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[2003:cb:c73b:3100:2d28:e0b7:1254:b2f6]) by smtp.gmail.com with ESMTPSA id he11-20020a05600c540b00b0041568e91c41sm8290444wmb.41.2024.04.03.01.24.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 03 Apr 2024 01:24:45 -0700 (PDT) Message-ID: <56027891-090b-4501-ae0c-a86077caf303@redhat.com> Date: Wed, 3 Apr 2024 10:24:44 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] mm: add per-order mTHP alloc_success and alloc_fail counters To: Ryan Roberts , Barry Song <21cnbao@gmail.com> Cc: akpm@linux-foundation.org, linux-mm@kvack.org, willy@infradead.org, cerasuolodomenico@gmail.com, kasong@tencent.com, surenb@google.com, v-songbaohua@oppo.com, yosryahmed@google.com, yuzhao@google.com, chrisl@kernel.org, peterx@redhat.com References: <20240328095139.143374-1-21cnbao@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: 8bit X-Rspamd-Queue-Id: 2768380004 X-Rspam-User: X-Stat-Signature: 1uizimyanjj8dir9r68xt1aeiej48ssy X-Rspamd-Server: rspam01 X-HE-Tag: 1712132690-877768 X-HE-Meta: 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 lWEcDuel vM8eNripa5OGAsDzH1CMgIU08zVcjrMosB638RCkjRA3clpS+B/d2rh2vvS5q8IzCHLOMdtY1T1B/T2Bj40AoGqi9JwU2Aonm6wXFt/Wt+33phx4Rs5T5esQWzB4G526aUmCtSuMXpWhPCU9nsWKzfvIwMjh1Ghkm0m1TfnLQIegWjpIlJsmzulvCTl8Rk3W3RneY/DeglQb9fEXUVb8psAHl4g== 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 03.04.24 10:18, Ryan Roberts wrote: > On 02/04/2024 22:29, Barry Song wrote: >> On Wed, Apr 3, 2024 at 7:46 AM David Hildenbrand wrote: >>> >>> On 28.03.24 10:51, Barry Song wrote: >>>> From: Barry Song >>>> >>>> Profiling a system blindly with mTHP has become challenging due >>>> to the lack of visibility into its operations. Presenting the >>>> success rate of mTHP allocations appears to be pressing need. >>>> >>>> Recently, I've been experiencing significant difficulty debugging >>>> performance improvements and regressions without these figures. >>>> It's crucial for us to understand the true effectiveness of >>>> mTHP in real-world scenarios, especially in systems with >>>> fragmented memory. >>>> >>>> This patch sets up the framework for per-order mTHP counters, >>>> starting with the introduction of alloc_success and alloc_fail >>>> counters. Incorporating additional counters should now be >>>> straightforward as well. >>>> >>>> The initial two unsigned longs for each event are unused, given >>>> that order-0 and order-1 are not mTHP. Nonetheless, this refinement >>>> improves code clarity. >>>> >>>> Signed-off-by: Barry Song >>>> --- >>>> -v2: >>>> * move to sysfs and provide per-order counters; David, Ryan, Willy >>>> -v1: >>>> https://lore.kernel.org/linux-mm/20240326030103.50678-1-21cnbao@gmail.com/ >>>> >>>> include/linux/huge_mm.h | 17 +++++++++++++ >>>> mm/huge_memory.c | 54 +++++++++++++++++++++++++++++++++++++++++ >>>> mm/memory.c | 3 +++ >>>> 3 files changed, 74 insertions(+) >>>> >>>> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h >>>> index e896ca4760f6..27fa26a22a8f 100644 >>>> --- a/include/linux/huge_mm.h >>>> +++ b/include/linux/huge_mm.h >>>> @@ -264,6 +264,23 @@ unsigned long thp_vma_allowable_orders(struct vm_area_struct *vma, >>>> enforce_sysfs, orders); >>>> } >>>> >>>> +enum thp_event_item { >>>> + THP_ALLOC_SUCCESS, >>>> + THP_ALLOC_FAIL, >>>> + NR_THP_EVENT_ITEMS >>>> +}; >>> >>> I'm wondering if these should be ANON specific for now. We might want to >>> add others (shmem, file) in the future. >> >> I've two ways to do that >> 1. rename to ANON_THP_ALLOC, so that I can have SHMEM_THP_ALLOC, FILE_THP_ALLOC >> in the future; >> 2. let THP_ALLOC cover all of shmem, file and anon. >> >> following vmstat, actually 1 might be better as we have both THP_FAULT_ALLOC and >> THP_FILE_ALLOC for pmd-mapped THP. >> >> #ifdef CONFIG_TRANSPARENT_HUGEPAGE >> THP_FAULT_ALLOC, >> THP_FAULT_FALLBACK, >> THP_FAULT_FALLBACK_CHARGE, >> THP_COLLAPSE_ALLOC, >> THP_COLLAPSE_ALLOC_FAILED, >> THP_FILE_ALLOC, >> THP_FILE_FALLBACK, >> THP_FILE_FALLBACK_CHARGE, >> THP_FILE_MAPPED, >> THP_SPLIT_PAGE, >> THP_SPLIT_PAGE_FAILED, >> THP_DEFERRED_SPLIT_PAGE, >> THP_SPLIT_PMD, >> THP_SCAN_EXCEED_NONE_PTE, >> THP_SCAN_EXCEED_SWAP_PTE, >> THP_SCAN_EXCEED_SHARED_PTE, >> #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD >> THP_SPLIT_PUD, >> #endif >> THP_ZERO_PAGE_ALLOC, >> THP_ZERO_PAGE_ALLOC_FAILED, >> THP_SWPOUT, >> THP_SWPOUT_FALLBACK, >> #endif >> >> And reading mm/shmem.c, obviously, shmem is using THP_FILE_ALLOC. >> >> I will rename it to ANON_THP_ALLOC in v3, let me know if you disagree :-) > > I don't think the name of the enum is important - its an implementation detail > that can be changed. Its the name of the sysfs file that matters. Although of > course its nice to keep them in sync from a maintenance pov. Jup. > > Currently they are called "alloc_success" and "alloc_fail" I believe? Perhaps > "anon_alloc" and "anon_alloc_fallback" are a bit more in keeping with vmstat? > > I'm assuming that: > > vmstat:thp_fault_alloc == hugepages-2048kB/stats/anon_alloc > vmstat:thp_fault_alloc_fallback == hugepages-2048kB/stats/anon_alloc_fallback Or an "anon" subdirectory ... not sure, just a thought. -- Cheers, David / dhildenb