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Kernel: Memory purging improvements

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This adds the ability for a Region to define volatile/nonvolatile
areas within mapped memory using madvise(). This also means that
memory purging takes into account all views of the PurgeableVMObject
and only purges memory that is not needed by all of them. When calling
madvise() to change an area to nonvolatile memory, return whether
memory from that area was purged. At that time also try to remap
all memory that is requested to be nonvolatile, and if insufficient
pages are available notify the caller of that fact.
This commit is contained in:
Tom 2020-09-02 22:57:09 -06:00 • committed by Andreas Kling
parent cf2c215def
commit bc5d6992a4
14 changed files with 655 additions and 62 deletions
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10
Kernel/Process.cpp
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@ -130,7 +130,7 @@ Range Process::allocate_range(VirtualAddress vaddr, size_t size, size_t alignmen
Region& Process::allocate_split_region(const Region& source_region, const Range& range, size_t offset_in_vmobject)
{
auto& region = add_region(Region::create_user_accessible(range, source_region.vmobject(), offset_in_vmobject, source_region.name(), source_region.access()));
auto& region = add_region(Region::create_user_accessible(this, range, source_region.vmobject(), offset_in_vmobject, source_region.name(), source_region.access()));
region.set_mmap(source_region.is_mmap());
region.set_stack(source_region.is_stack());
size_t page_offset_in_source_region = (offset_in_vmobject - source_region.offset_in_vmobject()) / PAGE_SIZE;
@ -145,7 +145,7 @@ Region* Process::allocate_region(const Range& range, const String& name, int pro
{
ASSERT(range.is_valid());
auto vmobject = AnonymousVMObject::create_with_size(range.size());
auto region = Region::create_user_accessible(range, vmobject, 0, name, prot_to_region_access_flags(prot));
auto region = Region::create_user_accessible(this, range, vmobject, 0, name, prot_to_region_access_flags(prot));
region->map(page_directory());
if (should_commit && !region->commit())
return nullptr;
@ -177,7 +177,7 @@ Region* Process::allocate_region_with_vmobject(const Range& range, NonnullRefPtr
return nullptr;
}
offset_in_vmobject &= PAGE_MASK;
auto& region = add_region(Region::create_user_accessible(range, move(vmobject), offset_in_vmobject, name, prot_to_region_access_flags(prot)));
auto& region = add_region(Region::create_user_accessible(this, range, move(vmobject), offset_in_vmobject, name, prot_to_region_access_flags(prot)));
region.map(page_directory());
return &region;
}
@ -762,7 +762,7 @@ size_t Process::amount_purgeable_volatile() const
size_t amount = 0;
ScopedSpinLock lock(m_lock);
for (auto& region : m_regions) {
if (region.vmobject().is_purgeable() && static_cast<const PurgeableVMObject&>(region.vmobject()).is_volatile())
if (region.vmobject().is_purgeable() && static_cast<const PurgeableVMObject&>(region.vmobject()).is_any_volatile())
amount += region.amount_resident();
}
return amount;
@ -773,7 +773,7 @@ size_t Process::amount_purgeable_nonvolatile() const
size_t amount = 0;
ScopedSpinLock lock(m_lock);
for (auto& region : m_regions) {
if (region.vmobject().is_purgeable() && !static_cast<const PurgeableVMObject&>(region.vmobject()).is_volatile())
if (region.vmobject().is_purgeable() && !static_cast<const PurgeableVMObject&>(region.vmobject()).is_any_volatile())
amount += region.amount_resident();
}
return amount;