linux-kernel - Re: [PATCH 5/5] mm, memory_hotplug: be more verbose for memory offline failures

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Message-ID: <1542365221.3020.9.camel@suse.de>
Date:   Fri, 16 Nov 2018 11:47:01 +0100
From:   osalvador <osalvador@...e.de>
To:     Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Baoquan He <bhe@...hat.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 5/5] mm, memory_hotplug: be more verbose for memory
 offline failures

On Fri, 2018-11-16 at 09:30 +0100, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index a919ba5cb3c8..ec2c7916dc2d 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -7845,6 +7845,7 @@ bool has_unmovable_pages(struct zone *zone,
> struct page *page, int count,
>  	return false;
>  unmovable:
>  	WARN_ON_ONCE(zone_idx(zone) == ZONE_MOVABLE);
> +	dump_page(pfn_to_page(pfn+iter), "unmovable page");

Would not be enough to just do:

dump_page(page, "unmovable page".

Unless I am missing something, page should already have the
right pfn?

<---
unsigned long check = pfn + iter;
page = pfn_to_page(check);
--->

The rest looks good to me

Reviewed-by: Oscar Salvador <osalvador@...e.de>