linux-kernel - Re: [PATCH RFC 6/6] PM / Hibernate: exclude all PageOffline() pages

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Message-ID: <20181115122302.GR23831@dhcp22.suse.cz>
Date:   Thu, 15 Nov 2018 13:23:02 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, devel@...uxdriverproject.org,
        linux-fsdevel@...r.kernel.org, linux-pm@...r.kernel.org,
        xen-devel@...ts.xenproject.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH RFC 6/6] PM / Hibernate: exclude all PageOffline() pages

On Wed 14-11-18 22:17:04, David Hildenbrand wrote:
[...]
> diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
> index b0308a2c6000..01db1d13481a 100644
> --- a/kernel/power/snapshot.c
> +++ b/kernel/power/snapshot.c
> @@ -1222,7 +1222,7 @@ static struct page *saveable_highmem_page(struct zone *zone, unsigned long pfn)
>  	BUG_ON(!PageHighMem(page));
>  
>  	if (swsusp_page_is_forbidden(page) ||  swsusp_page_is_free(page) ||
> -	    PageReserved(page))
> +	    PageReserved(page) || PageOffline(page))
>  		return NULL;
>  
>  	if (page_is_guard(page))
> @@ -1286,6 +1286,9 @@ static struct page *saveable_page(struct zone *zone, unsigned long pfn)
>  	if (swsusp_page_is_forbidden(page) || swsusp_page_is_free(page))
>  		return NULL;
>  
> +	if (PageOffline(page))
> +		return NULL;
> +
>  	if (PageReserved(page)
>  	    && (!kernel_page_present(page) || pfn_is_nosave(pfn)))
>  		return NULL;

Btw. now that you are touching this file could you also make
s@..._to_page@..._to_online_page@ please? We really do not want to touch
offline pfn ranges in general. A separate patch for that of course.

Thanks!
-- 
Michal Hocko
SUSE Labs