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([132.237.156.254]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74af56d0cb1sm9410550b3a.134.2025.06.30.11.08.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Jun 2025 11:08:22 -0700 (PDT) From: Suresh K C X-Google-Original-From: Suresh K C To: nphamcs@gmail.com, hannes@cmpxchg.org, shuah@kernel.org Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Suresh K C Subject: [PATCH] selftests: cachestat: add tests for mmap Date: Mon, 30 Jun 2025 23:38:03 +0530 Message-ID: <20250630180803.12866-1-suresh.k.chandrappa@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 06EA8180005 X-Stat-Signature: 1gxqe7em6xudbgq4sc1bfnzapfpwfyft X-HE-Tag: 1751306903-508516 X-HE-Meta: U2FsdGVkX18zUBV/mKYRV1/jP+0dQ1iJ57R0GUMvgn8UgEg5XL+KUwhb/q6DEoxr52GlP8kd81Bfl6R3b3w1veAJFFtDtb3/FQn9z8fUgqXvURMdbeDymJPTSFG5M1YZWzxhrgYUC5NSE5RgJ74knvwFicml446PfrXjBl7jjHsRfD2uk1NShiz2Xyae9sM3wJ+5Nn1AuT/0H4t+wzrNJNAzd12f2ISjbjhjBMdE0K5nhBMGzfMIj2A5UYiKk5jQg5V0r0dIGpD4k36JVKIYb8lHZ30VRZBde8xWCAxi7vJbRqey4/ta/0NmdJE1TGn+g+hWKH73OqMzs5B1aPDZFlECUbBLSOJr+Twhu0mAUreUNDtMuXlr1Dw0/AbOyPFtrl85iIds6yzpGO/w/nsYqSl3a0yjcY28D4Dd72l4+jA+wxo6wx3oG4fEghUSsbQrpxbU8DhztV42pCHgp2sKF+t5S04FZLurHA5L28rxA8u+3V+psDWGsXTmED0N8L5JNKiL7qquWo+RUA8ymLmADzVrOf87LMYlBdY4WjUmg/fKO7lfxcrVlufaEOC3aWGGvs0bBDP3BTvyy+qCok3hEnFuhERvnmyGkrWI5VJjTRtscdOPM2BlKhZfOCzk66D9GhSi3F1k23Vol2Re1P9EHr8e6uV72BDRV/DTc2jWzlDmKWH1nYKsjFvR2o5imaYwVYAlDkm3otdMSkX8xILwLWDoxAJqHj4XMp+Rw5NuLg9PclMC6Jazf9zjX8N1r/1iCTnqyiLd+dPFdZ29kfdKQcwUCzQ0M8XHZTSUeH9pdZJ/Ype3qymj8sF/xNSGTOHIJ4HzAE5dnlapFb6KQC2ugi4KKB255DjLZksrJn6iGUfUtvGurKaY/zz6FRiCvNDoCZlxex1FnXMxvFIj+7f4sMDiqOwKMQUkA4GAbZ+sEqpkAW5eMMq6Gq7rw2wHy3n3Mi0kEBWA0yVPCLXyfeD 3dWPzqh5 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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: From: Suresh K C Add a test case to verify cachestat behavior with memory-mapped files using mmap(). This ensures that pages accessed via mmap are correctly accounted for in the page cache. Tested on x86_64 with default kernel config Signed-off-by: Suresh K C --- .../selftests/cachestat/test_cachestat.c | 39 ++++++++++++++++--- 1 file changed, 33 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/cachestat/test_cachestat.c b/tools/testing/selftests/cachestat/test_cachestat.c index 632ab44737ec..b6452978dae0 100644 --- a/tools/testing/selftests/cachestat/test_cachestat.c +++ b/tools/testing/selftests/cachestat/test_cachestat.c @@ -33,6 +33,11 @@ void print_cachestat(struct cachestat *cs) cs->nr_evicted, cs->nr_recently_evicted); } +enum file_type { + FILE_MMAP, + FILE_SHMEM +}; + bool write_exactly(int fd, size_t filesize) { int random_fd = open("/dev/urandom", O_RDONLY); @@ -202,7 +207,7 @@ static int test_cachestat(const char *filename, bool write_random, bool create, return ret; } -bool test_cachestat_shmem(void) +bool run_cachestat_test(enum file_type type) { size_t PS = sysconf(_SC_PAGESIZE); size_t filesize = PS * 512 * 2; /* 2 2MB huge pages */ @@ -212,27 +217,43 @@ bool test_cachestat_shmem(void) char *filename = "tmpshmcstat"; struct cachestat cs; bool ret = true; + int fd; unsigned long num_pages = compute_len / PS; - int fd = shm_open(filename, O_CREAT | O_RDWR, 0600); + if (type == FILE_SHMEM) + fd = shm_open(filename, O_CREAT | O_RDWR, 0600); + else + fd = open(filename, O_RDWR | O_CREAT | O_TRUNC, 0666); if (fd < 0) { - ksft_print_msg("Unable to create shmem file.\n"); + ksft_print_msg("Unable to create file.\n"); ret = false; goto out; } if (ftruncate(fd, filesize)) { - ksft_print_msg("Unable to truncate shmem file.\n"); + ksft_print_msg("Unable to truncate file.\n"); ret = false; goto close_fd; } if (!write_exactly(fd, filesize)) { - ksft_print_msg("Unable to write to shmem file.\n"); + ksft_print_msg("Unable to write to file.\n"); ret = false; goto close_fd; } + if (type == FILE_MMAP){ + char *map = mmap(NULL, filesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + if (map == MAP_FAILED) { + ksft_print_msg("mmap failed.\n"); + ret = false; + goto close_fd; + } + for (int i = 0; i < filesize; i++) { + map[i] = 'A'; + } + map[filesize - 1] = 'X'; + } syscall_ret = syscall(__NR_cachestat, fd, &cs_range, &cs, 0); if (syscall_ret) { @@ -308,12 +329,18 @@ int main(void) break; } - if (test_cachestat_shmem()) + if (run_cachestat_test(FILE_SHMEM)) ksft_test_result_pass("cachestat works with a shmem file\n"); else { ksft_test_result_fail("cachestat fails with a shmem file\n"); ret = 1; } + if (run_cachestat_test(FILE_MMAP)) + ksft_test_result_pass("cachestat works with a mmap file\n"); + else { + ksft_test_result_fail("cachestat fails with a mmap file\n"); + ret = 1; + } return ret; } -- 2.43.0