The patch titled
Subject: mm: factor out the numa mapping rebuilding into a new helper
has been added to the -mm mm-unstable branch. Its filename is
mm-factor-out-the-numa-mapping-rebuilding-into-a-new-helper.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-factor-out-the-numa-mapping-rebuilding-into-a-new-helper.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Subject: mm: factor out the numa mapping rebuilding into a new helper
Date: Tue, 26 Mar 2024 19:51:24 +0800
Patch series "support multi-size THP numa balancing".
This patchset tries to support mTHP numa balancing, as a simple solution
to start, the NUMA balancing algorithm for mTHP will follow the THP
strategy as the basic support.
This patch (of 2):
To support large folio's numa balancing, factor out the numa mapping
rebuilding into a new helper as a preparation.
Link: https://lkml.kernel.org/r/cover.1711453317.git.baolin.wang@xxxxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/0c9df470bd2a62af8cc707cf01e42c7c744dd927.1711453317.git.baolin.wang@xxxxxxxxxxxxxxxxx
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 22 +++++++++++++++-------
1 file changed, 15 insertions(+), 7 deletions(-)
--- a/mm/memory.c~mm-factor-out-the-numa-mapping-rebuilding-into-a-new-helper
+++ a/mm/memory.c
@@ -5054,6 +5054,20 @@ int numa_migrate_prep(struct folio *foli
return mpol_misplaced(folio, vmf, addr);
}
+static void numa_rebuild_single_mapping(struct vm_fault *vmf, struct vm_area_struct *vma,
+ bool writable)
+{
+ pte_t pte, old_pte;
+
+ old_pte = ptep_modify_prot_start(vma, vmf->address, vmf->pte);
+ pte = pte_modify(old_pte, vma->vm_page_prot);
+ pte = pte_mkyoung(pte);
+ if (writable)
+ pte = pte_mkwrite(pte, vma);
+ ptep_modify_prot_commit(vma, vmf->address, vmf->pte, old_pte, pte);
+ update_mmu_cache_range(vmf, vma, vmf->address, vmf->pte, 1);
+}
+
static vm_fault_t do_numa_page(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
@@ -5159,13 +5173,7 @@ out_map:
* Make it present again, depending on how arch implements
* non-accessible ptes, some can allow access by kernel mode.
*/
- old_pte = ptep_modify_prot_start(vma, vmf->address, vmf->pte);
- pte = pte_modify(old_pte, vma->vm_page_prot);
- pte = pte_mkyoung(pte);
- if (writable)
- pte = pte_mkwrite(pte, vma);
- ptep_modify_prot_commit(vma, vmf->address, vmf->pte, old_pte, pte);
- update_mmu_cache_range(vmf, vma, vmf->address, vmf->pte, 1);
+ numa_rebuild_single_mapping(vmf, vma, writable);
pte_unmap_unlock(vmf->pte, vmf->ptl);
goto out;
}
_
Patches currently in -mm which might be from baolin.wang@xxxxxxxxxxxxxxxxx are
mm-record-the-migration-reason-for-struct-migration_target_control.patch
mm-hugetlb-make-the-hugetlb-migration-strategy-consistent.patch
docs-hugetlbpagerst-add-hugetlb-migration-description.patch
mm-factor-out-the-numa-mapping-rebuilding-into-a-new-helper.patch
mm-support-multi-size-thp-numa-balancing.patch
