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SubjectRe: [PATCH v2] mm: page_alloc: dump migrate-failed pages
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On 10.03.21 08:42, Minchan Kim wrote:
> On Tue, Mar 09, 2021 at 08:15:41AM -0800, Minchan Kim wrote:
>
> < snip >
>
>>> [...]
>>>> +void dump_migrate_failure_pages(struct list_head *page_list)
>>>> +{
>>>> + DEFINE_DYNAMIC_DEBUG_METADATA(descriptor,
>>>> + "migrate failure");
>>>> + if (DYNAMIC_DEBUG_BRANCH(descriptor) &&
>>>> + alloc_contig_ratelimit()) {
>>>> + struct page *page;
>>>> +
>>>> + WARN(1, "failed callstack");
>>>> + list_for_each_entry(page, page_list, lru)
>>>> + dump_page(page, "migration failure");
>>>> + }
>>>
>>> Apart from the above, do we have to warn for something that is a
>>> debugging aid? A similar concern wrt dump_page which uses pr_warn and
>>
>> Make sense.
>>
>>> page owner is using even pr_alert.
>>> Would it make sense to add a loglevel parameter both into __dump_page
>>> and dump_page_owner?
>>
>> Let me try it.
>
> I looked though them and made first draft to clean them up.
>
> It's bigger than my initial expectaion because there are many callsites
> to use dump_page and stack_trace_print inconsistent loglevel.
> Since it's not a specific problem for this work, I'd like to deal with
> it as separate patchset since I don't want to be stuck on here for my
> initial goal.

Why the need to rush regarding your series?

If it will clean up your patch significantly, then I think doing the
cleanups first is the proper way to go.

I really don't get why this is a real problem.


--
Thanks,

David / dhildenb

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