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Kernel: Use the new on demand ELF structure

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All executable files are now read from disk and paged on demand.
This was a big rewrite of the old ELF library but in the end
everything seems much cleaner, since all the old functionality was
not actually needed for execution.

I have to do some measurements, but I feel like memory usage dropped
quite a bit after this change.
This commit is contained in:
Bananymous
2023-09-29 02:00:10 +03:00
parent 8357dd7b3d
commit a34f2e6e0d
3 changed files with 61 additions and 152 deletions
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18
kernel/include/kernel/Process.h
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@@ -16,7 +16,7 @@
#include <sys/mman.h>
#include <termios.h>
namespace LibELF { class ELF; }
namespace LibELF { class LoadableELF; }
namespace Kernel
{
@@ -150,11 +150,8 @@ namespace Kernel
Process(const Credentials&, pid_t pid, pid_t parent, pid_t sid, pid_t pgrp);
static Process* create_process(const Credentials&, pid_t parent, pid_t sid = 0, pid_t pgrp = 0);
// Load an elf file to virtual address space of the current page table
static BAN::ErrorOr<BAN::UniqPtr<LibELF::ELF>> load_elf_for_exec(const Credentials&, BAN::StringView file_path, const BAN::String& cwd);
// Copy an elf file from the current page table to the processes own
void load_elf_to_memory(LibELF::ELF&);
// Load elf from a file
static BAN::ErrorOr<BAN::UniqPtr<LibELF::LoadableELF>> load_elf_for_exec(const Credentials&, BAN::StringView file_path, const BAN::String& cwd, Kernel::PageTable&);
int block_until_exit();
@@ -172,17 +169,12 @@ namespace Kernel
int waiting { 0 };
};
struct MappedRange
{
bool can_be_unmapped;
BAN::UniqPtr<VirtualRange> range;
};
Credentials m_credentials;
OpenFileDescriptorSet m_open_file_descriptors;
BAN::Vector<MappedRange> m_mapped_ranges;
BAN::UniqPtr<LibELF::LoadableELF> m_loadable_elf;
BAN::Vector<BAN::UniqPtr<VirtualRange>> m_mapped_ranges;
pid_t m_sid;
pid_t m_pgrp;