linux-kernel - Re: [PATCH v2 2/3] mm, page_owner: decouple freeing stack trace from debug

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Date:   Tue, 1 Oct 2019 14:35:15 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Qian Cai <cai@....pw>, "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Walter Wu <walter-zh.wu@...iatek.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: Re: [PATCH v2 2/3] mm, page_owner: decouple freeing stack trace from
 debug_pagealloc

On 10/1/19 2:32 PM, Vlastimil Babka wrote:
> On 10/1/19 2:26 PM, Qian Cai wrote:
>> On Tue, 2019-10-01 at 14:51 +0300, Kirill A. Shutemov wrote:
>>> On Tue, Oct 01, 2019 at 10:07:44AM +0200, Vlastimil Babka wrote:
>>>> On 10/1/19 1:49 AM, Qian Cai wrote:
>>>
>>> DEBUG_PAGEALLOC is much more intrusive debug option. Not all architectures
>>> support it in an efficient way. Some require hibernation.
>>>
>>> I don't see a reason to tie these two option together.
>>
>> Make sense. How about page_owner=on will have page_owner_free=on by default?
>> That way we don't need the extra parameter.
>  
> There were others that didn't want that overhead (memory+cpu) always. So the
> last version is as flexible as we can get, IMHO, before approaching bikeshed
> territory. It's just another parameter.

Or suggest how to replace page_owner=on with something else (page_owner=full?)
and I can change that. But I don't want to implement a variant where we store only
the freeing stack, though.