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alignment with log2

This commit is contained in:
lizzie 2026-02-05 22:32:03 +00:00 committed by crueter
parent 9068e1f5d3
commit 90c3e25afd
1 changed files with 8 additions and 1 deletions
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9
src/common/fs/file.cpp
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@ -7,6 +7,7 @@
#include <vector>
#include "common/assert.h"
#include "common/bit_util.h"
#include "common/fs/file.h"
#include "common/fs/fs.h"
#ifdef ANDROID
@ -278,13 +279,19 @@ static int PlatformMapReadOnly(IOFile& io, const char* path) {
// a fun amount of fragmentation on the disk.
map_flags |= MAP_NOSYNC;
#endif
#ifdef MAP_ALIGNED_SUPER
#if defined(NDEBUG) && defined(MAP_NOCORE)
map_flags |= MAP_NOCORE;
#endif
#ifdef 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;