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lizzie 2026-04-29 21:04:29 +00:00
parent 9d8c21460b
commit da6b1d8edc
1 changed files with 4 additions and 7 deletions
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11
src/common/fs/file.cpp
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@ -283,19 +283,16 @@ static int PlatformMapReadOnly(IOFile& io, const char* path) {
#if defined(NDEBUG) && defined(MAP_NOCORE)
map_flags |= MAP_NOCORE;
#endif
#ifdef MAP_ALIGNED
#ifdef MAP_HUGE_2MB
map_flags |= MAP_HUGE_2MB; //2mb pages
#elif defined(MAP_ALIGNED)
// File must be big enough that it's worth to super align. We can't just super-align every
// file otherwise we will run out of alignments for actually important files :)
// System doesn't guarantee a super alignment, but if it's available it will delete
// about 3 layers(?) of the TLB tree for each read/write.
// Again the cost of faults may make this negligible gains, but hey, we gotta work
// what we gotta work with.
auto const align_log = Common::Log2Ceil64(u64(st.st_size));
map_flags |= align_log > 12 ? MAP_ALIGNED(align_log) : 0;
#elif defined(MAP_ALIGNED_SUPER)
using namespace Common::Literals;
u64 big_file_threshold = 512_MiB;
map_flags |= u64(st.st_size) >= big_file_threshold ? MAP_ALIGNED_SUPER : 0;
map_flags |= MAP_ALIGNED(21); //2^21 = 2mb use 2MB pages
#endif
io.mmap_base = (u8*)mmap(nullptr, io.mmap_size, PROT_READ, map_flags, io.mmap_fd, 0);
if (io.mmap_base == MAP_FAILED) {