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Wed, 4 Feb 2026 15:19:16 +0800 (CST) Received: from dggemv705-chm.china.huawei.com (unknown [10.3.19.32]) by mail.maildlp.com (Postfix) with ESMTPS id E89014056C; Wed, 4 Feb 2026 15:23:05 +0800 (CST) Received: from kwepemq500010.china.huawei.com (7.202.194.235) by dggemv705-chm.china.huawei.com (10.3.19.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Wed, 4 Feb 2026 15:23:05 +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; Wed, 4 Feb 2026 15:23:04 +0800 From: Miaohe Lin To: , CC: , , , , , , , , , , , , Subject: [PATCH v3 2/3] selftests/mm: add memory failure clean pagecache test Date: Wed, 4 Feb 2026 15:33:30 +0800 Message-ID: <20260204073331.899406-3-linmiaohe@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20260204073331.899406-1-linmiaohe@huawei.com> References: <20260204073331.899406-1-linmiaohe@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.173.125.37] X-ClientProxiedBy: kwepems500002.china.huawei.com (7.221.188.17) To kwepemq500010.china.huawei.com (7.202.194.235) X-Rspamd-Server: rspam11 X-Stat-Signature: cb7dafxs9qa7b8an1p3irnmj3swgx6gj X-Rspam-User: X-Rspamd-Queue-Id: 89E371C0003 X-HE-Tag: 1770189789-255006 X-HE-Meta: U2FsdGVkX19y4VfqEGRIckBW4hAD4RQcUZXPipJD/ukd5mVF3EAzegw034WrvahEML6TmPV34FDFHhu4gmIlagGzbC6Try8SSgTLajQvossSKAF3/CQCRAEn2dNJb61y9vPU2ZHhuUA2m2oG2LbpTcflSGHQXQaXHys1HESmVFYGoC+oxFEn7gUTABahBnRmtw6FKmphu1B7TSo28h++wbA+NU6wT+ysKgyYMIQwDLTh7eEzFuF8NKDSuz4OXSHjttMPs0BcALo835pCx2kQ+nsU9bfOCRvfoaDhGWNjKluPKhHkcJjD7hz9ALeZc47g+Me7mu7IgCterX93r8iXHaFM1gy7DM2REsAxc1rPXl7u9MAd64xnc2LooRFzfzFCPw+0thnc0CGkUN3qIlKn052SDPXq4Djy0YiQITuvyjaww2qy9sSZ+uPjvLhvPiRr+RovvWA09gUqsAf8/NPyHt78TYkw7cRN/ZQ4bybBkMt00iwJyGIVx9bZ6R4PiHqrm54vgbrGeF61uOJ2O8YVW0NaRyKG6lMRoraqSfVwJaSQU2VC9hplYPYe0gaHdUDct9eFPYl2aspMOgz2f3lesQJRseirL1Uqc/8dFF9fHIOLX7X3FzyovFEMS6zxs4OZHWoAQ3+3w/TsdCV6CrOETBj4saD1qMo8adE3WrNAx+H2Z14gporWXyqfmBPln/JL7lpO4jisMcw8YIGO1Td16y73vvx6vCwqR+/ldQokdIvPWoXFgsKihrA24kzIurFEDqIrGGDXEouvJBYJiJkTgY84G0Bk59DO32Ya3mbxU89eUAYTRdLTXkU5SZb6G17QFHAmdcg99U8ZfnwU0zZcYw/qC5AgyJGTvrX9QbVcDIb7+947BFCpqmj7HmIUmfX7b70gwGYCjdEjqzvho2MuOTNWz00epF/hKvkjEILeqN5vzK6mMKh4thapIp5lpASIrRg6pYBEefpIM04Gxhr 3F4Zq7Qk 7TdEsI763QsWgkWHOnDsp1tQQytethMgjYBkhgdBGzG0a11ZGNDnKXZTK/mSDOGjx59KyVYOf2TgnfwTWfBHX5XVaiaU7Kv/7bBUjD7OI5nN1VsAzzXSjQ7dVbF4EhaeB7fvq0VHofkkImyeM8RP/rnjDvBwF0e7O0zvJhYCLZB/pq7KQVohlGW9Q0CHZY7zYPbHB+2o6PQNkmY7GzNZsu6tQ24+aiqZIyJO0NYLyw3c0IcFGClh++IheaFg3p1ybnoTuLhkj1tCuh9LeV8hrr07IXKrFQjqQpPFuujgO5Th0ZPRdKgrCmMel6nsrVCCN5qYUySUXxL71WFlgUoB859UdXeD2Wb38JbijckZzJXfxPzzM+48XpgSWmEM+lFXhc64my54kI48NjUw= 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. 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