From: Oscar Salvador <osalvador@suse.de>
To: Michal Hocko <mhocko@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
David Hildenbrand <david@redhat.com>,
Muchun Song <songmuchun@bytedance.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] mm: Make alloc_contig_range handle free hugetlb pages
Date: Thu, 18 Feb 2021 17:53:26 +0100 [thread overview]
Message-ID: <21c17c7429896cc259255340c6e3d61b@suse.de> (raw)
In-Reply-To: <YC5yzNB9xT76fkod@dhcp22.suse.cz>
On 2021-02-18 14:59, Michal Hocko wrote:
> As I've said. Page allocator can cope with NULL nodemask just fine.
> I have checked the code and now remember the tricky part. It is
> alloc_gigantic_page which cannot work with NULL nodemask because it
> relies on for_each_node_mask and that, unlike zonelist iterator, cannot
> cope with NULL node mask. This is the case only for !GFP_THISNODE.
Ok, thanks for the clarification.
> OK, I see the problem now. And your above solution is not really
> optimal either. Your put_page would add the page to the pool and so it
> could be used by somebody. One
Yeah, that is right.
> way around it would be either directly
> manipulating reference count which is fugly or you can make it a
> temporal page (alloc_migrate_huge_page) or maybe even better not
> special
> case this here but rather allow migrating free hugetlb pages in the
> migrate_page path.
I will have a look into it to see how what would look.
Thanks for the feedback
--
Oscar Salvador
SUSE L3
next prev parent reply other threads:[~2021-02-18 16:53 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-17 10:08 [PATCH 0/2] Make alloc_contig_range handle Hugetlb pages Oscar Salvador
2021-02-17 10:08 ` [PATCH 1/2] mm: Make alloc_contig_range handle free hugetlb pages Oscar Salvador
2021-02-17 13:30 ` Michal Hocko
2021-02-17 13:36 ` David Hildenbrand
2021-02-17 13:50 ` Michal Hocko
2021-02-17 13:53 ` David Hildenbrand
2021-02-17 13:59 ` Michal Hocko
2021-02-17 14:08 ` David Hildenbrand
2021-02-17 14:14 ` Michal Hocko
2021-02-17 14:23 ` Oscar Salvador
2021-02-17 13:42 ` Oscar Salvador
2021-02-17 15:00 ` Michal Hocko
2021-02-18 10:09 ` Oscar Salvador
2021-02-18 12:52 ` Michal Hocko
2021-02-18 13:32 ` Oscar Salvador
2021-02-18 13:59 ` Michal Hocko
2021-02-18 16:53 ` Oscar Salvador [this message]
2021-02-19 9:05 ` Oscar Salvador
2021-02-19 9:56 ` Michal Hocko
2021-02-19 10:14 ` Oscar Salvador
2021-02-19 20:00 ` Mike Kravetz
2021-02-19 10:40 ` Oscar Salvador
2021-02-19 10:55 ` Michal Hocko
2021-02-19 11:17 ` Oscar Salvador
2021-02-19 11:24 ` Michal Hocko
2021-02-17 10:08 ` [PATCH 2/2] mm: Make alloc_contig_range handle in-use " Oscar Salvador
2021-02-17 13:36 ` Michal Hocko
2021-02-17 13:46 ` Oscar Salvador
2021-02-17 13:54 ` Michal Hocko
2021-02-17 15:06 ` Michal Hocko
2021-02-17 15:27 ` Oscar Salvador
2021-02-17 15:33 ` Michal Hocko
2021-02-18 6:01 ` Oscar Salvador
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