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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 42/66] fs/proc/task_mmu: Stop using linked list and highest_vm_end Thread-Topic: [PATCH v4 42/66] fs/proc/task_mmu: Stop using linked list and highest_vm_end Thread-Index: AQHX5r/xefKkkGSxLEyfIjGHfmNy0g== Date: Wed, 1 Dec 2021 14:30:09 +0000 Message-ID: <20211201142918.921493-43-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: 1b4f391e-d94c-473c-2be7-08d9b4d7252d x-ms-traffictypediagnostic: SA2PR10MB4508: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:873; 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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: 1b4f391e-d94c-473c-2be7-08d9b4d7252d X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Dec 2021 14:30:09.9094 (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: LXO4K4czRth6l0xJb6XNttTcWIDuI35Yx+rjGKYwKlPQ4eesb8zkkaXMKYm+xmLsnSkGRoiprFx8cQbYmXCB2g== 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 suspectscore=0 spamscore=0 adultscore=0 bulkscore=0 malwarescore=0 mlxlogscore=999 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112010081 X-Proofpoint-GUID: 4-388LoRnQmcB9WC-ZlHqM-lAWIZ_AeP X-Proofpoint-ORIG-GUID: 4-388LoRnQmcB9WC-ZlHqM-lAWIZ_AeP Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Liam R. Howlett" Remove references to mm_struct linked list and highest_vm_end for when they are removed Signed-off-by: Liam R. Howlett --- fs/proc/internal.h | 2 +- fs/proc/task_mmu.c | 73 ++++++++++++++++++++++++++-------------------- 2 files changed, 42 insertions(+), 33 deletions(-) diff --git a/fs/proc/internal.h b/fs/proc/internal.h index 03415f3fb3a8..45b132c609ff 100644 --- a/fs/proc/internal.h +++ b/fs/proc/internal.h @@ -290,7 +290,7 @@ struct proc_maps_private { struct task_struct *task; struct mm_struct *mm; #ifdef CONFIG_MMU - struct vm_area_struct *tail_vma; + struct vma_iterator iter; #endif #ifdef CONFIG_NUMA struct mempolicy *task_mempolicy; diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 300911d6575f..7cc97cdb88c2 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -122,12 +122,26 @@ static void release_task_mempolicy(struct proc_maps_p= rivate *priv) } #endif =20 +static struct vm_area_struct *proc_get_vma(struct proc_maps_private *priv, + loff_t *ppos) +{ + struct vm_area_struct *vma =3D vma_next(&priv->iter); + + if (vma) { + *ppos =3D vma->vm_start; + } else { + *ppos =3D -2UL; + vma =3D get_gate_vma(priv->mm); + } + + return vma; +} + static void *m_start(struct seq_file *m, loff_t *ppos) { struct proc_maps_private *priv =3D m->private; unsigned long last_addr =3D *ppos; struct mm_struct *mm; - struct vm_area_struct *vma; =20 /* See m_next(). Zero at the start or after lseek. */ if (last_addr =3D=3D -1UL) @@ -151,31 +165,21 @@ static void *m_start(struct seq_file *m, loff_t *ppos= ) return ERR_PTR(-EINTR); } =20 + vma_iter_init(&priv->iter, mm, last_addr); hold_task_mempolicy(priv); - priv->tail_vma =3D get_gate_vma(mm); - - vma =3D find_vma(mm, last_addr); - if (vma) - return vma; + if (last_addr =3D=3D -2UL) + return get_gate_vma(mm); =20 - return priv->tail_vma; + return proc_get_vma(priv, ppos); } =20 static void *m_next(struct seq_file *m, void *v, loff_t *ppos) { - struct proc_maps_private *priv =3D m->private; - struct vm_area_struct *next, *vma =3D v; - - if (vma =3D=3D priv->tail_vma) - next =3D NULL; - else if (vma->vm_next) - next =3D vma->vm_next; - else - next =3D priv->tail_vma; - - *ppos =3D next ? next->vm_start : -1UL; - - return next; + if (*ppos =3D=3D -2UL) { + *ppos =3D -1UL; + return NULL; + } + return proc_get_vma(m->private, ppos); } =20 static void m_stop(struct seq_file *m, void *v) @@ -843,16 +847,16 @@ static int show_smaps_rollup(struct seq_file *m, void= *v) { struct proc_maps_private *priv =3D m->private; struct mem_size_stats mss; - struct mm_struct *mm; + struct mm_struct *mm =3D priv->mm; struct vm_area_struct *vma; - unsigned long last_vma_end =3D 0; + unsigned long vma_start =3D 0, last_vma_end =3D 0; int ret =3D 0; + MA_STATE(mas, &mm->mm_mt, 0, 0); =20 priv->task =3D get_proc_task(priv->inode); if (!priv->task) return -ESRCH; =20 - mm =3D priv->mm; if (!mm || !mmget_not_zero(mm)) { ret =3D -ESRCH; goto out_put_task; @@ -865,8 +869,13 @@ static int show_smaps_rollup(struct seq_file *m, void = *v) goto out_put_mm; =20 hold_task_mempolicy(priv); + vma =3D mas_find(&mas, 0); + + if (unlikely(!vma)) + goto empty_set; =20 - for (vma =3D priv->mm->mmap; vma;) { + vma_start =3D vma->vm_start; + do { smap_gather_stats(vma, &mss, 0); last_vma_end =3D vma->vm_end; =20 @@ -875,6 +884,7 @@ static int show_smaps_rollup(struct seq_file *m, void *= v) * access it for write request. */ if (mmap_lock_is_contended(mm)) { + mas_pause(&mas); mmap_read_unlock(mm); ret =3D mmap_read_lock_killable(mm); if (ret) { @@ -918,7 +928,7 @@ static int show_smaps_rollup(struct seq_file *m, void *= v) * contains last_vma_end. * Iterate VMA' from last_vma_end. */ - vma =3D find_vma(mm, last_vma_end - 1); + vma =3D mas_find(&mas, ULONG_MAX); /* Case 3 above */ if (!vma) break; @@ -932,11 +942,10 @@ static int show_smaps_rollup(struct seq_file *m, void= *v) smap_gather_stats(vma, &mss, last_vma_end); } /* Case 2 above */ - vma =3D vma->vm_next; - } + } while ((vma =3D mas_find(&mas, ULONG_MAX)) !=3D NULL); =20 - show_vma_header_prefix(m, priv->mm->mmap->vm_start, - last_vma_end, 0, 0, 0, 0); +empty_set: + show_vma_header_prefix(m, vma_start, last_vma_end, 0, 0, 0, 0); seq_pad(m, ' '); seq_puts(m, "[rollup]\n"); =20 @@ -1229,6 +1238,7 @@ static ssize_t clear_refs_write(struct file *file, co= nst char __user *buf, return -ESRCH; mm =3D get_task_mm(task); if (mm) { + MA_STATE(mas, &mm->mm_mt, 0, 0); struct mmu_notifier_range range; struct clear_refs_private cp =3D { .type =3D type, @@ -1248,7 +1258,7 @@ static ssize_t clear_refs_write(struct file *file, co= nst char __user *buf, } =20 if (type =3D=3D CLEAR_REFS_SOFT_DIRTY) { - for (vma =3D mm->mmap; vma; vma =3D vma->vm_next) { + mas_for_each(&mas, vma, ULONG_MAX) { if (!(vma->vm_flags & VM_SOFTDIRTY)) continue; vma->vm_flags &=3D ~VM_SOFTDIRTY; @@ -1260,8 +1270,7 @@ static ssize_t clear_refs_write(struct file *file, co= nst char __user *buf, 0, NULL, mm, 0, -1UL); mmu_notifier_invalidate_range_start(&range); } - walk_page_range(mm, 0, mm->highest_vm_end, &clear_refs_walk_ops, - &cp); + walk_page_range(mm, 0, -1, &clear_refs_walk_ops, &cp); if (type =3D=3D CLEAR_REFS_SOFT_DIRTY) { mmu_notifier_invalidate_range_end(&range); flush_tlb_mm(mm); --=20 2.30.2