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

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Date:   Thu, 30 Aug 2018 22:36:33 +0000
From:   Pasha Tatashin <Pavel.Tatashin@...rosoft.com>
To:     David Hildenbrand <david@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "linux-mm@...ck.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>,
        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 8/20/18 6:46 AM, David Hildenbrand wrote:
> On 16.08.2018 12:06, David Hildenbrand wrote:
>> Let's try to minimze the noise.
>>
>> Signed-off-by: David Hildenbrand <david@...hat.com>
>> ---
>>  mm/memory_hotplug.c | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
>> index bbbd16f9d877..6fec2dc6a73d 100644
>> --- a/mm/memory_hotplug.c
>> +++ b/mm/memory_hotplug.c
>> @@ -966,9 +966,11 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
>>  	return 0;
>>  
>>  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
>>  	memory_notify(MEM_CANCEL_ONLINE, &arg);
>>  	return ret;
>>  }
>> @@ -1660,7 +1662,9 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
>>  	offlined_pages = check_pages_isolated(start_pfn, end_pfn);
>>  	if (offlined_pages < 0)
>>  		goto repeat;
>> +#ifdef CONFIG_DEBUG_VM
>>  	pr_info("Offlined Pages %ld\n", offlined_pages);
>> +#endif
>>  	/* Ok, all of our target is isolated.
>>  	   We cannot do rollback at this point. */
>>  	offline_isolated_pages(start_pfn, end_pfn);
>> @@ -1695,9 +1699,11 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
>>  	return 0;
>>  
>>  failed_removal:
>> +#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
>>  	memory_notify(MEM_CANCEL_OFFLINE, &arg);
>>  	/* pushback to free area */
>>  	undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
>>
> 
> I'll drop this patch for now, maybe the error messages are actually
> useful when debugging a crashdump of a system without CONFIG_DEBUG_VM.
> 

Yes, please drop it, no reason to reduce amount of these messages. They
are useful.

Thank you,
Pavel