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

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Message-ID: <20180817081853.GB17638@techadventures.net>
Date:   Fri, 17 Aug 2018 10:18:53 +0200
From:   Oscar Salvador <osalvador@...hadventures.net>
To:     David Hildenbrand <david@...hat.com>
Cc:     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()

>  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