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Use MAP_POPULATE only on Linux.

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This commit is contained in:
Alexander Kuzmenkov 2019-09-18 15:27:03 +03:00
parent 592b132b1a
commit e3a9863260
1 changed files with 5 additions and 0 deletions
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5
dbms/src/Common/Allocator.h
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@ -178,8 +178,13 @@ protected:
// hash tables, it makes sense to pre-fault the pages by passing
// MAP_POPULATE to mmap(). This takes some time, but should be faster
// overall than having a hot loop interrupted by page faults.
// It is only supported on Linux.
#if defined(__linux__)
static constexpr int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS
| (mmap_populate ? MAP_POPULATE : 0);
#else
static constexpr int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS;
#endif
private:
void * allocNoTrack(size_t size, size_t alignment)