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McKenney" , Matthew Wilcox , Laurent Dufour , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra , Michel Lespinasse , Liam Howlett Subject: [PATCH 29/94] mm/mmap: Change find_vma() to use the maple tree Thread-Topic: [PATCH 29/94] mm/mmap: Change find_vma() to use the maple tree Thread-Index: AQHXPEQzL9yMZm5bA0iNsNMj/1H8hg== Date: Wed, 28 Apr 2021 15:36:04 +0000 Message-ID: <20210428153542.2814175-30-Liam.Howlett@Oracle.com> References: <20210428153542.2814175-1-Liam.Howlett@Oracle.com> In-Reply-To: <20210428153542.2814175-1-Liam.Howlett@Oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.30.2 authentication-results: lists.infradead.org; dkim=none (message not signed) header.d=none;lists.infradead.org; dmarc=none action=none header.from=oracle.com; x-originating-ip: [23.233.25.87] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 42fa3815-5052-42fa-f1a0-08d90a5b5607 x-ms-traffictypediagnostic: CO1PR10MB4769: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7219; 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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: MWHPR10MB1582.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 42fa3815-5052-42fa-f1a0-08d90a5b5607 X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Apr 2021 15:36:04.3172 (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: G+SoPRaa4enkeXJ3zE6qidRyt5D5bQEqdzslpBoJSKEShrbO7OKMtmDmQLB0DvC12fdl5a+UsnWRv409Plniog== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO1PR10MB4769 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9968 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 malwarescore=0 mlxscore=0 mlxlogscore=999 bulkscore=0 phishscore=0 spamscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104280101 X-Proofpoint-GUID: s_GK-xeoQrzaetHTp3_lFzfCWh3SfSn6 X-Proofpoint-ORIG-GUID: s_GK-xeoQrzaetHTp3_lFzfCWh3SfSn6 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Start using the maple tree to find VMA entries in an mm_struct. Signed-off-by: Liam R. Howlett --- mm/mmap.c | 28 ++++++++++------------------ 1 file changed, 10 insertions(+), 18 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 112be171b662..3a9a9aee2f63 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2483,10 +2483,16 @@ get_unmapped_area(struct file *file, unsigned long = addr, unsigned long len, =20 EXPORT_SYMBOL(get_unmapped_area); =20 -/* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ +/** + * find_vma() - Find the VMA for a given address, or the next vma. + * @mm: The mm_struct to check + * @addr: The address + * + * Returns: The VMA associated with addr, or the next vma. + * May return %NULL in the case of no vma at addr or above. + */ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) { - struct rb_node *rb_node; struct vm_area_struct *vma; =20 /* Check the cache first. */ @@ -2494,24 +2500,10 @@ struct vm_area_struct *find_vma(struct mm_struct *m= m, unsigned long addr) if (likely(vma)) return vma; =20 - rb_node =3D mm->mm_rb.rb_node; - - while (rb_node) { - struct vm_area_struct *tmp; - - tmp =3D rb_entry(rb_node, struct vm_area_struct, vm_rb); - - if (tmp->vm_end > addr) { - vma =3D tmp; - if (tmp->vm_start <=3D addr) - break; - rb_node =3D rb_node->rb_left; - } else - rb_node =3D rb_node->rb_right; - } - + vma =3D mt_find(&mm->mm_mt, &addr, ULONG_MAX); if (vma) vmacache_update(addr, vma); + return vma; } EXPORT_SYMBOL(find_vma); --=20 2.30.2