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McKenney" , Matthew Wilcox , Laurent Dufour , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra , Michel Lespinasse , Jerome Glisse , Minchan Kim , Joel Fernandes , Rom Lemarchand , Liam Howlett Subject: [PATCH v4 46/66] perf: Use VMA iterator Thread-Topic: [PATCH v4 46/66] perf: Use VMA iterator Thread-Index: AQHX5r/yrudiRO5KFEGLXGo6FgGccg== Date: Wed, 1 Dec 2021 14:30:11 +0000 Message-ID: <20211201142918.921493-47-Liam.Howlett@oracle.com> References: <20211201142918.921493-1-Liam.Howlett@oracle.com> In-Reply-To: <20211201142918.921493-1-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 x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: ba0fcdc4-7dc0-4d9c-cd53-08d9b4d7259c x-ms-traffictypediagnostic: SA2PR10MB4508: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:4502; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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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: SN6PR10MB3022.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: ba0fcdc4-7dc0-4d9c-cd53-08d9b4d7259c X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Dec 2021 14:30:11.4335 (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: imNN4nMP9RSePEHHfbNQLhU8RfbW8e6VTbURYVqtI718BpUxKuME+go0vpQ6ic+jn7fWiar3esjQVyWIKVbx8Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA2PR10MB4508 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10184 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxlogscore=999 phishscore=0 suspectscore=0 spamscore=0 adultscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112010082 X-Proofpoint-ORIG-GUID: LqVHJpqkWS5wfQXNFx4rCaNZqKcFYH6a X-Proofpoint-GUID: LqVHJpqkWS5wfQXNFx4rCaNZqKcFYH6a Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Liam R. Howlett" The VMA iterator is faster than the linked list and removing the linked list will shrink the vm_area_struct. Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Liam R. Howlett --- kernel/events/core.c | 3 ++- kernel/events/uprobes.c | 9 ++++++--- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 523106a506ee..d839ba79fe5c 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -10218,8 +10218,9 @@ static void perf_addr_filter_apply(struct perf_addr= _filter *filter, struct perf_addr_filter_range *fr) { struct vm_area_struct *vma; + VMA_ITERATOR(vmi, mm, 0); =20 - for (vma =3D mm->mmap; vma; vma =3D vma->vm_next) { + for_each_vma(vmi, vma) { if (!vma->vm_file) continue; =20 diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 6357c3580d07..5dee6c41f36d 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -356,9 +356,10 @@ static bool valid_ref_ctr_vma(struct uprobe *uprobe, static struct vm_area_struct * find_ref_ctr_vma(struct uprobe *uprobe, struct mm_struct *mm) { + VMA_ITERATOR(vmi, mm, 0); struct vm_area_struct *tmp; =20 - for (tmp =3D mm->mmap; tmp; tmp =3D tmp->vm_next) + for_each_vma(vmi, tmp) if (valid_ref_ctr_vma(uprobe, tmp)) return tmp; =20 @@ -1237,11 +1238,12 @@ int uprobe_apply(struct inode *inode, loff_t offset= , =20 static int unapply_uprobe(struct uprobe *uprobe, struct mm_struct *mm) { + VMA_ITERATOR(vmi, mm, 0); struct vm_area_struct *vma; int err =3D 0; =20 mmap_read_lock(mm); - for (vma =3D mm->mmap; vma; vma =3D vma->vm_next) { + for_each_vma(vmi, vma) { unsigned long vaddr; loff_t offset; =20 @@ -1989,9 +1991,10 @@ bool uprobe_deny_signal(void) =20 static void mmf_recalc_uprobes(struct mm_struct *mm) { + VMA_ITERATOR(vmi, mm, 0); struct vm_area_struct *vma; =20 - for (vma =3D mm->mmap; vma; vma =3D vma->vm_next) { + for_each_vma(vmi, vma) { if (!valid_vma(vma, false)) continue; /* --=20 2.30.2