From: Oscar Salvador <osalvador@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@redhat.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
mhocko@suse.com
Subject: Re: [PATCH] mm,memory_hotplug: Fix scan_movable_pages for gigantic hugepages
Date: Tue, 29 Jan 2019 09:27:00 +0100 [thread overview]
Message-ID: <20190129082658.erftot43e5ogasif@d104.suse.de> (raw)
In-Reply-To: <20190128145617.069b3a5436fc7e34bdebb104@linux-foundation.org>
On Mon, Jan 28, 2019 at 02:56:17PM -0800, Andrew Morton wrote:
>
> --- a/mm/memory_hotplug.c~mmmemory_hotplug-fix-scan_movable_pages-for-gigantic-hugepages-fix
> +++ a/mm/memory_hotplug.c
> @@ -1305,28 +1305,27 @@ int test_pages_in_a_zone(unsigned long s
> static unsigned long scan_movable_pages(unsigned long start, unsigned long end)
> {
> unsigned long pfn;
> - struct page *page;
> +
> for (pfn = start; pfn < end; pfn++) {
> - if (pfn_valid(pfn)) {
> - page = pfn_to_page(pfn);
> - if (PageLRU(page))
> - return pfn;
> - if (__PageMovable(page))
> - return pfn;
> - if (PageHuge(page)) {
> - struct page *head = compound_head(page);
> + struct page *page, *head;
> + unsigned long skip;
>
> - if (hugepage_migration_supported(page_hstate(head)) &&
> - page_huge_active(head))
> - return pfn;
> - else {
> - unsigned long skip;
> + if (!pfn_valid(pfn))
> + continue;
> + page = pfn_to_page(pfn);
> + if (PageLRU(page))
> + return pfn;
> + if (__PageMovable(page))
> + return pfn;
>
> - skip = (1 << compound_order(head)) - (page - head);
> - pfn += skip - 1;
> - }
> - }
> - }
> + if (!PageHuge(page))
> + continue;
> + head = compound_head(page);
> + if (hugepage_migration_supported(page_hstate(head)) &&
> + page_huge_active(head))
> + return pfn;
> + skip = (1 << compound_order(head)) - (page - head);
> + pfn += skip - 1;
> }
> return 0;
> }
It looks much better, thanks a lot for the cleanup Andrew!
--
Oscar Salvador
SUSE L3
next prev parent reply other threads:[~2019-01-29 8:27 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-22 15:44 [PATCH] mm,memory_hotplug: Fix scan_movable_pages for gigantic hugepages Oscar Salvador
2019-01-22 23:47 ` Anthony Yznaga
2019-01-23 9:47 ` Michal Hocko
2019-01-23 10:18 ` Oscar Salvador
2019-01-23 10:22 ` Michal Hocko
2019-01-23 10:33 ` David Hildenbrand
2019-01-25 7:58 ` Oscar Salvador
2019-01-28 22:53 ` Andrew Morton
2019-01-28 22:56 ` Andrew Morton
2019-01-29 7:33 ` Michal Hocko
2019-01-29 8:27 ` Oscar Salvador [this message]
2019-01-29 10:03 ` David Hildenbrand
2019-01-30 7:52 ` Oscar Salvador
2019-01-28 22:53 ` Andrew Morton
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