? Please describe it so that we can
>>> review below message helps your goal.
>>
>> I expect this message to not show up in logs unless there is a real problem.
> 
> So frankly I don't care.  Feel free to send a patch removing the message
> all together.  I'll be happy to ack it.

I'd rather just remove CMA allocation from the iommu providers on x86.

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