1NODE_MAP_PFN_ALIGNME(9)   Memory Management in Linux   NODE_MAP_PFN_ALIGNME(9)
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NAME

6       node_map_pfn_alignment - determine the maximum internode alignment
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SYNOPSIS

9       unsigned long node_map_pfn_alignment(void);
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ARGUMENTS

12       void
13           no arguments
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DESCRIPTION

16       This function should be called after node map is populated and sorted.
17       It calculates the maximum power of two alignment which can distinguish
18       all the nodes.
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20       For example, if all nodes are 1GiB and aligned to 1GiB, the return
21       value would indicate 1GiB alignment with (1 << (30 - PAGE_SHIFT)). If
22       the nodes are shifted by 256MiB, 256MiB. Note that if only the last
23       node is shifted, 1GiB is enough and this function will indicate so.
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25       This is used to test whether pfn -> nid mapping of the chosen memory
26       model has fine enough granularity to avoid incorrect mapping for the
27       populated node map.
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29       Returns the determined alignment in pfn's. 0 if there is no alignment
30       requirement (single node).
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33Kernel Hackers Manual 3.10         June 2019           NODE_MAP_PFN_ALIGNME(9)
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