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[2003:d8:2f27:6d00:7b96:afc9:83d0:5bd]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3ece199ad24sm745170f8f.50.2025.09.17.03.58.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 17 Sep 2025 03:58:37 -0700 (PDT) Message-ID: <1308de0e-bb5a-481f-a447-ee4440ffb419@redhat.com> Date: Wed, 17 Sep 2025 12:58:35 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/7] mm/selftests: add max_vma_count tests To: Kalesh Singh , akpm@linux-foundation.org, minchan@kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, pfalcato@suse.de Cc: kernel-team@android.com, android-mm@google.com, Alexander Viro , Christian Brauner , Jan Kara , Kees Cook , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Ben Segall , Mel Gorman , Valentin Schneider , Jann Horn , Shuah Khan , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org References: <20250915163838.631445-1-kaleshsingh@google.com> <20250915163838.631445-3-kaleshsingh@google.com> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit > + * test_suite_setup - Set up the VMA layout for VMA count testing. > + * > + * Sets up the following VMA layout: > + * > + * +----- base_addr > + * | > + * V > + * +--------------+----------------------+--------------+----------------+--------------+----------------+--------------+-----+----------------+--------------+ > + * | Guard Page | | Guard Page | Extra Map 1 | Unmapped Gap | Extra Map 2 | Unmapped Gap | ... | Extra Map N | Unmapped Gap | > + * | (unmapped) | TEST_AREA | (unmapped) | (mapped page) | (1 page) | (mapped page) | (1 page) | ... | (mapped page) | (1 page) | > + * | (1 page) | (unmapped, 3 pages) | (1 page) | (1 page) | | (1 page) | | | (1 page) | | > + * +--------------+----------------------+--------------+----------------+--------------+----------------+--------------+-----+----------------+--------------+ > + * ^ ^ ^ ^ ^ > + * | | | | | > + * +--GUARD_SIZE--+ | +-- EXTRA_MAPS points here Sufficient EXTRA_MAPS to ---+ > + * (PAGE_SIZE) | | reach MAX_VMA_COUNT > + * | | > + * +--- TEST_AREA_SIZE ---+ > + * | (3 * PAGE_SIZE) | > + * ^ > + * | > + * +-- TEST_AREA starts here > + * > Just wondering if we could find a different name than "guard page" here, to not confuse stuff with guard ptes Will the current "guard page" we a valid vma or just a hole? -- Cheers David / dhildenb