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[84.136.37.227]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-424c82519b0sm31626855e9.14.2024.06.26.09.22.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Jun 2024 09:22:27 -0700 (PDT) Message-ID: <8f85c31a-e603-4578-bf49-136dae0d4b69@redhat.com> Date: Wed, 26 Jun 2024 18:22:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 2/2] mm/migrate: move NUMA hinting fault folio isolation + checks under PTL To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, Andrew Morton , Donet Tom References: <20240620212935.656243-1-david@redhat.com> <20240620212935.656243-3-david@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20240620212935.656243-3-david@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 7B6C640028 X-Stat-Signature: nk963o8wa51pq5qzzczo535go7qwprw3 X-Rspam-User: X-HE-Tag: 1719418952-318068 X-HE-Meta: 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 YhUpIoW2 CM6BTdonXJ3MJQTg8M6UCpo9W9Xq5VaQydc6SyrL2sCB1zO0eDlNfccVB/NkwObZAXjFvlNzzUsj/WKLqlZ10GCwhFkU9G90r21wVwZxMastV5I46KgEQ+dU/KgF1+fu5sd+q9aNGBGymLSBQGJG3ICwlZraa07FTJpnUl/PkJqbNrobPfRNjyXD+aNRvKtSN9xw6iLFaZgq57PoY6SA0lQeIyJTJAUao827mYdUjF4iaCnN1EMssQITLi38xse5lIHtlMECadL0zTsPgZhlLbmKj+xluu2qZQ2ZS/8QX5IHSmYcpO4c1wsEFBLlkEMmFhXhZCxYiC8JcrCdLKzA87XbV7Xa0wvr55F3jriNkT6EwXHIbQ/llVv1cT/oyTtmo6xxZoBtmFAGEVfDamLJwAYqE7QJCP4ASEtO8 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 20.06.24 23:29, David Hildenbrand wrote: > Currently we always take a folio reference even if migration will not > even be tried or isolation failed, requiring us to grab+drop an additional > reference. > > Further, we end up calling folio_likely_mapped_shared() while the folio > might have already been unmapped, because after we dropped the PTL, that > can easily happen. We want to stop touching mapcounts and friends from > such context, and only call folio_likely_mapped_shared() while the folio > is still mapped: mapcount information is pretty much stale and unreliable > otherwise. > > So let's move checks into numamigrate_isolate_folio(), rename that > function to migrate_misplaced_folio_prepare(), and call that function > from callsites where we call migrate_misplaced_folio(), but still with > the PTL held. > > We can now stop taking temporary folio references, and really only take > a reference if folio isolation succeeded. Doing the > folio_likely_mapped_shared() + golio isolation under PT lock is now similar > to how we handle MADV_PAGEOUT. > > While at it, combine the folio_is_file_lru() checks. > > Signed-off-by: David Hildenbrand > --- Donet just reported an issue. I suspect this fixes it -- in any case, this is the right thing to do. From 0833b9896e98c8d88c521609c811a220d14a2e7e Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Wed, 26 Jun 2024 18:14:44 +0200 Subject: [PATCH] Fixup: mm/migrate: move NUMA hinting fault folio isolation + checks under PTL Donet reports an issue during NUMA migration we haven't seen previously: [ 71.422804] list_del corruption, c00c00000061b3c8->next is LIST_POISON1 (5deadbeef0000100) [ 71.422839] ------------[ cut here ]------------ [ 71.422843] kernel BUG at lib/list_debug.c:56! [ 71.422850] Oops: Exception in kernel mode, sig: 5 [#1] We forgot to convert one "return 0;" to return an error instead from migrate_misplaced_folio_prepare() in case the target node is nearly full. Signed-off-by: David Hildenbrand --- mm/migrate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/migrate.c b/mm/migrate.c index 8beedbb42a93..9ed43c1eea5e 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2564,7 +2564,7 @@ int migrate_misplaced_folio_prepare(struct folio *folio, int z; if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING)) - return 0; + return -EAGAIN; for (z = pgdat->nr_zones - 1; z >= 0; z--) { if (managed_zone(pgdat->node_zones + z)) break; base-commit: 4b17ce353e02b47b00e2fe87b862f09e8b9a47e6 -- 2.45.2 -- Cheers, David / dhildenb