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Thu, 15 Aug 2019 20:52:57 +0000 From: "Yang, Philip" To: "jglisse@redhat.com" , "alex.deucher@amd.com" , "amd-gfx@lists.freedesktop.org" , "Kuehling, Felix" , "jgg@mellanox.com" , "linux-mm@kvack.org" , "dri-devel@lists.freedesktop.org" CC: "Yang, Philip" Subject: [PATCH] mm/hmm: hmm_range_fault handle pages swapped out Thread-Topic: [PATCH] mm/hmm: hmm_range_fault handle pages swapped out Thread-Index: AQHVU6tqPJgEXxIoEkOKYOi6xfC1FQ== Date: Thu, 15 Aug 2019 20:52:56 +0000 Message-ID: <20190815205227.7949-1-Philip.Yang@amd.com> Accept-Language: en-ZA, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: YTOPR0101CA0005.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b00:15::18) To MWHPR12MB1374.namprd12.prod.outlook.com (2603:10b6:300:12::9) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Philip.Yang@amd.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.17.1 x-originating-ip: [165.204.55.251] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 2f8d6143-b673-4cde-427b-08d721c28ce4 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(4618075)(2017052603328)(7193020);SRVR:MWHPR12MB1887; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2f8d6143-b673-4cde-427b-08d721c28ce4 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Aug 2019 20:52:56.9914 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 46NYgjV4tUtv0I0bZh/M0nJmUqIDdw8QWunUXRRQV+OZRRkuLgh8Cf7HkQ/f/FeA X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR12MB1887 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: hmm_range_fault may return NULL pages because some of pfns are equal to HMM_PFN_NONE. This happens randomly under memory pressure. The reason is for swapped out page pte path, hmm_vma_handle_pte doesn't update fault variable from cpu_flags, so it failed to call hmm_vam_do_fault to swap the page in. The fix is to call hmm_pte_need_fault to update fault variable. Change-Id: I2e8611485563d11d938881c18b7935fa1e7c91ee Signed-off-by: Philip Yang --- mm/hmm.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/hmm.c b/mm/hmm.c index 9f22562e2c43..7ca4fb39d3d8 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -544,6 +544,9 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, uns= igned long addr, swp_entry_t entry =3D pte_to_swp_entry(pte); =20 if (!non_swap_entry(entry)) { + cpu_flags =3D pte_to_hmm_pfn_flags(range, pte); + hmm_pte_need_fault(hmm_vma_walk, orig_pfn, cpu_flags, + &fault, &write_fault); if (fault || write_fault) goto fault; return 0; --=20 2.17.1