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video_core: rasterizer_accelerated: Use a flat array instead of interval_map for cached pages.

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- Uses a fixed 64MB for the cache instead of an ever growing map.
- Slightly faster by using atomics instead of a single mutex for access.
- Thanks for Rodrigo for the idea.
This commit is contained in:
bunnei 2021-03-02 16:57:53 -08:00
parent cd25817938
commit 94da1e8a7e
2 changed files with 32 additions and 44 deletions
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51
src/video_core/rasterizer_accelerated.cpp
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@ -2,64 +2,39 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <mutex>
#include <boost/icl/interval_map.hpp>
#include <boost/range/iterator_range.hpp>
#include "common/assert.h"
#include "common/common_types.h"
#include "common/div_ceil.h"
#include "core/memory.h"
#include "video_core/rasterizer_accelerated.h"
namespace VideoCore {
namespace {
template <typename Map, typename Interval>
constexpr auto RangeFromInterval(Map& map, const Interval& interval) {
return boost::make_iterator_range(map.equal_range(interval));
}
} // Anonymous namespace
RasterizerAccelerated::RasterizerAccelerated(Core::Memory::Memory& cpu_memory_)
: cpu_memory{cpu_memory_} {}
RasterizerAccelerated::~RasterizerAccelerated() = default;
void RasterizerAccelerated::UpdatePagesCachedCount(VAddr addr, u64 size, int delta) {
std::lock_guard lock{pages_mutex};
const u64 page_start{addr >> Core::Memory::PAGE_BITS};
const u64 page_end{(addr + size + Core::Memory::PAGE_SIZE - 1) >> Core::Memory::PAGE_BITS};
const auto page_end = Common::DivCeil(addr + size, Core::Memory::PAGE_SIZE);
for (auto page = addr >> Core::Memory::PAGE_BITS; page != page_end; ++page) {
auto& count = cached_pages.at(page >> 3).Count(page);
// Interval maps will erase segments if count reaches 0, so if delta is negative we have to
// subtract after iterating
const auto pages_interval = CachedPageMap::interval_type::right_open(page_start, page_end);
if (delta > 0) {
cached_pages.add({pages_interval, delta});
}
ASSERT_MSG(count < UINT8_MAX, "Count may exceed UINT8_MAX!");
for (const auto& pair : RangeFromInterval(cached_pages, pages_interval)) {
const auto interval = pair.first & pages_interval;
const int count = pair.second;
count += delta;
const VAddr interval_start_addr = boost::icl::first(interval) << Core::Memory::PAGE_BITS;
const VAddr interval_end_addr = boost::icl::last_next(interval) << Core::Memory::PAGE_BITS;
const u64 interval_size = interval_end_addr - interval_start_addr;
if (delta > 0 && count == delta) {
cpu_memory.RasterizerMarkRegionCached(interval_start_addr, interval_size, true);
} else if (delta < 0 && count == -delta) {
cpu_memory.RasterizerMarkRegionCached(interval_start_addr, interval_size, false);
// Assume delta is either -1 or 1
if (count == 0) {
cpu_memory.RasterizerMarkRegionCached(page << Core::Memory::PAGE_BITS,
Core::Memory::PAGE_SIZE, false);
} else if (count == 1 && delta > 0) {
cpu_memory.RasterizerMarkRegionCached(page << Core::Memory::PAGE_BITS,
Core::Memory::PAGE_SIZE, true);
} else {
ASSERT(count >= 0);
}
}
if (delta < 0) {
cached_pages.add({pages_interval, delta});
}
}
} // namespace VideoCore

25
src/video_core/rasterizer_accelerated.h
View file

@ -4,9 +4,8 @@
#pragma once
#include <mutex>
#include <boost/icl/interval_map.hpp>
#include <array>
#include <atomic>
#include "common/common_types.h"
#include "video_core/rasterizer_interface.h"
@ -26,10 +25,24 @@ public:
void UpdatePagesCachedCount(VAddr addr, u64 size, int delta) override;
private:
using CachedPageMap = boost::icl::interval_map<u64, int>;
CachedPageMap cached_pages;
std::mutex pages_mutex;
class CacheEntry final {
public:
CacheEntry() = default;
std::atomic_uint8_t& Count(std::size_t page) {
return values[page & 7];
}
const std::atomic_uint8_t& Count(std::size_t page) const {
return values[page & 7];
}
private:
std::array<std::atomic_uint8_t, 8> values{};
};
static_assert(sizeof(CacheEntry) == 8, "CacheEntry should be 8 bytes!");
std::array<CacheEntry, 0x800000> cached_pages;
Core::Memory::Memory& cpu_memory;
};