* + mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch added to mm-new branch
@ 2026-06-25 2:57 Andrew Morton
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Morton @ 2026-06-25 2:57 UTC (permalink / raw)
To: mm-commits, xueyuan.chen21, will, urezki, ryan.roberts, rppt,
jiangwenxiaomi, jiangwen6, dev.jain, david, catalin.marinas,
anshuman.khandual, ajd, baohua, akpm
The patch titled
Subject: mm/vmalloc: align vm_area so vmap() can batch mappings
has been added to the -mm mm-new branch. Its filename is
mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch
This patch will later appear in the mm-new branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews. Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.
The mm-new branch of mm.git is not included in linux-next
If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: "Barry Song (Xiaomi)" <baohua@kernel.org>
Subject: mm/vmalloc: align vm_area so vmap() can batch mappings
Date: Thu, 18 Jun 2026 16:47:26 +0800
Try to align the vmap virtual address to PMD_SHIFT or a larger PTE mapping
size hinted by the architecture, so contiguous pages can be batch-mapped
when setting PMD or PTE entries.
Add __get_vm_area_node_aligned_caller() as a wrapper over
__get_vm_area_node() to simplify repeated calls with fixed arguments.
Link: https://lore.kernel.org/20260618084726.1070022-7-jiangwen6@xiaomi.com
Signed-off-by: Barry Song (Xiaomi) <baohua@kernel.org>
Signed-off-by: Wen Jiang <jiangwen6@xiaomi.com>
Tested-by: Xueyuan Chen <xueyuan.chen21@gmail.com>
Cc: Andrew Donnellan <ajd@linux.ibm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Uladzislau Rezki <urezki@gmail.com>
Cc: Wen Jiang <jiangwenxiaomi@gmail.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/vmalloc.c | 37 ++++++++++++++++++++++++++++++++++++-
1 file changed, 36 insertions(+), 1 deletion(-)
--- a/mm/vmalloc.c~mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings
+++ a/mm/vmalloc.c
@@ -3633,6 +3633,41 @@ out:
return err;
}
+static struct vm_struct *__get_vm_area_node_aligned_caller(unsigned long size,
+ unsigned long align, unsigned long flags, const void *caller)
+{
+ return __get_vm_area_node(size, align, PAGE_SHIFT, flags,
+ VMALLOC_START, VMALLOC_END,
+ NUMA_NO_NODE, GFP_KERNEL, caller);
+}
+
+static struct vm_struct *vmap_get_aligned_vm_area(unsigned long size,
+ unsigned long flags, const void *caller)
+{
+ struct vm_struct *vm_area;
+ unsigned int shift;
+
+ /* Try PMD alignment for large sizes */
+ if (size >= PMD_SIZE) {
+ vm_area = __get_vm_area_node_aligned_caller(size, PMD_SIZE,
+ flags, caller);
+ if (vm_area)
+ return vm_area;
+ }
+
+ /* Try CONT_PTE alignment */
+ shift = arch_vmap_pte_supported_shift(size);
+ if (shift > PAGE_SHIFT) {
+ vm_area = __get_vm_area_node_aligned_caller(size, 1UL << shift,
+ flags, caller);
+ if (vm_area)
+ return vm_area;
+ }
+
+ /* Fall back to page alignment */
+ return __get_vm_area_node_aligned_caller(size, PAGE_SIZE, flags, caller);
+}
+
/**
* vmap - map an array of pages into virtually contiguous space
* @pages: array of page pointers
@@ -3671,7 +3706,7 @@ void *vmap(struct page **pages, unsigned
return NULL;
size = (unsigned long)count << PAGE_SHIFT;
- area = get_vm_area_caller(size, flags, __builtin_return_address(0));
+ area = vmap_get_aligned_vm_area(size, flags, __builtin_return_address(0));
if (!area)
return NULL;
_
Patches currently in -mm which might be from baohua@kernel.org are
arm64-hugetlb-extend-batching-of-multiple-cont_pte-in-a-single-pte-setup.patch
arm64-vmalloc-allow-arch_vmap_pte_range_map_size-to-batch-multiple-cont_pte.patch
mm-vmalloc-extend-page-table-walk-to-support-larger-page_shift-sizes-and-eliminate-page-table-rewalk.patch
mm-vmalloc-map-contiguous-pages-in-batches-for-vmap-if-possible.patch
mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch
^ permalink raw reply [flat|nested] 2+ messages in thread
* + mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch added to mm-new branch
@ 2026-07-09 23:05 Andrew Morton
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Morton @ 2026-07-09 23:05 UTC (permalink / raw)
To: mm-commits, xueyuan.chen21, will, urezki, ryan.roberts, rppt,
leo.yan, jiangwenxiaomi, jiangwen6, dev.jain, david,
catalin.marinas, anshuman.khandual, ajd, baohua, akpm
The patch titled
Subject: mm/vmalloc: align vm_area so vmap() can batch mappings
has been added to the -mm mm-new branch. Its filename is
mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch
This patch will later appear in the mm-new branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews. Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.
The mm-new branch of mm.git is not included in linux-next
If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: "Barry Song (Xiaomi)" <baohua@kernel.org>
Subject: mm/vmalloc: align vm_area so vmap() can batch mappings
Date: Thu, 9 Jul 2026 15:38:23 +0800
Try to align the vmap virtual address to PMD_SHIFT or a larger PTE mapping
size hinted by the architecture, so contiguous pages can be batch-mapped
when setting PMD or PTE entries. We do not expect any significant
overhead for this.
Add __get_vm_area_node_aligned_caller() as a wrapper over
__get_vm_area_node() to simplify repeated calls with fixed arguments.
Link: https://lore.kernel.org/20260709073823.6643-7-jiangwen6@xiaomi.com
Signed-off-by: Barry Song (Xiaomi) <baohua@kernel.org>
Signed-off-by: Wen Jiang <jiangwen6@xiaomi.com>
Tested-by: Xueyuan Chen <xueyuan.chen21@gmail.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Andrew Donnellan <ajd@linux.ibm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Wen Jiang <jiangwenxiaomi@gmail.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/vmalloc.c | 35 ++++++++++++++++++++++++++++++++++-
1 file changed, 34 insertions(+), 1 deletion(-)
--- a/mm/vmalloc.c~mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings
+++ a/mm/vmalloc.c
@@ -3309,6 +3309,14 @@ struct vm_struct *get_vm_area_caller(uns
NUMA_NO_NODE, GFP_KERNEL, caller);
}
+static struct vm_struct *__get_vm_area_node_aligned_caller(unsigned long size,
+ unsigned long align, unsigned long flags, const void *caller)
+{
+ return __get_vm_area_node(size, align, PAGE_SHIFT, flags,
+ VMALLOC_START, VMALLOC_END,
+ NUMA_NO_NODE, GFP_KERNEL, caller);
+}
+
/**
* find_vm_area - find a continuous kernel virtual area
* @addr: base address
@@ -3632,6 +3640,30 @@ out:
return err;
}
+static struct vm_struct *vmap_get_aligned_vm_area(unsigned long size,
+ unsigned long flags, pgprot_t prot, const void *caller)
+{
+ struct vm_struct *vm_area;
+ unsigned int shift;
+
+ if (arch_vmap_pmd_supported(prot) && size >= PMD_SIZE) {
+ vm_area = __get_vm_area_node_aligned_caller(size, PMD_SIZE,
+ flags, caller);
+ if (vm_area)
+ return vm_area;
+ }
+
+ shift = arch_vmap_pte_supported_shift(size);
+ if (shift > PAGE_SHIFT) {
+ vm_area = __get_vm_area_node_aligned_caller(size, 1UL << shift,
+ flags, caller);
+ if (vm_area)
+ return vm_area;
+ }
+
+ return __get_vm_area_node_aligned_caller(size, PAGE_SIZE, flags, caller);
+}
+
/**
* vmap - map an array of pages into virtually contiguous space
* @pages: array of page pointers
@@ -3670,7 +3702,8 @@ void *vmap(struct page **pages, unsigned
return NULL;
size = (unsigned long)count << PAGE_SHIFT;
- area = get_vm_area_caller(size, flags, __builtin_return_address(0));
+ area = vmap_get_aligned_vm_area(size, flags, prot,
+ __builtin_return_address(0));
if (!area)
return NULL;
_
Patches currently in -mm which might be from baohua@kernel.org are
mm-avoid-unnecessary-lru-drain-for-wp_can_reuse_anon_folio.patch
mm-avoid-unnecessary-lru-drain-for-wp_can_reuse_anon_folio-fix.patch
mm-drop-stale-folio_ref_count==1-check-in-do_swap_page-reuse-logic.patch
mm-entirely-remove-lru_add_drain-in-do_swap_page.patch
mm-clarify-the-folio_free_swap-for-do_swap_page.patch
arm64-hugetlb-extend-batching-of-multiple-cont_pte-in-a-single-pte-setup.patch
arm64-vmalloc-allow-arch_vmap_pte_range_map_size-to-batch-multiple-cont_pte.patch
mm-vmalloc-extend-page-table-walk-to-support-larger-page_shift-sizes-and-eliminate-page-table-rewalk.patch
mm-vmalloc-map-contiguous-pages-in-batches-for-vmap-if-possible.patch
mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch
^ permalink raw reply [flat|nested] 2+ messages in thread
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