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Kernel: Set up Regions before adding them to a Process's AddressSpace

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This reduces the amount of time in which not fully-initialized Regions
are present inside an AddressSpace's region tree.
This commit is contained in:
Idan Horowitz 2022-02-10 19:55:10 +02:00
parent d9d3362722
commit 57bce8ab97
Notes: sideshowbarker 2024-07-17 19:01:40 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/57bce8ab97
Pull-request: https://github.com/SerenityOS/serenity/pull/12422
2 changed files with 10 additions and 12 deletions
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20
Kernel/Memory/AddressSpace.cpp
View File

@ -146,16 +146,15 @@ ErrorOr<Region*> AddressSpace::try_allocate_split_region(Region const& source_re
auto new_region = TRY(Region::try_create_user_accessible(
range, source_region.vmobject(), offset_in_vmobject, move(region_name), source_region.access(), source_region.is_cacheable() ? Region::Cacheable::Yes : Region::Cacheable::No, source_region.is_shared()));
auto* region = TRY(add_region(move(new_region)));
region->set_syscall_region(source_region.is_syscall_region());
region->set_mmap(source_region.is_mmap());
region->set_stack(source_region.is_stack());
new_region->set_syscall_region(source_region.is_syscall_region());
new_region->set_mmap(source_region.is_mmap());
new_region->set_stack(source_region.is_stack());
size_t page_offset_in_source_region = (offset_in_vmobject - source_region.offset_in_vmobject()) / PAGE_SIZE;
for (size_t i = 0; i < region->page_count(); ++i) {
for (size_t i = 0; i < new_region->page_count(); ++i) {
if (source_region.should_cow(page_offset_in_source_region + i))
TRY(region->set_should_cow(i, true));
TRY(new_region->set_should_cow(i, true));
}
return region;
return add_region(move(new_region));
}
ErrorOr<Region*> AddressSpace::allocate_region(VirtualRange const& range, StringView name, int prot, AllocationStrategy strategy)
@ -191,16 +190,15 @@ ErrorOr<Region*> AddressSpace::allocate_region_with_vmobject(VirtualRange const&
if (!name.is_null())
region_name = TRY(KString::try_create(name));
auto region = TRY(Region::try_create_user_accessible(range, move(vmobject), offset_in_vmobject, move(region_name), prot_to_region_access_flags(prot), Region::Cacheable::Yes, shared));
auto* added_region = TRY(add_region(move(region)));
if (prot == PROT_NONE) {
// For PROT_NONE mappings, we don't have to set up any page table mappings.
// We do still need to attach the region to the page_directory though.
SpinlockLocker mm_locker(s_mm_lock);
added_region->set_page_directory(page_directory());
region->set_page_directory(page_directory());
} else {
TRY(added_region->map(page_directory(), ShouldFlushTLB::No));
TRY(region->map(page_directory(), ShouldFlushTLB::No));
}
return added_region;
return add_region(move(region));
}
void AddressSpace::deallocate_region(Region& region)

2
Kernel/Syscalls/fork.cpp
View File

@ -106,8 +106,8 @@ ErrorOr<FlatPtr> Process::sys$fork(RegisterState& regs)
for (auto& region : address_space().regions()) {
dbgln_if(FORK_DEBUG, "fork: cloning Region({}) '{}' @ {}", region, region->name(), region->vaddr());
auto region_clone = TRY(region->try_clone());
TRY(region_clone->map(child->address_space().page_directory(), Memory::ShouldFlushTLB::No));
auto* child_region = TRY(child->address_space().add_region(move(region_clone)));
TRY(child_region->map(child->address_space().page_directory(), Memory::ShouldFlushTLB::No));
if (region == m_master_tls_region.unsafe_ptr())
child->m_master_tls_region = child_region;