It perf kmem support caller statistics for page. Unlike slab case,
the tracepoints in page allocator don't provide callsite info. So
it records with callchain and extracts callsite info.
Note that the callchain contains several memory allocation functions
which has no meaning for users. So
It perf kmem support caller statistics for page. Unlike slab case,
the tracepoints in page allocator don't provide callsite info. So
it records with callchain and extracts callsite info.
Note that the callchain contains several memory allocation functions
which has no meaning for users. So
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