Judging anonymous memory's vm_area_struct,
perf_mmap_event's filename will be set to
"//anon" indicating this vma is belong to
anonymous memory.
Once hugepage is used, vma's vm_file points
to hugetlbfs. In this way, this vma will not
be regarded as anonymous memory by is_anon_memory()
in perf user
Judging anonymous memory's vm_area_struct,
perf_mmap_event's filename will be set to
//anon indicating this vma is belong to
anonymous memory.
Once hugepage is used, vma's vm_file points
to hugetlbfs. In this way, this vma will not
be regarded as anonymous memory by is_anon_memory()
in perf user
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