From: David Hildenbrand <david@redhat.com>
To: Michal Hocko <mhocko@suse.com>, Oscar Salvador <osalvador@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
Muchun Song <songmuchun@bytedance.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 5/5] mm,page_alloc: Drop unnecessary checks from pfn_range_valid_contig
Date: Wed, 17 Mar 2021 15:36:35 +0100 [thread overview]
Message-ID: <ef5560a4-8633-39bd-e433-6aa8f6ea4bfc@redhat.com> (raw)
In-Reply-To: <YFISpUUxusP4T1xw@dhcp22.suse.cz>
On 17.03.21 15:31, Michal Hocko wrote:
> On Wed 17-03-21 12:12:51, Oscar Salvador wrote:
>> pfn_range_valid_contig() bails out when it finds an in-use page or a
>> hugetlb page, among other things.
>> We can drop the in-use page check since __alloc_contig_pages can migrate
>> away those pages, and the hugetlb page check can go too since
>> isolate_migratepages_range is now capable of dealing with hugetlb pages.
>> Either way, those checks are racy so let the end function handle it
>> when the time comes.
>
> I haven't realized PageHuge check is done this early. This means that
> previous patches are not actually active until now which is not really
> greate for bisectability. Can we remove the HugePage check earlier?
alloc_contig_pages() vs. alloc_contig_range(). The patches are active
for virtio-mem and CMA AFAIKS.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-03-17 14:37 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-17 11:12 [PATCH v5 0/5] Make alloc_contig_range handle Hugetlb pages Oscar Salvador
2021-03-17 11:12 ` [PATCH v5 1/5] mm,page_alloc: Bail out earlier on -ENOMEM in alloc_contig_migrate_range Oscar Salvador
2021-03-17 14:05 ` Michal Hocko
2021-03-17 14:42 ` David Hildenbrand
2021-03-17 14:49 ` Michal Hocko
2021-03-18 11:04 ` Oscar Salvador
2021-03-18 11:37 ` Michal Hocko
2021-03-17 11:12 ` [PATCH v5 2/5] mm,compaction: Let isolate_migratepages_{range,block} return error codes Oscar Salvador
2021-03-17 14:12 ` Michal Hocko
2021-03-17 14:38 ` Oscar Salvador
2021-03-17 14:59 ` Michal Hocko
2021-03-18 9:50 ` Vlastimil Babka
2021-03-18 10:22 ` Michal Hocko
2021-03-18 11:10 ` Vlastimil Babka
2021-03-18 11:36 ` Michal Hocko
2021-03-19 9:57 ` Oscar Salvador
2021-03-19 10:14 ` Vlastimil Babka
2021-03-19 10:26 ` Oscar Salvador
2021-03-17 11:12 ` [PATCH v5 3/5] mm: Make alloc_contig_range handle free hugetlb pages Oscar Salvador
2021-03-17 14:22 ` Michal Hocko
2021-03-17 11:12 ` [PATCH v5 4/5] mm: Make alloc_contig_range handle in-use " Oscar Salvador
2021-03-17 14:26 ` Michal Hocko
2021-03-18 8:54 ` Oscar Salvador
2021-03-18 9:29 ` Michal Hocko
2021-03-18 9:59 ` Oscar Salvador
2021-03-18 10:12 ` Michal Hocko
2021-03-17 11:12 ` [PATCH v5 5/5] mm,page_alloc: Drop unnecessary checks from pfn_range_valid_contig Oscar Salvador
2021-03-17 11:15 ` David Hildenbrand
2021-03-17 14:31 ` Michal Hocko
2021-03-17 14:36 ` David Hildenbrand [this message]
2021-03-17 15:03 ` Michal Hocko
2021-03-18 8:44 ` Oscar Salvador
2021-03-18 8:55 ` Michal Hocko
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