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Merge pull request #1870 from heapo/pagetable_shrink_to_fit

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Perf: Call shrink_to_fit after page-table vector resizing to actually reduce vector capacity
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Mat M 2018-12-05 18:36:47 -05:00 committed by GitHub
commit 4d3d2fcebd
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src/core/memory.cpp
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@ -53,6 +53,14 @@ void PageTable::Resize(std::size_t address_space_width_in_bits) {
pointers.resize(num_page_table_entries); pointers.resize(num_page_table_entries);
attributes.resize(num_page_table_entries); attributes.resize(num_page_table_entries);
// The default is a 39-bit address space, which causes an initial 1GB allocation size. If the
// vector size is subsequently decreased (via resize), the vector might not automatically
// actually reallocate/resize its underlying allocation, which wastes up to ~800 MB for
// 36-bit titles. Call shrink_to_fit to reduce capacity to what's actually in use.
pointers.shrink_to_fit();
attributes.shrink_to_fit();
} }
static void MapPages(PageTable& page_table, VAddr base, u64 size, u8* memory, PageType type) { static void MapPages(PageTable& page_table, VAddr base, u64 size, u8* memory, PageType type) {