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Kernel: Use KString for Region names

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Replace the AK::String used for Region::m_name with a KString.

This seems beneficial across the board, but as a specific data point,
it reduces time spent in sys$set_mmap_name() by ~50% on test-js. :^)
This commit is contained in:
Andreas Kling 2021-05-28 09:33:14 +02:00
parent a1944ec966
commit fc9ce22981
10 changed files with 64 additions and 62 deletions
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14
Kernel/VM/Region.h
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@ -8,11 +8,11 @@
#include <AK/EnumBits.h>
#include <AK/IntrusiveList.h>
#include <AK/String.h>
#include <AK/WeakPtr.h>
#include <AK/Weakable.h>
#include <Kernel/Arch/x86/CPU.h>
#include <Kernel/Heap/SlabAllocator.h>
#include <Kernel/KString.h>
#include <Kernel/VM/PageFaultResponse.h>
#include <Kernel/VM/PurgeablePageRanges.h>
#include <Kernel/VM/RangeAllocator.h>
@ -50,8 +50,8 @@ public:
Yes,
};
static NonnullOwnPtr<Region> create_user_accessible(Process*, const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, String name, Region::Access access, Cacheable, bool shared);
static NonnullOwnPtr<Region> create_kernel_only(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, String name, Region::Access access, Cacheable = Cacheable::Yes);
static NonnullOwnPtr<Region> create_user_accessible(Process*, const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, OwnPtr<KString> name, Region::Access access, Cacheable, bool shared);
static NonnullOwnPtr<Region> create_kernel_only(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, OwnPtr<KString> name, Region::Access access, Cacheable = Cacheable::Yes);
~Region();
@ -67,10 +67,10 @@ public:
bool has_been_executable() const { return m_access & Access::HasBeenExecutable; }
bool is_cacheable() const { return m_cacheable; }
const String& name() const { return m_name; }
StringView name() const { return m_name ? m_name->view() : StringView {}; }
Region::Access access() const { return static_cast<Region::Access>(m_access); }
void set_name(String name) { m_name = move(name); }
void set_name(OwnPtr<KString> name) { m_name = move(name); }
const VMObject& vmobject() const { return *m_vmobject; }
VMObject& vmobject() { return *m_vmobject; }
@ -226,7 +226,7 @@ public:
void set_syscall_region(bool b) { m_syscall_region = b; }
private:
Region(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, String, Region::Access access, Cacheable, bool shared);
Region(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, OwnPtr<KString>, Region::Access access, Cacheable, bool shared);
bool do_remap_vmobject_page_range(size_t page_index, size_t page_count);
@ -254,7 +254,7 @@ private:
Range m_range;
size_t m_offset_in_vmobject { 0 };
NonnullRefPtr<VMObject> m_vmobject;
String m_name;
OwnPtr<KString> m_name;
u8 m_access { Region::None };
bool m_shared : 1 { false };
bool m_cacheable : 1 { false };