From nobody Mon Feb 9 08:56:05 2026 Received: from canpmsgout12.his.huawei.com (canpmsgout12.his.huawei.com [113.46.200.227]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B060438BF96; Wed, 4 Feb 2026 07:23:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=113.46.200.227 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770189796; cv=none; b=L00dvT5Vj4WF+pmG4dqM4C2inG9WJzSeOfw1OHABvIwOGky/BwOGBpjJ/LjS7jbYp53Pb6gAU51/75hE2q8xqMXHOIz7W+FY7e3217aLsZ8Ql6kX8/wzjucxC2k5AikJg85YaKvT1bTYsG4csIj9RdqrKJsxKO8tJ6ifkkX/NK4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770189796; c=relaxed/simple; bh=9qtla54scmE5/SKXd7Xfi04ucn5aUqxqDkRQZzAxGz0=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=QTTNpYBrK+64rEvkqotDp62bnq4pK5n0MIduOM9LVdHJJacVx6A8eGVEHGrkpRerVz/zu2AS5W208QUe2RhEj7rUm01JU+zhCI1w8IjmCkiNcJfZkWS/hxirtVkNap4PTL87re5LE3hlQw9VlkmjZZQDtEWuOIQwxOaiGLkvMyc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b=OV9KX8k3; arc=none smtp.client-ip=113.46.200.227 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b="OV9KX8k3" dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=6WZHqA9lPqKkrjMNeQLv05dYJq5dmAwXW8jYtq6upg0=; b=OV9KX8k3v9BN3RXwOqFiih7lcukz69wbyhF0+qUr7bwJNmRpnFjYtGQYwW7KYgiddrBvJd7vX XzXwR5w/Kst55MneSHY6j4PgEOqQaYYlYe6N6b9FmdhXgcl5NSSHIc3JJSyR8Y9CY3+dVSjwEWi qLGeXOws9M5fQ3o6KgYvvX8= Received: from mail.maildlp.com (unknown [172.19.163.214]) by canpmsgout12.his.huawei.com (SkyGuard) with ESMTPS id 4f5Wtr0K5TznTWL; 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: kwepems500002.china.huawei.com (7.221.188.17) To kwepemq500010.china.huawei.com (7.202.194.235) Content-Type: text/plain; charset="utf-8" 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/se= lftests/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 =20 #include "vm_util.h" =20 @@ -24,7 +28,9 @@ enum inject_type { =20 enum result_type { MADV_HARD_ANON, + MADV_HARD_CLEAN_PAGECACHE, MADV_SOFT_ANON, + MADV_SOFT_CLEAN_PAGECACHE, }; =20 static jmp_buf signal_jmp_buf; @@ -154,6 +160,8 @@ static void check(struct __test_metadata *_metadata, FI= XTURE_DATA(memory_failure =20 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); =20 @@ -236,4 +244,62 @@ TEST_F(memory_failure, anon) ASSERT_EQ(munmap(addr, self->page_size), 0); } =20 +/* Borrowed from mm/gup_longterm.c. */ +static int get_fs_type(int fd) +{ + struct statfs fs; + int ret; + + do { + ret =3D fstatfs(fd, &fs); + } while (ret && errno =3D=3D EINTR); + + return ret ? 0 : (int)fs.f_type; +} + +TEST_F(memory_failure, clean_pagecache) +{ + const char *fname =3D "./clean-page-cache-test-file"; + int fd; + char *addr; + int ret; + int fs_type; + + fd =3D 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 =3D get_fs_type(fd); + if (!fs_type || fs_type =3D=3D TMPFS_MAGIC) + SKIP(return, "unsupported filesystem :%x\n", fs_type); + + addr =3D mmap(0, self->page_size, PROT_READ | PROT_WRITE, + MAP_SHARED, fd, 0); + if (addr =3D=3D MAP_FAILED) + SKIP(return, "mmap failed, not enough memory.\n"); + memset(addr, 0xce, self->page_size); + fsync(fd); + + prepare(_metadata, self, addr); + + ret =3D sigsetjmp(signal_jmp_buf, 1); + if (!self->triggered) { + self->triggered =3D true; + ASSERT_EQ(variant->inject(self, addr), 0); + FORCE_READ(*addr); + } + + if (variant->type =3D=3D 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 --=20 2.33.0