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Sun, 17 Aug 2025 19:29:21 -0700 (PDT) Received: from localhost ([185.92.221.13]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-afcdd0104a4sm702355166b.87.2025.08.17.19.29.20 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Sun, 17 Aug 2025 19:29:20 -0700 (PDT) From: Wei Yang To: akpm@linux-foundation.org, david@redhat.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, riel@surriel.com, harry.yoo@oracle.com Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Wei Yang Subject: [Patch v3 0/2] assert rmap behaves as expected Date: Mon, 18 Aug 2025 02:29:03 +0000 Message-Id: <20250818022905.15428-1-richard.weiyang@gmail.com> X-Mailer: git-send-email 2.11.0 X-Stat-Signature: kbonu58s8wsfwk1mo38x4qrdwopyyftq X-Rspam-User: X-Rspamd-Queue-Id: 00587180007 X-Rspamd-Server: rspam05 X-HE-Tag: 1755484162-192503 X-HE-Meta: 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 Qpl9bqDw 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 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: As David suggested, currently we don't have a high level test case to verify the behavior of rmap. This patch set introduce the verification on rmap by migration. Patch 1 is a preparation to move ksm related operations into vm_util. Patch 2 is the new test case for rmap. Currently it covers following four scenarios: * anonymous page * shmem page * pagecache page * ksm page v2->v3: * handle ksm error return in worker * rebase on current mm-unstable v1->v2: * do check on file opening in init_global_file_handlers() * factor out ksm_merge() and ksm_unmerge() instead of partial of it * align the return value of helpers: 0 on success, -errno on error * skip instead of assert if numa not available * check ksm sys file before continue * use private anonymous map instead of shared map * check pfn instead of content * retry migrate * fault in region for each process by FORCE_READ() RFC->v1: * open file in function itself instead of pass fd as parameter * fault in the region by accessing it instead of print content Wei Yang (2): selftests/mm: put general ksm operation into vm_util selftests/mm: assert rmap behave as expected MAINTAINERS | 1 + tools/testing/selftests/mm/.gitignore | 1 + tools/testing/selftests/mm/Makefile | 3 + .../selftests/mm/ksm_functional_tests.c | 134 +----- tools/testing/selftests/mm/rmap.c | 433 ++++++++++++++++++ tools/testing/selftests/mm/run_vmtests.sh | 4 + tools/testing/selftests/mm/vm_util.c | 123 +++++ tools/testing/selftests/mm/vm_util.h | 7 + 8 files changed, 595 insertions(+), 111 deletions(-) create mode 100644 tools/testing/selftests/mm/rmap.c -- 2.34.1