linux-kernel - Re: [PATCH v1 5/5] mm/memory_hotplug: print only with DEBUG_VM in online/offline

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Date:   Sun, 19 Aug 2018 20:34:03 +0800
From:   Wei Yang <richard.weiyang@...il.com>
To:     Oscar Salvador <osalvador@...hadventures.net>
Cc:     David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Kemi Wang <kemi.wang@...el.com>,
        David Rientjes <rientjes@...gle.com>,
        Jia He <jia.he@...-semitech.com>,
        Oscar Salvador <osalvador@...e.de>,
        Petr Tesarik <ptesarik@...e.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Mathieu Malaterre <malat@...ian.org>,
        Baoquan He <bhe@...hat.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Ross Zwisler <zwisler@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v1 5/5] mm/memory_hotplug: print only with DEBUG_VM in
 online/offline_pages()

On Fri, Aug 17, 2018 at 10:18:53AM +0200, Oscar Salvador wrote:
>>  failed_addition:
>> +#ifdef CONFIG_DEBUG_VM
>>  	pr_debug("online_pages [mem %#010llx-%#010llx] failed\n",
>>  		 (unsigned long long) pfn << PAGE_SHIFT,
>>  		 (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1);
>> +#endif
>
>I have never been sure about this.
>IMO, if I fail to online pages, I want to know I failed.
>I think that pr_err would be better than pr_debug and without CONFIG_DEBUG_VM.
>
>But at least, if not, envolve it with a CONFIG_DEBUG_VM, but change pr_debug to pr_info.
>

I don't have a clear rule about these debug macro neither.

While when you look at the page related logs in calculate_node_totalpages(),
it is KERNEL_DEBUG level and without any config macro.

Maybe we should leave them at the same state?

>> +#ifdef CONFIG_DEBUG_VM
>>  	pr_debug("memory offlining [mem %#010llx-%#010llx] failed\n",
>>  		 (unsigned long long) start_pfn << PAGE_SHIFT,
>>  		 ((unsigned long long) end_pfn << PAGE_SHIFT) - 1);
>> +#endif
>
>Same goes here.
>
>Thanks
>-- 
>Oscar Salvador
>SUSE L3

-- 
Wei Yang
Help you, Help me