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Fri, 6 Feb 2026 11:02:14 +0800 (CST) Received: from dggemv712-chm.china.huawei.com (unknown [10.1.198.32]) by mail.maildlp.com (Postfix) with ESMTPS id 530C14056A; Fri, 6 Feb 2026 11:06:28 +0800 (CST) Received: from kwepemq500010.china.huawei.com (7.202.194.235) by dggemv712-chm.china.huawei.com (10.1.198.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Fri, 6 Feb 2026 11:06:28 +0800 Received: from huawei.com (10.173.125.37) by kwepemq500010.china.huawei.com (7.202.194.235) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Fri, 6 Feb 2026 11:06:27 +0800 From: Miaohe Lin To: , CC: , , , , , , , , , , , , Subject: [PATCH v4 2/3] selftests/mm: add memory failure clean pagecache test Date: Fri, 6 Feb 2026 11:16:38 +0800 Message-ID: <20260206031639.2707102-3-linmiaohe@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20260206031639.2707102-1-linmiaohe@huawei.com> References: <20260206031639.2707102-1-linmiaohe@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.173.125.37] X-ClientProxiedBy: kwepems100002.china.huawei.com (7.221.188.206) To kwepemq500010.china.huawei.com (7.202.194.235) X-Rspam-User: X-Rspamd-Queue-Id: E7E2340008 X-Rspamd-Server: rspam07 X-Stat-Signature: xmzgy5aeougyy6wqnyjw1a6bcp8oecna X-HE-Tag: 1770347191-997048 X-HE-Meta: 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 dCpIEpV6 HfgaDxwy5iGwDCqptSC7TUTaulx8z2UVUeDrq0xcxS8Bw9xr4Ix1xzYP76kZ8dNHlVBeIkqIs0c09M1tx2H8Hx7NFr4oniQZz3foPnDAoEwZTZBmLFpZyMgbg/wM24wwXQa7YoUKqZZM+wqQR8M2b5PjNjbqjFK17qTbMsneuuAzuzfgH25RnmzNjslpNTMGuu1luJjceBJyJ8il87FVgeYAInXCuHc1LEYzRfMd6uIRcqXZbpVclC8QnjjfWWaGzwQhi3dyOkrpJ1SAeo6TUDzDNRg3Qo4/6Zk4Sjve26xvwGTAb829lgE6JJnxKBOe3JdOqA1odVwKkTAcPwWJgz2rfL02Wx49E2I8HhSLFalLNnDky1JpbLeyDu3AtRH5mFsn1DAJY760z2ZZDtFuwIDCTGQ== 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: This patch adds a new testcase to validate memory failure handling for clean pagecache. This test performs similar operations as anonymous pages except allocating memory using mmap() with a file fd. This test helps ensure that memory failure handling for clean pagecache works correctly, including unchanged page content, page isolation, and recovery paths. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202601221142.mDWA1ucw-lkp@intel.com/ Signed-off-by: Miaohe Lin --- tools/testing/selftests/mm/memory-failure.c | 66 +++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/tools/testing/selftests/mm/memory-failure.c b/tools/testing/selftests/mm/memory-failure.c index 37806a58f4b4..3aa624db9577 100644 --- a/tools/testing/selftests/mm/memory-failure.c +++ b/tools/testing/selftests/mm/memory-failure.c @@ -10,10 +10,14 @@ #include #include #include +#include #include #include #include #include +#include +#include +#include #include "vm_util.h" @@ -24,7 +28,9 @@ enum inject_type { enum result_type { MADV_HARD_ANON, + MADV_HARD_CLEAN_PAGECACHE, MADV_SOFT_ANON, + MADV_SOFT_CLEAN_PAGECACHE, }; static jmp_buf signal_jmp_buf; @@ -154,6 +160,8 @@ static void check(struct __test_metadata *_metadata, FIXTURE_DATA(memory_failure switch (type) { case MADV_SOFT_ANON: + case MADV_HARD_CLEAN_PAGECACHE: + case MADV_SOFT_CLEAN_PAGECACHE: /* It is not expected to receive a SIGBUS signal. */ ASSERT_EQ(setjmp, 0); @@ -236,4 +244,62 @@ TEST_F(memory_failure, anon) ASSERT_EQ(munmap(addr, self->page_size), 0); } +/* Borrowed from mm/gup_longterm.c. */ +static int get_fs_type(int fd) +{ + struct statfs fs; + int ret; + + do { + ret = fstatfs(fd, &fs); + } while (ret && errno == EINTR); + + return ret ? 0 : (int)fs.f_type; +} + +TEST_F(memory_failure, clean_pagecache) +{ + const char *fname = "./clean-page-cache-test-file"; + int fd; + char *addr; + int ret; + int fs_type; + + fd = open(fname, O_RDWR | O_CREAT, 0664); + if (fd < 0) + SKIP(return, "failed to open test file.\n"); + unlink(fname); + ftruncate(fd, self->page_size); + fs_type = get_fs_type(fd); + if (!fs_type || fs_type == TMPFS_MAGIC) + SKIP(return, "unsupported filesystem :%x\n", fs_type); + + addr = mmap(0, self->page_size, PROT_READ | PROT_WRITE, + MAP_SHARED, fd, 0); + if (addr == MAP_FAILED) + SKIP(return, "mmap failed, not enough memory.\n"); + memset(addr, 0xce, self->page_size); + fsync(fd); + + prepare(_metadata, self, addr); + + ret = sigsetjmp(signal_jmp_buf, 1); + if (!self->triggered) { + self->triggered = true; + ASSERT_EQ(variant->inject(self, addr), 0); + FORCE_READ(*addr); + } + + if (variant->type == MADV_HARD) + check(_metadata, self, addr, MADV_HARD_CLEAN_PAGECACHE, ret); + else + check(_metadata, self, addr, MADV_SOFT_CLEAN_PAGECACHE, ret); + + cleanup(_metadata, self, addr); + + ASSERT_EQ(munmap(addr, self->page_size), 0); + + ASSERT_EQ(close(fd), 0); +} + TEST_HARNESS_MAIN -- 2.33.0