RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 20:57:44 +00:00
Code Issues Activity Actions

Kernel: Steer away from heap allocations for ProcFS process data

Browse source 
Instead, use more static patterns to acquire that sort of data.
This commit is contained in:
Liav A 2021-08-10 20:51:28 +03:00 • committed by Andreas Kling
parent bf1adc2d5d
commit 7ba991dc37
11 changed files with 991 additions and 879 deletions
Download patch file Download diff file Expand all files Collapse all files

128
Kernel/ProcessExposed.h
View file

@ -13,27 +13,49 @@
#include <AK/Types.h>
#include <Kernel/Arch/x86/CPU.h>
#include <Kernel/FileSystem/File.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/KBufferBuilder.h>
#include <Kernel/KResult.h>
#include <Kernel/Process.h>
#include <Kernel/UserOrKernelBuffer.h>
namespace Kernel {
namespace SegmentedProcFSIndex {
enum class MainProcessProperty {
Reserved = 0,
Unveil = 1,
Pledge = 2,
FileDescriptions = 3,
BinaryLink = 4,
CurrentWorkDirectoryLink = 5,
PerformanceEvents = 6,
VirtualMemoryStats = 7,
RootLink = 8,
};
enum class ProcessSubDirectory {
Reserved = 0,
FileDescriptions = 1,
Stacks = 2,
};
void read_segments(u32& primary, ProcessSubDirectory& sub_directory, MainProcessProperty& property);
InodeIndex build_segmented_index_for_pid_directory(ProcessID);
InodeIndex build_segmented_index_for_sub_directory(ProcessID, ProcessSubDirectory sub_directory);
InodeIndex build_segmented_index_for_main_property(ProcessID, ProcessSubDirectory sub_directory, MainProcessProperty property);
InodeIndex build_segmented_index_for_main_property_in_pid_directory(ProcessID, MainProcessProperty property);
InodeIndex build_segmented_index_for_thread_stack(ProcessID, ThreadID);
InodeIndex build_segmented_index_for_file_description(ProcessID, unsigned);
}
class ProcFSComponentRegistry {
public:
static ProcFSComponentRegistry& the();
static void initialize();
InodeIndex allocate_inode_index() const;
ProcFSComponentRegistry();
void register_new_process(Process&);
void unregister_process(Process&);
ProcFSRootDirectory& root_directory() { return *m_root_directory; }
Mutex& get_lock() { return m_lock; }
@ -64,13 +86,13 @@ public:
virtual NonnullRefPtr<Inode> to_inode(const ProcFS& procfs_instance) const;
InodeIndex component_index() const { return m_component_index; };
virtual InodeIndex component_index() const { return m_component_index; }
virtual ~ProcFSExposedComponent() = default;
protected:
ProcFSExposedComponent();
explicit ProcFSExposedComponent(StringView name);
ProcFSExposedComponent(StringView name, InodeIndex preallocated_index);
private:
OwnPtr<KString> m_name;
@ -80,7 +102,6 @@ private:
class ProcFSExposedDirectory
: public ProcFSExposedComponent
, public Weakable<ProcFSExposedDirectory> {
friend class ProcFSProcessDirectory;
friend class ProcFSComponentRegistry;
public:
@ -114,62 +135,24 @@ public:
protected:
virtual bool acquire_link(KBufferBuilder& builder) = 0;
explicit ProcFSExposedLink(StringView name);
ProcFSExposedLink(StringView name, InodeIndex preallocated_index);
mutable Mutex m_lock { "ProcFSLink" };
};
class ProcFSProcessDirectory final
: public ProcFSExposedDirectory {
friend class ProcFSComponentRegistry;
friend class ProcFSRootDirectory;
friend class ProcFSProcessInformation;
friend class ProcFSProcessPledge;
friend class ProcFSProcessUnveil;
friend class ProcFSProcessPerformanceEvents;
friend class ProcFSProcessFileDescription;
friend class ProcFSProcessFileDescriptions;
friend class ProcFSProcessOverallFileDescriptions;
friend class ProcFSProcessRoot;
friend class ProcFSProcessVirtualMemory;
friend class ProcFSProcessCurrentWorkDirectory;
friend class ProcFSProcessBinary;
friend class ProcFSProcessStacks;
public:
static NonnullRefPtr<ProcFSProcessDirectory> create(const Process&);
RefPtr<Process> associated_process() { return m_associated_process; }
virtual uid_t owner_user() const override { return m_associated_process ? m_associated_process->uid() : 0; }
virtual gid_t owner_group() const override { return m_associated_process ? m_associated_process->gid() : 0; }
virtual KResult refresh_data(FileDescription&) const override;
virtual RefPtr<ProcFSExposedComponent> lookup(StringView name) override;
virtual mode_t required_mode() const override { return 0500; }
virtual void prepare_for_deletion() override;
private:
void on_attach();
IntrusiveListNode<ProcFSProcessDirectory, RefPtr<ProcFSProcessDirectory>> m_list_node;
explicit ProcFSProcessDirectory(const Process&);
RefPtr<Process> m_associated_process;
};
class ProcFSRootDirectory final : public ProcFSExposedDirectory {
friend class ProcFSComponentRegistry;
public:
virtual RefPtr<ProcFSExposedComponent> lookup(StringView name) override;
RefPtr<ProcFSProcessDirectory> process_directory_for(Process&);
static NonnullRefPtr<ProcFSRootDirectory> must_create();
virtual ~ProcFSRootDirectory();
private:
virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const override;
ProcFSRootDirectory();
};
IntrusiveList<ProcFSProcessDirectory, RefPtr<ProcFSProcessDirectory>, &ProcFSProcessDirectory::m_list_node> m_process_directories;
struct ProcFSInodeData : public FileDescriptionData {
OwnPtr<KBuffer> buffer;
};
class ProcFSGlobalInformation : public ProcFSExposedComponent {
@ -208,47 +191,4 @@ protected:
}
};
class ProcFSProcessInformation : public ProcFSExposedComponent {
public:
virtual ~ProcFSProcessInformation() override {};
virtual KResultOr<size_t> read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, FileDescription* description) const override;
virtual uid_t owner_user() const override
{
auto parent_directory = m_parent_directory.strong_ref();
if (!parent_directory)
return false;
auto process = parent_directory->associated_process();
if (!process)
return false;
return process->uid();
}
virtual gid_t owner_group() const override
{
auto parent_directory = m_parent_directory.strong_ref();
if (!parent_directory)
return false;
auto process = parent_directory->associated_process();
if (!process)
return false;
return process->gid();
}
virtual mode_t required_mode() const override { return 0400; }
protected:
ProcFSProcessInformation(StringView name, const ProcFSProcessDirectory& process_directory)
: ProcFSExposedComponent(name)
, m_parent_directory(process_directory)
{
}
virtual KResult refresh_data(FileDescription&) const override;
virtual bool output(KBufferBuilder& builder) = 0;
WeakPtr<ProcFSProcessDirectory> m_parent_directory;
mutable Mutex m_refresh_lock;
};
}