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[2003:cb:c702:b500:3ed7:a1c7:447e:2279]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-367a13b61f7sm2934238f8f.13.2024.07.05.02.25.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 05 Jul 2024 02:25:23 -0700 (PDT) Message-ID: <40ba1239-bbe2-470b-8574-c7e098b40bc7@redhat.com> Date: Fri, 5 Jul 2024 11:25:22 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/2] mm: add docs for per-order mTHP split counters To: Ryan Roberts , Lance Yang , akpm@linux-foundation.org Cc: dj456119@gmail.com, 21cnbao@gmail.com, shy828301@gmail.com, ziy@nvidia.com, libang.li@antgroup.com, baolin.wang@linux.alibaba.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Barry Song , Mingzhe Yang References: <20240704012905.42971-1-ioworker0@gmail.com> <20240704012905.42971-3-ioworker0@gmail.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: 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-Stat-Signature: puqga76ixio7uqd74zh7ek7too1y191x X-Rspamd-Queue-Id: 9EC39C000F X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1720171527-957463 X-HE-Meta: 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 K+yKqZJp 9H2yyDU9LsnACQQbod5nOvTRfzAeEoCrFLLYhQrtGpCn1GXu6DrxRsiPP2OSFewQgHj3IQE56yWpPCBPFDBybvwvtSOrcJSjyxww+932+s9qqMw2yRbtLwpxV7oy4JahX7JJi969hmQJoR6LODPIODAVF7eKIUBKFfFIHU2TTarHPKdACrqSnV34A86ul115+2fE8SdoTXhnGLlnpwwRYFYCNWx6aw2+zWPG08R1pZfYDd0oZx5RNe28e/xds5HyZAjNW2JWAELGb4Omot7+ttuJf9+w7GOvtTJCBx+MkSR0VMdTelyv/ywb5PXcxBxJiEy+2AwgtiNBE5T+oyVNS6GRtSQRNCF0JKpTK8YA6ZU8TpiEH47/UAZCVzL8BgEwXhfGQG/GWsw+hGcZIMdNi2T7sNgNBD5FSKVxrpUlywoiK9sKm48hbIOCmQDjt4G/grFj4SCLAL1HzF3zjeqpR9XG5UqSCcJ0MPW1Z 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 05.07.24 11:16, Ryan Roberts wrote: > On 04/07/2024 02:29, Lance Yang wrote: >> This commit introduces documentation for mTHP split counters in >> transhuge.rst. >> >> Reviewed-by: Barry Song >> Signed-off-by: Mingzhe Yang >> Signed-off-by: Lance Yang >> --- >> Documentation/admin-guide/mm/transhuge.rst | 20 ++++++++++++++++---- >> 1 file changed, 16 insertions(+), 4 deletions(-) >> >> diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst >> index 1f72b00af5d3..0830aa173a8b 100644 >> --- a/Documentation/admin-guide/mm/transhuge.rst >> +++ b/Documentation/admin-guide/mm/transhuge.rst >> @@ -369,10 +369,6 @@ also applies to the regions registered in khugepaged. >> Monitoring usage >> ================ >> >> -.. note:: >> - Currently the below counters only record events relating to >> - PMD-sized THP. Events relating to other THP sizes are not included. >> - >> The number of PMD-sized anonymous transparent huge pages currently used by the >> system is available by reading the AnonHugePages field in ``/proc/meminfo``. >> To identify what applications are using PMD-sized anonymous transparent huge >> @@ -514,6 +510,22 @@ file_fallback_charge >> falls back to using small pages even though the allocation was >> successful. >> >> +split >> + is incremented every time a huge page is successfully split into >> + smaller orders. This can happen for a variety of reasons but a >> + common reason is that a huge page is old and is being reclaimed. >> + This action implies splitting any block mappings into PTEs. > > nit: the block mappings will already be PTEs if starting with mTHP? Was confused by that as well, so maybe just drop that detail here. -- Cheers, David / dhildenb