linux-kernel - Re: [PATCH v2 03/10] mm/memory_hotplug: simplify page offlining

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Message-ID: <20200907064556.GB30144@dhcp22.suse.cz>
Date:   Mon, 7 Sep 2020 08:45:56 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Wei Yang <richard.weiyang@...ux.alibaba.com>,
        Baoquan He <bhe@...hat.com>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v2 03/10] mm/memory_hotplug: simplify page offlining

On Fri 04-09-20 12:21:34, Andrew Morton wrote:
> On Fri, 4 Sep 2020 07:47:45 +0200 David Hildenbrand <david@...hat.com> wrote:
[...]
> @@ -1589,9 +1567,7 @@ int __ref offline_pages(unsigned long st
>  			reason = "failure to dissolve huge pages";
>  			goto failed_removal_isolated;
>  		}
> -		/* check again */
> -		ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn,
> -					    NULL, check_pages_isolated_cb);
> +
>  		/*
>  		 * per-cpu pages are drained in start_isolate_page_range, but if
>  		 * there are still pages that are not free, make sure that we
> @@ -1604,15 +1580,15 @@ int __ref offline_pages(unsigned long st
>  		 * because has_unmovable_pages explicitly checks for
>  		 * PageBuddy on freed pages on other zones.
>  		 */
> +		ret = test_pages_isolated(start_pfn, end_pfn, MEMORY_OFFLINE);
>  		if (ret)
>  			drain_all_pages(zone);
>  	} while (ret);

Looks ok
-- 
Michal Hocko
SUSE Labs