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                                            Yangzheng Bai

pcstat syscall mincore failed with bad address if file is larger than 512MB on arm64 4K_PAGES machines

golang.org hardcode arm64 pagesize to 65536, which may not be correct golang.org/x/sys/unix/syscall_linux_arm64.go:func Getpagesize() int { return 65536 }

pcstat syscall mincore failed with bad address if file is larger than 512MB on arm64 4K_PAGES machines

golang 1.9 fixed page size problem, however, pcstat cannot be built under golang 1.9 (arm64)