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fsmitm_romfsbuild: optimize for data locality

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This commit is contained in:
Liam 2023-11-27 22:27:57 -05:00
parent 4bc932261b
commit 0751488727
5 changed files with 80 additions and 83 deletions
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130
src/core/file_sys/fsmitm_romfsbuild.cpp
View File

@ -2,6 +2,7 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <cstring>
#include <span>
#include <string_view>
#include "common/alignment.h"
#include "common/assert.h"
@ -134,7 +135,7 @@ void RomFSBuildContext::VisitDirectory(VirtualDir romfs_dir, VirtualDir ext_dir,
child->size = child->source->GetSize();
AddFile(parent, child);
AddFile(parent, std::move(child));
}
for (auto& child_romfs_dir : romfs_dir->GetSubdirectories()) {
@ -163,36 +164,24 @@ void RomFSBuildContext::VisitDirectory(VirtualDir romfs_dir, VirtualDir ext_dir,
bool RomFSBuildContext::AddDirectory(std::shared_ptr<RomFSBuildDirectoryContext> parent_dir_ctx,
std::shared_ptr<RomFSBuildDirectoryContext> dir_ctx) {
// Check whether it's already in the known directories.
const auto [it, is_new] = directories.emplace(dir_ctx->path, nullptr);
if (!is_new) {
return false;
}
// Add a new directory.
num_dirs++;
dir_table_size +=
sizeof(RomFSDirectoryEntry) + Common::AlignUp(dir_ctx->path_len - dir_ctx->cur_path_ofs, 4);
dir_ctx->parent = parent_dir_ctx;
it->second = dir_ctx;
dir_ctx->parent = std::move(parent_dir_ctx);
directories.emplace_back(std::move(dir_ctx));
return true;
}
bool RomFSBuildContext::AddFile(std::shared_ptr<RomFSBuildDirectoryContext> parent_dir_ctx,
std::shared_ptr<RomFSBuildFileContext> file_ctx) {
// Check whether it's already in the known files.
const auto [it, is_new] = files.emplace(file_ctx->path, nullptr);
if (!is_new) {
return false;
}
// Add a new file.
num_files++;
file_table_size +=
sizeof(RomFSFileEntry) + Common::AlignUp(file_ctx->path_len - file_ctx->cur_path_ofs, 4);
file_ctx->parent = parent_dir_ctx;
it->second = file_ctx;
file_ctx->parent = std::move(parent_dir_ctx);
files.emplace_back(std::move(file_ctx));
return true;
}
@ -201,7 +190,7 @@ RomFSBuildContext::RomFSBuildContext(VirtualDir base_, VirtualDir ext_)
: base(std::move(base_)), ext(std::move(ext_)) {
root = std::make_shared<RomFSBuildDirectoryContext>();
root->path = "\0";
directories.emplace(root->path, root);
directories.emplace_back(root);
num_dirs = 1;
dir_table_size = 0x18;
@ -210,28 +199,43 @@ RomFSBuildContext::RomFSBuildContext(VirtualDir base_, VirtualDir ext_)
RomFSBuildContext::~RomFSBuildContext() = default;
std::multimap<u64, VirtualFile> RomFSBuildContext::Build() {
std::vector<std::pair<u64, VirtualFile>> RomFSBuildContext::Build() {
const u64 dir_hash_table_entry_count = romfs_get_hash_table_count(num_dirs);
const u64 file_hash_table_entry_count = romfs_get_hash_table_count(num_files);
dir_hash_table_size = 4 * dir_hash_table_entry_count;
file_hash_table_size = 4 * file_hash_table_entry_count;
// Assign metadata pointers
// Assign metadata pointers.
RomFSHeader header{};
std::vector<u32> dir_hash_table(dir_hash_table_entry_count, ROMFS_ENTRY_EMPTY);
std::vector<u32> file_hash_table(file_hash_table_entry_count, ROMFS_ENTRY_EMPTY);
std::vector<u8> metadata(file_hash_table_size + file_table_size + dir_hash_table_size +
dir_table_size);
u32* const dir_hash_table_pointer = reinterpret_cast<u32*>(metadata.data());
u8* const dir_table_pointer = metadata.data() + dir_hash_table_size;
u32* const file_hash_table_pointer =
reinterpret_cast<u32*>(metadata.data() + dir_hash_table_size + dir_table_size);
u8* const file_table_pointer =
metadata.data() + dir_hash_table_size + dir_table_size + file_hash_table_size;
std::vector<u8> dir_table(dir_table_size);
std::vector<u8> file_table(file_table_size);
std::span<u32> dir_hash_table(dir_hash_table_pointer, dir_hash_table_entry_count);
std::span<u32> file_hash_table(file_hash_table_pointer, file_hash_table_entry_count);
std::span<u8> dir_table(dir_table_pointer, dir_table_size);
std::span<u8> file_table(file_table_pointer, file_table_size);
std::shared_ptr<RomFSBuildFileContext> cur_file;
// Initialize hash tables.
std::memset(dir_hash_table.data(), 0xFF, dir_hash_table.size_bytes());
std::memset(file_hash_table.data(), 0xFF, file_hash_table.size_bytes());
// Sort tables by name.
std::sort(files.begin(), files.end(),
[](const auto& a, const auto& b) { return a->path < b->path; });
std::sort(directories.begin(), directories.end(),
[](const auto& a, const auto& b) { return a->path < b->path; });
// Determine file offsets.
u32 entry_offset = 0;
std::shared_ptr<RomFSBuildFileContext> prev_file = nullptr;
for (const auto& it : files) {
cur_file = it.second;
for (const auto& cur_file : files) {
file_partition_size = Common::AlignUp(file_partition_size, 16);
cur_file->offset = file_partition_size;
file_partition_size += cur_file->size;
@ -243,34 +247,48 @@ std::multimap<u64, VirtualFile> RomFSBuildContext::Build() {
}
// Assign deferred parent/sibling ownership.
for (auto it = files.rbegin(); it != files.rend(); ++it) {
cur_file = it->second;
auto& cur_file = *it;
cur_file->sibling = cur_file->parent->file;
cur_file->parent->file = cur_file;
}
std::shared_ptr<RomFSBuildDirectoryContext> cur_dir;
// Determine directory offsets.
entry_offset = 0;
for (const auto& it : directories) {
cur_dir = it.second;
for (const auto& cur_dir : directories) {
cur_dir->entry_offset = entry_offset;
entry_offset +=
static_cast<u32>(sizeof(RomFSDirectoryEntry) +
Common::AlignUp(cur_dir->path_len - cur_dir->cur_path_ofs, 4));
}
// Assign deferred parent/sibling ownership.
for (auto it = directories.rbegin(); it->second != root; ++it) {
cur_dir = it->second;
for (auto it = directories.rbegin(); (*it) != root; ++it) {
auto& cur_dir = *it;
cur_dir->sibling = cur_dir->parent->child;
cur_dir->parent->child = cur_dir;
}
std::multimap<u64, VirtualFile> out;
// Create output map.
std::vector<std::pair<u64, VirtualFile>> out;
out.reserve(num_files + 2);
// Set header fields.
header.header_size = sizeof(RomFSHeader);
header.file_hash_table_size = file_hash_table_size;
header.file_table_size = file_table_size;
header.dir_hash_table_size = dir_hash_table_size;
header.dir_table_size = dir_table_size;
header.file_partition_ofs = ROMFS_FILEPARTITION_OFS;
header.dir_hash_table_ofs = Common::AlignUp(header.file_partition_ofs + file_partition_size, 4);
header.dir_table_ofs = header.dir_hash_table_ofs + header.dir_hash_table_size;
header.file_hash_table_ofs = header.dir_table_ofs + header.dir_table_size;
header.file_table_ofs = header.file_hash_table_ofs + header.file_hash_table_size;
std::vector<u8> header_data(sizeof(RomFSHeader));
std::memcpy(header_data.data(), &header, header_data.size());
out.emplace_back(0, std::make_shared<VectorVfsFile>(std::move(header_data)));
// Populate file tables.
for (const auto& it : files) {
cur_file = it.second;
for (const auto& cur_file : files) {
RomFSFileEntry cur_entry{};
cur_entry.parent = cur_file->parent->entry_offset;
@ -287,7 +305,7 @@ std::multimap<u64, VirtualFile> RomFSBuildContext::Build() {
cur_entry.name_size = name_size;
out.emplace(cur_file->offset + ROMFS_FILEPARTITION_OFS, std::move(cur_file->source));
out.emplace_back(cur_file->offset + ROMFS_FILEPARTITION_OFS, std::move(cur_file->source));
std::memcpy(file_table.data() + cur_file->entry_offset, &cur_entry, sizeof(RomFSFileEntry));
std::memset(file_table.data() + cur_file->entry_offset + sizeof(RomFSFileEntry), 0,
Common::AlignUp(cur_entry.name_size, 4));
@ -296,8 +314,7 @@ std::multimap<u64, VirtualFile> RomFSBuildContext::Build() {
}
// Populate dir tables.
for (const auto& it : directories) {
cur_dir = it.second;
for (const auto& cur_dir : directories) {
RomFSDirectoryEntry cur_entry{};
cur_entry.parent = cur_dir == root ? 0 : cur_dir->parent->entry_offset;
@ -323,34 +340,13 @@ std::multimap<u64, VirtualFile> RomFSBuildContext::Build() {
cur_dir->path.data() + cur_dir->cur_path_ofs, name_size);
}
// Set header fields.
header.header_size = sizeof(RomFSHeader);
header.file_hash_table_size = file_hash_table_size;
header.file_table_size = file_table_size;
header.dir_hash_table_size = dir_hash_table_size;
header.dir_table_size = dir_table_size;
header.file_partition_ofs = ROMFS_FILEPARTITION_OFS;
header.dir_hash_table_ofs = Common::AlignUp(header.file_partition_ofs + file_partition_size, 4);
header.dir_table_ofs = header.dir_hash_table_ofs + header.dir_hash_table_size;
header.file_hash_table_ofs = header.dir_table_ofs + header.dir_table_size;
header.file_table_ofs = header.file_hash_table_ofs + header.file_hash_table_size;
// Write metadata.
out.emplace_back(header.dir_hash_table_ofs,
std::make_shared<VectorVfsFile>(std::move(metadata)));
std::vector<u8> header_data(sizeof(RomFSHeader));
std::memcpy(header_data.data(), &header, header_data.size());
out.emplace(0, std::make_shared<VectorVfsFile>(std::move(header_data)));
std::vector<u8> metadata(file_hash_table_size + file_table_size + dir_hash_table_size +
dir_table_size);
std::size_t index = 0;
std::memcpy(metadata.data(), dir_hash_table.data(), dir_hash_table.size() * sizeof(u32));
index += dir_hash_table.size() * sizeof(u32);
std::memcpy(metadata.data() + index, dir_table.data(), dir_table.size());
index += dir_table.size();
std::memcpy(metadata.data() + index, file_hash_table.data(),
file_hash_table.size() * sizeof(u32));
index += file_hash_table.size() * sizeof(u32);
std::memcpy(metadata.data() + index, file_table.data(), file_table.size());
out.emplace(header.dir_hash_table_ofs, std::make_shared<VectorVfsFile>(std::move(metadata)));
// Sort the output.
std::sort(out.begin(), out.end(),
[](const auto& a, const auto& b) { return a.first < b.first; });
return out;
}

6
src/core/file_sys/fsmitm_romfsbuild.h
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@ -22,14 +22,14 @@ public:
~RomFSBuildContext();
// This finalizes the context.
std::multimap<u64, VirtualFile> Build();
std::vector<std::pair<u64, VirtualFile>> Build();
private:
VirtualDir base;
VirtualDir ext;
std::shared_ptr<RomFSBuildDirectoryContext> root;
std::map<std::string, std::shared_ptr<RomFSBuildDirectoryContext>, std::less<>> directories;
std::map<std::string, std::shared_ptr<RomFSBuildFileContext>, std::less<>> files;
std::vector<std::shared_ptr<RomFSBuildDirectoryContext>> directories;
std::vector<std::shared_ptr<RomFSBuildFileContext>> files;
u64 num_dirs = 0;
u64 num_files = 0;
u64 dir_table_size = 0;

4
src/core/file_sys/vfs_concat.cpp
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@ -59,8 +59,8 @@ VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(std::string&& name,
return VirtualFile(new ConcatenatedVfsFile(std::move(name), std::move(concatenation_map)));
}
VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(u8 filler_byte, std::string&& name,
std::multimap<u64, VirtualFile>&& files) {
VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(
u8 filler_byte, std::string&& name, std::vector<std::pair<u64, VirtualFile>>&& files) {
// Fold trivial cases.
if (files.empty()) {
return nullptr;

2
src/core/file_sys/vfs_concat.h
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@ -37,7 +37,7 @@ public:
/// Convenience function that turns a map of offsets to files into a concatenated file, filling
/// gaps with a given filler byte.
static VirtualFile MakeConcatenatedFile(u8 filler_byte, std::string&& name,
std::multimap<u64, VirtualFile>&& files);
std::vector<std::pair<u64, VirtualFile>>&& files);
std::string GetName() const override;
std::size_t GetSize() const override;

21
src/core/file_sys/vfs_layered.cpp
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@ -3,6 +3,7 @@
#include <algorithm>
#include <set>
#include <unordered_set>
#include <utility>
#include "core/file_sys/vfs_layered.h"
@ -59,13 +60,12 @@ std::string LayeredVfsDirectory::GetFullPath() const {
std::vector<VirtualFile> LayeredVfsDirectory::GetFiles() const {
std::vector<VirtualFile> out;
std::set<std::string, std::less<>> out_names;
std::unordered_set<std::string> out_names;
for (const auto& layer : dirs) {
for (auto& file : layer->GetFiles()) {
auto file_name = file->GetName();
if (!out_names.contains(file_name)) {
out_names.emplace(std::move(file_name));
const auto [it, is_new] = out_names.emplace(file->GetName());
if (is_new) {
out.emplace_back(std::move(file));
}
}
@ -75,18 +75,19 @@ std::vector<VirtualFile> LayeredVfsDirectory::GetFiles() const {
}
std::vector<VirtualDir> LayeredVfsDirectory::GetSubdirectories() const {
std::vector<std::string> names;
std::vector<VirtualDir> out;
std::unordered_set<std::string> out_names;
for (const auto& layer : dirs) {
for (const auto& sd : layer->GetSubdirectories()) {
if (std::find(names.begin(), names.end(), sd->GetName()) == names.end())
names.push_back(sd->GetName());
out_names.emplace(sd->GetName());
}
}
std::vector<VirtualDir> out;
out.reserve(names.size());
for (const auto& subdir : names)
out.reserve(out_names.size());
for (const auto& subdir : out_names) {
out.emplace_back(GetSubdirectory(subdir));
}
return out;
}