Re: [PATCH v1 5/5] mm/memory_hotplug: print only with DEBUG_VM in online/offline_pages()

From: Oscar Salvador <osalvador@techadventures.net>
To: David Hildenbrand <david@redhat.com>
Cc: linux-kernel@vger.kernel.org, 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>
Subject: Re: [PATCH v1 5/5] mm/memory_hotplug: print only with DEBUG_VM in online/offline_pages()
Date: Fri, 17 Aug 2018 10:18:53 +0200	[thread overview]
Message-ID: <20180817081853.GB17638@techadventures.net> (raw)
In-Reply-To: <20180816100628.26428-6-david@redhat.com>

>  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.

> +#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