Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Liam Howlett <liam.howlett@oracle.com>
To:     "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        "damon @ lists . linux . dev" <damon@lists.linux.dev>,
        SeongJae Park <sj@kernel.org>,
        David Hildenbrand <david@redhat.com>
Subject: [PATCH v10 20/69] mm: optimize find_exact_vma() to use vma_lookup()
Thread-Topic: [PATCH v10 20/69] mm: optimize find_exact_vma() to use
 vma_lookup()
Thread-Index: AQHYhbAMk+GOApWXp0qs8SWLlVl5QQ==
Date:   Tue, 21 Jun 2022 20:46:57 +0000
Message-ID: <20220621204632.3370049-21-Liam.Howlett@oracle.com>
References: <20220621204632.3370049-1-Liam.Howlett@oracle.com>
In-Reply-To: <20220621204632.3370049-1-Liam.Howlett@oracle.com>
Accept-Language: en-US
Content-Language: en-US
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?iso-8859-1?Q?XrN6EuoeBxUaAZB6Kd3ku98XuhLMiXboGzt42pmoQEvFA+Byms3jAX4a6x?=
 =?iso-8859-1?Q?2eLPG8yAN7pvno4g939ojkdznu8UNS4Jk/Du32cpYo/iNwKK0wUsYafYyZ?=
 =?iso-8859-1?Q?gqDbSzHAmNz3JoavlBEuet2Ns01ForfnWOYlkkbF+e+Ywv3XyHibwSI5dl?=
 =?iso-8859-1?Q?OwVoI1dVKwXsgEEpan/isctG1KUtwX/NBj6iajOXq9z4GcSF1APGvajSK9?=
 =?iso-8859-1?Q?YNbJNFqh99tGTOr1ikGrvWAQU+ZmT4J2tKdWy9s8dhalVNYFD+vYSINvW1?=
 =?iso-8859-1?Q?8nd1QHrxZ2Cz5vJvBY/NSb8GNdLxOpy8H8nN8ldVi+Rx0+GB0NFQelFodA?=
 =?iso-8859-1?Q?3QAW/WF7g0N9WSllsKDLfVodpPEvAMN6/HLjF0BjE/2pSc4bMpZAuZjU4S?=
 =?iso-8859-1?Q?UXDJW8rARJJ61PceWgbw5ukxgs7Xr+/tl8Iy3xZ0Rnxa8wi4z7d/xxJt9l?=
 =?iso-8859-1?Q?070jqDeAO8xMHf/gehkLTrc+me5Om5B3Y3aqSaAI1sC55+6QNjqOAvtOPg?=
 =?iso-8859-1?Q?3QRu/ZSoSJC9dnVuILZS2qCTvhGulhSLXZZc6omQzBdEJuw/oaLV0TfdTN?=
 =?iso-8859-1?Q?FNTpRLeB6KjS1i3VJ7biNYY0YJagCRT0K/5ae4LXvBxmExEdp/UrVMVy0w?=
 =?iso-8859-1?Q?NgRoOq0Klu0yqaJSyUquZ4NCNTN8TXtJIt/njDXwHLNBff/kQ53yBS5MiJ?=
 =?iso-8859-1?Q?9Eji+Zqrn9TzUzAP+bpvBZxNBnldj+EfLXGNnpPjvdiTYgzhO2QfaoT6Ox?=
 =?iso-8859-1?Q?lmrKOh3rXI0cA/OC93MldJNTFncHiNHScLqcxhQYKT94ET79j7nW5Plp/p?=
 =?iso-8859-1?Q?SJxZ+l6d+F1LSGcKIukSKCE+ooT9MJnPFT/bhFB5vCObLz2TPl6e1QeReA?=
 =?iso-8859-1?Q?0sr+UCzj14iWDhgihChUBJ3A1N8C+0Hw4AVAgCWcF0rQY4n1LIQsO2fpOM?=
 =?iso-8859-1?Q?0iRjcVsPZsFrvIZ03j1Eq1zrmaWyJvHT+DmxYoaoMgRY9ihrE0owZ7ANjc?=
 =?iso-8859-1?Q?SC71vgSD3CtpWPOzBSLFCme6gDRdVWTi4mAfRI3We5jVM5UTUbfa9KH3kO?=
 =?iso-8859-1?Q?VCDfJVxMM9qlWX6MYj1R4e/Oeh6oBAn8Dg0tOhZPTB3hgsJDFV4R5usTt7?=
 =?iso-8859-1?Q?8vROobRj0p5FNA+4jIFpg2nQ67rv6GeI8hX5sth2hk4wdv9pe+q9FIXC/n?=
 =?iso-8859-1?Q?AE6re3P2TJ6YpgXLhPzDYCKbpkyByaJSqFf3MlM7XuyTOvFjWJd+CWBg7d?=
 =?iso-8859-1?Q?WbjKf/EeHnsrSKcgbxmzr4w5tIzV9hiS2/2UNZ+RifzWYtqZQ68gB8he38?=
 =?iso-8859-1?Q?wGTLUis613l8zJO9NdYN/ejhgHLwrVkXVBgp+i5rfFMYvaK1ILMK1gVJVJ?=
 =?iso-8859-1?Q?9uz3ucRyHn+m97Yn0rrizLuqbZLYSNJxWO1iQ8zA9uyR1l2huOwMLccQeQ?=
 =?iso-8859-1?Q?JohImJKbhU46TJ9Whsf7xLmyd9ORqSlGwEKFwZYcOd1B4Y4/TlKoTXBmCE?=
 =?iso-8859-1?Q?rHi3sUezgFk5hxnKuTx1+sF9O3UEfh7SuDAxz1nZ7U23DhhD6I9ya3U0rh?=
 =?iso-8859-1?Q?fmAciup2VJDZzdgg2Xr8rCRaIVMpG90HVKzJ7BQ1okkHaWy581mKBYLVJ+?=
 =?iso-8859-1?Q?sBusqsWUI+t05lnouhtJeo059m4N9o+Q+KMW8CemhM0g2h3YoxEgHJuQ+Y?=
 =?iso-8859-1?Q?GO1fr/QJagtwvLBqO40XFtq+NffQf1L3rjR3cQNu+yi5i2LlniivITRycZ?=
 =?iso-8859-1?Q?xyqEQnkaHOkfVbsr1TH2CEpM82M8CZUTPpFn4mZK3Yecwia5848LdkY5mM?=
 =?iso-8859-1?Q?Vrh+T3F3WT2oElG3XA5GpPbq+TGW1EA=3D?=
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-OriginatorOrg: oracle.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: SN6PR10MB3022.namprd10.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 0eca6cd3-1cbe-432b-30e5-08da53c734c6
X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jun 2022 20:46:57.8322
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: nP0OuUbl6bchBLXv5J6wAJKP45CEM5dxzZ1nfpWJlF94MoYIUuO6SodUbsw0bWLio0TMzRbGBh9ucqlQCfphzA==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR10MB3085
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.517,18.0.883
 definitions=2022-06-21_09:2022-06-21,2022-06-21 signatures=0
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 malwarescore=0 mlxscore=0
 phishscore=0 adultscore=0 suspectscore=0 mlxlogscore=593 bulkscore=0
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2204290000
 definitions=main-2206210087
X-Proofpoint-GUID: WeCKLbd0RxKblkQ-6vLkoYB1hYV0R6mK
X-Proofpoint-ORIG-GUID: WeCKLbd0RxKblkQ-6vLkoYB1hYV0R6mK
X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,DKIM_SIGNED,
        DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW,
        RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE
        autolearn=ham autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
        lindbergh.monkeyblade.net
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

Use vma_lookup() to walk the tree to the start value requested.  If the
vma at the start does not match, then the answer is NULL and there is no
need to look at the next vma the way that find_vma() would.

Link: https://lkml.kernel.org/r/20220504011345.662299-5-Liam.Howlett@oracle=
.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 include/linux/mm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 6b84dbdb8e9f..f15301bd7f99 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2863,7 +2863,7 @@ static inline unsigned long vma_pages(struct vm_area_=
struct *vma)
 static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
 				unsigned long vm_start, unsigned long vm_end)
 {
-	struct vm_area_struct *vma =3D find_vma(mm, vm_start);
+	struct vm_area_struct *vma =3D vma_lookup(mm, vm_start);
=20
 	if (vma && (vma->vm_start !=3D vm_start || vma->vm_end !=3D vm_end))
 		vma =3D NULL;
--=20
2.35.1