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Subject: Re: [PATCH v1 5/5] mm/memory_hotplug: print only with DEBUG_VM in
 online/offline_pages()
To:     linux-kernel@vger.kernel.org
Cc:     linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@suse.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Pavel Tatashin <pasha.tatashin@oracle.com>,
        Kemi Wang <kemi.wang@intel.com>,
        David Rientjes <rientjes@google.com>,
        Jia He <jia.he@hxt-semitech.com>,
        Oscar Salvador <osalvador@suse.de>,
        Petr Tesarik <ptesarik@suse.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Mathieu Malaterre <malat@debian.org>,
        Baoquan He <bhe@redhat.com>,
        Wei Yang <richard.weiyang@gmail.com>,
        Ross Zwisler <zwisler@kernel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
References: <20180816100628.26428-1-david@redhat.com>
 <20180816100628.26428-6-david@redhat.com>
From:   David Hildenbrand <david@redhat.com>
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Organization: Red Hat GmbH
Message-ID: <7892e949-6c2c-9659-a595-177037d0e203@redhat.com>
Date:   Mon, 20 Aug 2018 12:46:25 +0200
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On 16.08.2018 12:06, David Hildenbrand wrote:
> Let's try to minimze the noise.
> 
> Signed-off-by: David Hildenbrand <david@redhat.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.

-- 

Thanks,

David / dhildenb