linux-kernel - Re: [PATCH v1 8/8] PM / Hibernate: exclude all PageOffline() pages

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Date:   Tue, 20 Nov 2018 22:22:21 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
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,
        kexec-ml <kexec@...ts.infradead.org>, pv-drivers@...are.com,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH v1 8/8] PM / Hibernate: exclude all PageOffline() pages

On Monday, November 19, 2018 11:16:16 AM CET David Hildenbrand wrote:
> The content of pages that are marked PG_offline is not of interest
> (e.g. inflated by a balloon driver), let's skip these pages.
> 
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Len Brown <len.brown@...el.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Matthew Wilcox <willy@...radead.org>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: "Michael S. Tsirkin" <mst@...hat.com>
> Acked-by: Pavel Machek <pavel@....cz>
> Signed-off-by: David Hildenbrand <david@...hat.com>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  kernel/power/snapshot.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
> index 87e6dd57819f..8d7b4d458842 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;
>