* [PATCH] mm/vmalloc.c: optimize to reduce arguments of alloc_vmap_area()
@ 2024-03-09 4:44 Baoquan He
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From: Baoquan He @ 2024-03-09 4:44 UTC (permalink / raw)
To: linux-mm; +Cc: urezki, akpm, rulin.huang, Baoquan He
If called by __get_vm_area_node(), by open coding the field assignments
of 'struct vm_struct *vm', and move the vm->flags and vm->caller
assignments into __get_vm_area_node(), the passed in arguments 'flags'
and 'caller' can be removed.
This alleviates overloaded arguments passed in for alloc_vmap_area().
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
---
Note:
- This is made on top of Rulin's below v8 patch:
[PATCH v8] mm/vmalloc: Eliminated the lock contention from twice to once
mm/vmalloc.c | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 0fd8ebaad17b..0c738423976d 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1924,8 +1924,7 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
unsigned long align,
unsigned long vstart, unsigned long vend,
int node, gfp_t gfp_mask,
- unsigned long va_flags, struct vm_struct *vm,
- unsigned long flags, const void *caller)
+ unsigned long va_flags, struct vm_struct *vm)
{
struct vmap_node *vn;
struct vmap_area *va;
@@ -1988,8 +1987,11 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
va->vm = NULL;
va->flags = (va_flags | vn_id);
- if (vm)
- setup_vmalloc_vm(vm, va, flags, caller);
+ if (vm) {
+ vm->addr = (void *)va->va_start;
+ vm->size = va->va_end - va->va_start;
+ va->vm = vm;
+ }
vn = addr_to_node(va->va_start);
@@ -2565,8 +2567,7 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
va = alloc_vmap_area(VMAP_BLOCK_SIZE, VMAP_BLOCK_SIZE,
VMALLOC_START, VMALLOC_END,
node, gfp_mask,
- VMAP_RAM|VMAP_BLOCK, NULL,
- 0, NULL);
+ VMAP_RAM|VMAP_BLOCK, NULL);
if (IS_ERR(va)) {
kfree(vb);
return ERR_CAST(va);
@@ -2924,7 +2925,7 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node)
va = alloc_vmap_area(size, PAGE_SIZE,
VMALLOC_START, VMALLOC_END,
node, GFP_KERNEL, VMAP_RAM,
- NULL, 0, NULL);
+ NULL);
if (IS_ERR(va))
return NULL;
@@ -3063,7 +3064,10 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
if (!(flags & VM_NO_GUARD))
size += PAGE_SIZE;
- va = alloc_vmap_area(size, align, start, end, node, gfp_mask, 0, area, flags, caller);
+ area->flags = flags;
+ area->caller = caller;
+
+ va = alloc_vmap_area(size, align, start, end, node, gfp_mask, 0, area);
if (IS_ERR(va)) {
kfree(area);
return NULL;
--
2.41.0
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