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McKenney" , Matthew Wilcox , Laurent Dufour , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Rik van Riel , Peter Zijlstra , Michel Lespinasse , Jerome Glisse , Minchan Kim , Joel Fernandes , Rom Lemarchand Subject: Re: [PATCH v4 55/66] mm/mempolicy: Use maple tree iterators instead of vma linked list Thread-Topic: [PATCH v4 55/66] mm/mempolicy: Use maple tree iterators instead of vma linked list Thread-Index: AQHX5r/0Jk+tXlVP4UiIr9o8XNMVtqxsHKmAgAjUMIA= Date: Wed, 26 Jan 2022 02:48:26 +0000 Message-ID: <20220126024819.i35wd6uxh463wkps@revolver> References: <20211201142918.921493-1-Liam.Howlett@oracle.com> <20211201142918.921493-56-Liam.Howlett@oracle.com> <10798a7d-e157-03c2-abf4-f005a3507cae@suse.cz> In-Reply-To: <10798a7d-e157-03c2-abf4-f005a3507cae@suse.cz> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 4dd8daf2-ac70-4fb0-4bad-08d9e076539b x-ms-traffictypediagnostic: MWHPR10MB1694:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; 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charset="us-ascii" Content-ID: <0C7C9A388E876B488EAAD86F3A3F8E0C@namprd10.prod.outlook.com> 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: 4dd8daf2-ac70-4fb0-4bad-08d9e076539b X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Jan 2022 02:48:26.2147 (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: 5tM8xj6SuBhmj1WYJEN/KPahRetpC4NJnhSf4sxokllok5Jk1hFLp59Z4YpUGZq073jTXCA3ksNTlN6NQ8z1TA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR10MB1694 X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10238 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 mlxscore=0 malwarescore=0 spamscore=0 phishscore=0 suspectscore=0 adultscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2201260010 X-Proofpoint-ORIG-GUID: J6rxX2vvGhYrHSslbQRxvDIQOLtjpG05 X-Proofpoint-GUID: J6rxX2vvGhYrHSslbQRxvDIQOLtjpG05 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Vlastimil Babka [220120 06:58]: > On 12/1/21 15:30, Liam Howlett wrote: > > From: "Liam R. Howlett" > >=20 > > Signed-off-by: Matthew Wilcox (Oracle) > > Signed-off-by: Liam R. Howlett > > --- > > mm/mempolicy.c | 53 ++++++++++++++++++++++++++------------------------ > > 1 file changed, 28 insertions(+), 25 deletions(-) > >=20 > > diff --git a/mm/mempolicy.c b/mm/mempolicy.c > > index 10e9c87260ed..0e2d918f4f30 100644 > > --- a/mm/mempolicy.c > > +++ b/mm/mempolicy.c > > @@ -377,9 +377,10 @@ void mpol_rebind_task(struct task_struct *tsk, con= st nodemask_t *new) > > void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) > > { > > struct vm_area_struct *vma; > > + MA_STATE(mas, &mm->mm_mt, 0, 0); >=20 > VMA_ITERATOR? Yes, I will make this change. Thanks. >=20 > > =20 > > mmap_write_lock(mm); > > - for (vma =3D mm->mmap; vma; vma =3D vma->vm_next) > > + mas_for_each(&mas, vma, ULONG_MAX) > > mpol_rebind_policy(vma->vm_policy, new); > > mmap_write_unlock(mm); > > } > > @@ -652,7 +653,7 @@ static unsigned long change_prot_numa(struct vm_are= a_struct *vma, > > static int queue_pages_test_walk(unsigned long start, unsigned long en= d, > > struct mm_walk *walk) > > { > > - struct vm_area_struct *vma =3D walk->vma; > > + struct vm_area_struct *next, *vma =3D walk->vma; > > struct queue_pages *qp =3D walk->private; > > unsigned long endvma =3D vma->vm_end; > > unsigned long flags =3D qp->flags; > > @@ -667,9 +668,10 @@ static int queue_pages_test_walk(unsigned long sta= rt, unsigned long end, > > /* hole at head side of range */ > > return -EFAULT; > > } > > + next =3D find_vma(vma->vm_mm, vma->vm_end); > > if (!(flags & MPOL_MF_DISCONTIG_OK) && > > ((vma->vm_end < qp->end) && > > - (!vma->vm_next || vma->vm_end < vma->vm_next->vm_start))) > > + (!next || vma->vm_end < next->vm_start))) > > /* hole at middle or tail of range */ > > return -EFAULT; > > =20 > > @@ -783,28 +785,24 @@ static int vma_replace_policy(struct vm_area_stru= ct *vma, > > static int mbind_range(struct mm_struct *mm, unsigned long start, > > unsigned long end, struct mempolicy *new_pol) > > { > > - struct vm_area_struct *next; > > + MA_STATE(mas, &mm->mm_mt, start - 1, start - 1); > > struct vm_area_struct *prev; > > struct vm_area_struct *vma; > > int err =3D 0; > > pgoff_t pgoff; > > - unsigned long vmstart; > > - unsigned long vmend; > > - > > - vma =3D find_vma(mm, start); > > - VM_BUG_ON(!vma); > > =20 > > - prev =3D vma->vm_prev; > > - if (start > vma->vm_start) > > - prev =3D vma; > > + prev =3D mas_find_rev(&mas, 0); > > + if (prev && (start < prev->vm_end)) > > + vma =3D prev; > > + else > > + vma =3D mas_next(&mas, end - 1); > > =20 > > - for (; vma && vma->vm_start < end; prev =3D vma, vma =3D next) { > > - next =3D vma->vm_next; > > - vmstart =3D max(start, vma->vm_start); > > - vmend =3D min(end, vma->vm_end); > > + do { > > + unsigned long vmstart =3D max(start, vma->vm_start); > > + unsigned long vmend =3D min(end, vma->vm_end); >=20 > What if vma is null? Shouldn't this rather be a "for (; vma; vma =3D > mas_next(...)" We have already found the vma above. I am re-using the maple state to save walking the tree. I will re-add the VM_BUG_ON(!vma), but I think it's more efficient the way it is. >=20 > > =20 > > if (mpol_equal(vma_policy(vma), new_pol)) > > - continue; > > + goto next; > > =20 > > pgoff =3D vma->vm_pgoff + > > ((vmstart - vma->vm_start) >> PAGE_SHIFT); > > @@ -812,8 +810,8 @@ static int mbind_range(struct mm_struct *mm, unsign= ed long start, > > vma->anon_vma, vma->vm_file, pgoff, > > new_pol, vma->vm_userfaultfd_ctx); > > if (prev) { > > + mas_pause(&mas); > > vma =3D prev; > > - next =3D vma->vm_next; > > if (mpol_equal(vma_policy(vma), new_pol)) > > continue; > > /* vma_merge() joined vma && vma->next, case 8 */ > > @@ -823,19 +821,23 @@ static int mbind_range(struct mm_struct *mm, unsi= gned long start, > > err =3D split_vma(vma->vm_mm, vma, vmstart, 1); > > if (err) > > goto out; > > + mas_pause(&mas); > > } > > if (vma->vm_end !=3D vmend) { > > err =3D split_vma(vma->vm_mm, vma, vmend, 0); > > if (err) > > goto out; > > + /* mas_pause() unnecessary as the loop is ending */ > > } > > - replace: > > +replace: > > err =3D vma_replace_policy(vma, new_pol); > > if (err) > > goto out; > > - } > > +next: > > + prev =3D vma; > > + } while ((vma =3D mas_next(&mas, end - 1)) !=3D NULL); > > =20 > > - out: > > +out: > > return err; > > } > > =20 > > @@ -1053,6 +1055,7 @@ static int migrate_to_node(struct mm_struct *mm, = int source, int dest, > > int flags) > > { > > nodemask_t nmask; > > + struct vm_area_struct *vma; > > LIST_HEAD(pagelist); > > int err =3D 0; > > struct migration_target_control mtc =3D { > > @@ -1068,8 +1071,9 @@ static int migrate_to_node(struct mm_struct *mm, = int source, int dest, > > * need migration. Between passing in the full user address > > * space range and MPOL_MF_DISCONTIG_OK, this call can not fail. > > */ > > + vma =3D find_vma(mm, 0); > > VM_BUG_ON(!(flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))); > > - queue_pages_range(mm, mm->mmap->vm_start, mm->task_size, &nmask, > > + queue_pages_range(mm, vma->vm_start, mm->task_size, &nmask, > > flags | MPOL_MF_DISCONTIG_OK, &pagelist); > > =20 > > if (!list_empty(&pagelist)) { > > @@ -1198,13 +1202,12 @@ static struct page *new_page(struct page *page,= unsigned long start) > > { > > struct vm_area_struct *vma; > > unsigned long address; > > + MA_STATE(mas, ¤t->mm->mm_mt, start, start); > > =20 > > - vma =3D find_vma(current->mm, start); > > - while (vma) { > > + mas_for_each(&mas, vma, ULONG_MAX) { > > address =3D page_address_in_vma(page, vma); > > if (address !=3D -EFAULT) > > break; > > - vma =3D vma->vm_next; > > } > > =20 > > if (PageHuge(page)) { > =