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vm: object: add prefetch function to fetch missing pages

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This commit is contained in:
max 🍓
2026-04-30 19:09:41 +01:00
parent 607efa961f
commit d63c2dbd12
3 changed files with 78 additions and 9 deletions
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syscall/vm-object.c
+41 -9
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@@ -58,20 +58,31 @@ kern_status_t sys_vm_object_read(
struct object *obj = NULL;
handle_flags_t flags = 0;
unsigned long irq_flags = 0;
task_lock_irqsave(self, &irq_flags);
kern_status_t status = task_resolve_handle(self, object, &obj, &flags);
task_unlock_irqrestore(self, irq_flags);
put_current_task(self);
if (status != KERN_OK) {
put_current_task(self);
return status;
}
struct vm_object *vmo = vm_object_cast(obj);
if (!vmo) {
put_current_task(self);
object_unref(obj);
return KERN_INVALID_ARGUMENT;
}
status = vm_object_read(vmo, dst, offset, count, nr_read);
put_current_task(self);
vm_object_lock_irqsave(vmo, &irq_flags);
status = vm_object_prefetch(vmo, offset, count, &irq_flags);
if (status == KERN_OK) {
status = vm_object_read(vmo, dst, offset, count, nr_read);
}
vm_object_unlock_irqrestore(vmo, irq_flags);
object_unref(obj);
return status;
}
@@ -97,20 +108,25 @@ kern_status_t sys_vm_object_write(
struct object *obj = NULL;
handle_flags_t flags = 0;
unsigned long irq_flags = 0;
task_lock_irqsave(self, &irq_flags);
kern_status_t status = task_resolve_handle(self, object, &obj, &flags);
task_unlock_irqrestore(self, irq_flags);
put_current_task(self);
if (status != KERN_OK) {
put_current_task(self);
return status;
}
struct vm_object *vmo = vm_object_cast(obj);
if (!vmo) {
put_current_task(self);
return KERN_INVALID_ARGUMENT;
}
vm_object_lock_irqsave(vmo, &irq_flags);
status = vm_object_write(vmo, src, offset, count, nr_written);
put_current_task(self);
vm_object_unlock_irqrestore(vmo, irq_flags);
return status;
}
@@ -162,13 +178,28 @@ kern_status_t sys_vm_object_copy(
put_current_task(self);
struct vm_object *dst_vmo = vm_object_cast(dst_obj);
if (!dst_vmo) {
return KERN_INVALID_ARGUMENT;
}
struct vm_object *src_vmo = vm_object_cast(src_obj);
if (!dst_vmo || !src_vmo) {
object_unref(src_obj);
if (!src_vmo) {
object_unref(dst_obj);
return KERN_INVALID_ARGUMENT;
}
unsigned long irq_flags = 0;
vm_object_lock_irqsave(src_vmo, &irq_flags);
status = vm_object_prefetch(src_vmo, src_offset, count, &irq_flags);
vm_object_unlock_irqrestore(src_vmo, irq_flags);
if (status != KERN_OK) {
object_unref(src_obj);
object_unref(dst_obj);
return status;
}
vm_object_lock_pair_irqsave(src_vmo, dst_vmo, &irq_flags);
status = vm_object_copy(
dst_vmo,
dst_offset,
@@ -176,6 +207,7 @@ kern_status_t sys_vm_object_copy(
src_offset,
count,
nr_copied);
vm_object_unlock_pair_irqrestore(src_vmo, dst_vmo, irq_flags);
object_unref(src_obj);
object_unref(dst_obj);